- Enhanced activity of CuO/ZnO catalyst on the decomposition of dimethylhexane-1,6-dicarbamate into dimethylhexane-1,6-diisocyanate
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To decompose dimethylhexane-1,6-dicarbamate (HDC) to hexamethylene diisocyanate (HDI), mixed CuO and ZnO catalysts with Cu/(Cu + Zn) ratio of 4 and 8% were prepared by coprecipitation (CP), sequential precipitation (SP) and incipient wetness impregnation (IW). The SP-derived CuO/ZnO catalysts showed higher HDC yields than those derived by CP and IW. The IW method produced CuO/ZnO catalysts consisting of larger CuO and ZnO particles compared to the two precipitation methods. The CP method led to substitution of Zn2+ by Cu2+ in the hydrozincite precursor phase, resulting in higher BET and Cu surface areas of CuO–ZnO catalysts due to intimate intergrowth of nano-sized particles. However, the inherent character of ZnO in the CP-derived catalysts was modified by interfacial contact between CuO and ZnO identified by UV–visible and Raman spectra. In contrast, the properties of CuO and ZnO, as well as the relatively large surface areas, were kept in the SP-derived catalysts owing to deposition of Cu precipitates to fully aged Zn precipitates. This is believed to be a benefit of the SP method for the reaction. Therefore, our preparation approach has great potential to be extended to various mixed oxide catalysts.
- Kim, Jinsung,Jeong, Cheonwoo,Lee, Jae-Hong,Suh, Young-Woong
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-
Read Online
- Synthesis of isocyanates from carboxylic acids using diphenylphosphoryl azide and 1,8-bis(dimethylamino)naphthalene
-
A simple phosgene-free method for the synthesis of high-purity isocyanates from carboxylic acids was developed using diphenylphosphoryl azide and 1,8-bis(dimethylamino)naphthalene. Yields for evaluated monoisocyanates ranged from 60.0% to 81.5%.
- Gilman,Otonari
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-
Read Online
- METHOD FOR PRODUCING CARBAMATE AND METHOD FOR PRODUCING ISOCYANATE
-
The present invention provides a method for producing a carbamate that includes a step (1) and a step (2) described below: (1) a step of producing a compound (A) having a urea linkage, using an organic primary amine having at least one primary amino group per molecule and at least one compound selected from among carbon dioxide and carbonic acid derivatives, at a temperature lower than the thermal dissociation temperature of the urea linkage; and(2) a step of reacting the compound (A) with a carbonate ester to produce a carbamate.
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- Method for preparing isocyanate with low hydrolytic chlorine content by gas phase method
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The invention relates to a method for preparing isocyanate with low hydrolytic chlorine content by a gas phase method, which comprises the following steps of: carrying out phosgenation reaction on corresponding amine and stoichiometric excess phosgene in a reaction zone in the presence or absence of an inert medium; wherein the reaction conditions are selected such that at least the reaction components amine, isocyanate and phosgene are gaseous under these conditions, and feeding of at least one gas stream comprising amine and at least one gas stream comprising phosgene into the reaction zone, and introducing of a carbon dioxide stream in a quenching zone at the rear end of the reaction zone are carried out, and the molar content of the carbon dioxide stream is less than 60% of the molar weight of the phosgene stream, so that the isocyanate with low hydrolytic chlorine content can be obtained more easily, the product yield is improved, and the investment cost of the device is reduced.
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Paragraph 0033-0036; 0041-0046
(2021/05/22)
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- Method for manufacturing pentamethylene diisocyanate
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The present invention provides a method for manufacturing pentamethylene diisocyanate. The method for manufacturing pentamethylene diisocyanate of the present invention manufactures intermediates by using dialkyl carbonate. By thermally decomposing the intermediates under a specific polymerization inhibitor, the method can manufacture the pentamethylene diisocyanate having excellent purity in a high yield.
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Paragraph 0064-0065; 0066-0067
(2021/05/11)
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- METHOD OF PREPARING DIISOCYANATE COMPOSITION
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In the embodiments, an aqueous hydrochloric acid solution instead of hydrogen chloride gas and solid triphosgene instead of phosgene gas may be used in the process of preparing a diisocyanate from a diamine through a diamine hydrochloride. In addition, the embodiments provide processes for preparing a diisocyanate composition and an optical lens, which are excellent in yield and quality with mitigated environmental problems by controlling the size of the diamine hydrochloride composition, the b* value according to the CIE color coordinate of the diamine hydrochloride composition, or the content of water in the diamine hydrochloride composition within a specific range.
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Paragraph 0248-0249; 0283-0285
(2021/06/11)
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- METHOD OF PREPARING DIISOCYANATE COMPOSITION AND OPTICAL LENS
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In the embodiments, an aqueous hydrochloric acid solution and an organic solvent instead of hydrogen chloride gas and solid triphosgene instead of phosgene gas may be used in the process of preparing a diisocyanate from a diamine through a diamine hydrochloride. In addition, the embodiments provide processes for preparing a diisocyanate composition and an optical lens, which are excellent in yield and quality with mitigated environmental problems by controlling the total content of metals, cations, or anions in a diamine hydrochloride composition.
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Paragraph 0235-0238; 0243; 0290
(2021/06/11)
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- Method for preparing low-chlorinated impurity content isocyanate based on salt formation light gasification (by machine translation)
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The invention provides a method for preparing low-chlorinated impurity content isocyanate based on a salt-formation light gasification method. The proportion of the salt particle size distribution obtained by the salt formation reaction in the average particle size ±30% range is 70% or more, the average residence time without stirring is less than 60 min, and the product obtained by the method has lower chlorinated impurity content. (by machine translation)
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Paragraph 0069-0070; 0082-0083
(2020/10/14)
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- ISOCYANATE PRODUCTION METHOD
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An isocyanate production method according to the present invention is a method in which an isocyanate is produced by subjecting a carbamate to thermal decomposition, and includes: a step of preparing a mixture liquid containing the carbamate, an inactive solvent and a polyisocyanate compound; a step of conducting a thermal decomposition reaction of the carbamate by continuously introducing the mixture liquid into a thermal decomposition reactor; a step of collecting a low-boiling decomposition product by continuously extracting the low-boiling decomposition product in a gaseous state from the reactor, the low-boiling decomposition product having a boiling point lower than the polyisocyanate compound; and a step of collecting a high-boiling component by continuously extracting, from the reactor, a liquid phase component which is not collected in a gaseous state at the step of collecting the low-boiling decomposition product.
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Paragraph 0419-0428; 0430; 0447-0449; 0454-0457; 0462-0466
(2020/05/02)
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- PROCESS FOR THE PREPARATION OF ISOCYANATES
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The invention relates to a process for the preparation of aliphatic, cycloaliphatic or araliphatic isocyanates by reacting at least one primary organic amine with a stoichiometric excess of phosgene in the gas phase, comprising the steps a) reaction of the primary organic amine with an excess of phosgene in the gas phase and quenching the process product with a liquid comprising an inert aromatic solvent to obtain a liquid stream containing the isocyanate and a gas stream containing HCl and phosgene, b) separation of the gas stream containing HCl and phosgene obtained in step a) into a gas stream containing HCl and a liquid stream containing phosgene, c) partial vaporization of the liquid stream containing phosgene obtained in step b) to produce a gas stream containing phosgene, d) the gas stream containing phosgene obtained in step c) is at least partially recycled into the reaction in step a), and wherein the gas stream containing phosgene obtained in step c) contains 0.5 wt% or less of the sum of benzene, chlorobenzene and dichlorobenzene. The invention additionally relates to an isocyanate composition.
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Page/Page column 23
(2019/08/12)
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- MULTISTEP PROCESS FOR THE PREPARATION OF HEXAMETHYLENE DIISOCYANATE, PENTAMETHYLENE DIISOCYANATE OR TOLUENE DIISOCYANATE
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The present invention relates to a multistep process for the preparation of organic diisocyanates by converting the corresponding diamine precursors, urea and hydroxy compounds into monomeric diurethanes, converting these diurethanes into diurethanes of high boiling hydroxy compounds, and finally cleavage of the latter diurethanes to form the diisocyanates and recover the high boiling hydroxy compounds.
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- METHOD FOR PRODUCING ISOCYANATE
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PROBLEM TO BE SOLVED: To provide a method for producing isocyanate that suppresses a side reaction and continuously produces isocyanate. SOLUTION: The present invention provides a method for producing isocyanate by pyrolysis of carbamate, the method including: a pyrolysis step in which a liquid mixture containing carbamate and a chain or cyclic aliphatic hydrocarbon having carbon atoms of 9 or more and 35 or less is continuously introduced into a pyrolytic reactor for a pyrolytic reaction of carbamate; a low-boiling-point pyrolytic product recovery step in which a low-boiling-point pyrolytic product having a normal boiling point lower than that of the aliphatic hydrocarbon is continuously extracted in a gas state from the pyrolytic reactor; and a high-boiling-point component recovery step in which a liquid phase component, which has not been recovered in a gas state in the low-boiling-point pyrolytic product recovery step, is continuously extracted as a high-boiling-point component from the pyrolytic reactor. SELECTED DRAWING: None COPYRIGHT: (C)2020,JPO&INPIT
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Paragraph 0131-0132; 0135-0136
(2020/01/09)
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- METHOD FOR PRODUCING ISOCYANATE
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PROBLEM TO BE SOLVED: To provide a method for producing isocyanate that suppresses a side reaction and continuously produces isocyanate. SOLUTION: The present invention provides a method for producing isocyanate by pyrolysis of carbamate, the method including: a pyrolysis step in which a liquid mixture containing carbamate and a compound (X) of a specific structure is continuously introduced into a pyrolytic reactor for a pyrolytic reaction of carbamate; a low-boiling-point pyrolytic product recovery step in which a low-boiling-point pyrolytic product having a normal boiling point lower than that of the compound (X) is continuously extracted in a gas state from the pyrolytic reactor; and a high-boiling-point component recovery step in which a liquid phase component, which has not been recovered in a gas state in the low-boiling-point pyrolytic product recovery step, is continuously extracted as a high-boiling-point component from the pyrolytic reactor. SELECTED DRAWING: None COPYRIGHT: (C)2020,JPOandINPIT
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Paragraph 0209-0210; 0214-0216
(2020/01/09)
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- PRODUCTION METHOD OF ISOCYANATE
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PROBLEM TO BE SOLVED: To provide a production method of isocyanate for producing isocyanate continuously by suppressing a side reaction. SOLUTION: A production method of isocyanate is a method for producing isocyanate by pyrolysis of carbamate. The method includes a pyrolysis process for performing a pyrolysis reaction of carbamate by introducing continuously a mixed liquid containing carbamate and a compound (A) having a specific structure into a pyrolysis reactor, a low-boiling point decomposition product recovery process for extracting, continuously from the pyrolysis reactor in a gas phase, a low-boiling point decomposition product having a lower normal boiling point than the compound (A), and a high-boiling point component recovery process for extracting, continuously from the pyrolysis reactor as a high-boiling point component, a liquid phase component not recovered in the gas phase in the low-boiling point decomposition product recovery process. SELECTED DRAWING: None COPYRIGHT: (C)2020,JPOandINPIT
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Paragraph 0161; 0163; 0167; 0168
(2020/02/14)
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- Process for the preperation of Aliphatic Diisocyanates
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The present invention relates to a process for preparing aliphatic diisocyanate, and more particularly, to a process for preparing aliphatic diisocyanate in which aliphatic dicarbamate is thermo-decomposed in the presence of a catalyst of a tin compound, and by-products having a high boiling point produced using a reaction system composed of a heat exchanger for removing a high boiling point material and a centrifuge is efficiently removed, thereby improving the yield of diisocyanate.
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Paragraph 0048-0086
(2019/07/09)
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- Method for Preparing Aliphatic Diisocyanates
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The present invention relates to a method for preparing aliphatic diisocyanates, and more specifically, to a method for preparing high-yield aliphatic diisocyanates, suppressing production of polymer by-products compared to a method for manufacturing aliphatic diisocyanates by pyrolyzing aliphatic dicarbamates without catalysts, by pyrolyzing aliphatic dicarbamate in the presence of vanadia catalysts.
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Paragraph 0034-0066
(2019/10/16)
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- Method for Preparing Aliphatic Diisocyanates
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The present invention relates to a method for preparing aliphatic diisocyanates, and more specifically, to a method for preparing aliphatic diisocyanates by pyrolyzing aliphatic dicarbamate in the presence of a catalyst of a tin compound by using each reactor composed of one or more secondary reactors connected to a primary reactor, while adjusting the speed of pyrolysis through an adjustment of pyrolysis condition and catalyst contents, thereby suppressing a formation of byproducts with a high boiling point and accordingly increasing the yield of diisocyanates.
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Paragraph 0056-0096
(2019/11/29)
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- N - substituted carbamic acid ester
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PROBLEM TO BE SOLVED: To provide a method of manufacturing N-substituted carbamate ester with a high yield, a high purity and high efficiency (in a short time) without generation of byproducts.SOLUTION: A method of manufacturing N-substituted carbamate ester from an organic amine, urea and an aromatic hydroxy compound includes a process of supplying a composition containing a carbonic acid derivative and the aromatic hydroxy compound to a bottom part of a reaction apparatus where a synthetic reaction of the N-substituted carbamate ester occurs.
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Paragraph 0097; 0098
(2017/08/29)
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- Preparation method of HDI (hexamethylene diisocyanate)
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The invention discloses a preparation method of HDI (hexamethylene diisocyanate). The preparation method comprises steps as follows: n-hexamethylene diamine is dissolved in an organic solvent, acidic gas is introduced for salt formation, an HDI solution is obtained through a phosgenation reaction under the action of a catalyst, distillation desolvation and rectification are performed, and high-purity HDI is obtained. HDI is prepared with the salt formation method, and the defect of high probability of side reactions at the low-temperature section with a cold and hot two-step reaction method is avoided; besides, the catalyst is added, the reaction temperature is reduced, the reaction speed is increased, the phosgenation reaction is performed through gradient temperature increasing, the defects that side reactions are easily produced because of too high temperature and the reaction time is too long because of too low temperature during phosgenation with a conventional salt formation method are overcome, the production cycle is shortened, high-purity HDI can also be obtained, besides, trimethylamine is added during rectification, and the content of free chlorine in a product can be effectively reduced.
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Paragraph 0024; 0025; 0028; 0029
(2017/03/25)
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- TWO-STEP AND ONE-POT PROCESSES FOR PREPARATION OF ALIPHATIC DIISOCYANATES
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The present invention relates to using a two-step (thermolysis) or one-pot process to prepare aliphatic diisocyanates from aliphatic diamines and diaryl carbonates. Polyisocyanates can also be prepared from polyamines and diaryl carbonates. The present synthetic processes do not apply phosgene or highly toxic reagents and chloro-solvents during the entire procedure.
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Paragraph 0123-0124; 0125
(2017/02/02)
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- A other fields is multifunctional synergistic antioxidant stabilizer preparation method
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The invention relates to a method for preparing a urea bonded multifunctional synergic anti-oxidation stabilizer. The method comprises the following steps: (1) adding organic amine into dried dichloromethane or methylbenzene of trichloromethyl carbonate at zero DEG C, dripping Net3, washing of organic alkali by using a hydrochloric acid solution after the reaction is completed, drying the organic phase, concentrating, performing chromatographic purification, thereby obtaining an expected midbody, or concentrating for a next step of reaction directly; (2) dissolving isocyanate in a solvent such as dried dichloromethane or methylbenzene to be added into 2,6-ditertiary butyl p-cresol or added into reactant such as 4-amino-2,2,6,6-tertmethyl piperidine when being stirred, concentrating in vacuum after the reaction is completed, and purifying, thereby obtaining a product. The anti-oxidation stabilizer provided by the invention has the characteristics of stably bonded multifunctional hybridization synergic property, heat resistance, light resistance, high-temperature processing resistance, hydrolysis resistance, acid/alkali resistance, rusting corrosion resistance and the like, the characteristics make up the defects of similar products in the market, and basis is made for the development of novel effective anti-oxidation stabilizers.
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Paragraph 0050- 0054
(2017/08/02)
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- Zn-Co bimetallic supported ZSM-5 catalyst for phosgene-free synthesis of hexamethylene–1,6–diisocyanate by thermal decomposition of hexamethylene–1,6–dicarbamate
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A set of mono- and bimetallic (Zn-Co) supported ZSM-5 catalysts was first prepared by PEG-additive method. The physicochemical properties of the catalysts were investigated by FTIR, XPS, XRD, N2 adsorption-desorption measurements, SEM, EDS and NH3-TPD techniques. The physicochemical properties showed that the ZnCo2O4 spinel oxide was formed on the ZSM-5 support and provided effectual synergetic effect between Zn and Co species for the bimetallic catalyst. Furthermore, bimetallic supported ZSM-5 catalyst exhibited weak, moderate and strong acidic sites, while the monometallic supported ZSM-5 catalyst showed only weak and moderate or strong acidic sites. Their catalytic performances for thermal decomposition of hexamethylene–1,6–dicarbamate (HDC) to hexamethylene–1,6–diisocyanate (HDI) were then studied. It was found that the bimetallic supported ZSM-5 catalysts, especially Zn-2Co/ZSM-5 catalyst showed excellent catalytic performance due to the good synergetic effect between Co and Zn species, which provided a suitable contribution of acidic sites. HDC conversion of 100% with HDI selectivity of 91.2% and by-products selectivity of 1.3% could be achieved within short reaction time of 2.5?h over Zn-2Co/ZSM-5 catalyst.
- Ammar, Muhammad,Cao, Yan,He, Peng,Wang, Li-Guo,Chen, Jia-Qiang,Li, Hui-Quan
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p. 1583 - 1589
(2017/07/17)
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- A process for preparing color-stable 1,6-hexane diisocyanate
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The invention relates to a method for preparing 1,6-hexamethylene diisocyanate stable in color. According to the method, low-boiling point components, namely, tetrahydroazepine, 1-amino-2-cyano-1-cyclopentene and 1,6-hexamethylenediamine with 6-amino-capronitrile content less than or equal to 50mg/kg as raw materials and gaseous-phase phosgenation reaction is carried, so that the obtained 1,6-hexamethylene diisocyanate has favorable color stability.
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Paragraph 0036-0037
(2017/01/19)
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- A pressuring pyrolysis the preparation of isocyanates apparatus and method
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The invention relates to equipment and a method for preparing isocyanate through compression pyrolysis, and belongs to the technical field of preparation of isocyanate through pyrolysis. The reactor is an integrated reactor of a high pressure pyrolytic reaction kettle and a rectifying tower and comprises a pyrolytic reaction kettle and a rectifying tower; a gas rising pipeline and a liquid return pipeline are connected between the pyrolytic reaction kettle and the rectifying tower; a condenser is arranged on the upper part of the rectifying tower; liquid in the condenser can reflow by inner circulation or outer circulation; a gas outlet is arranged on the upper part for connecting a pressure adjusting system to keep the pressure of the system; and the pyrolytic reaction kettle is simultaneously connected with a liquid phase output discharge processing system. Under the compression pyrolysis condition, solvent can be effectively separated from lower alcohol generated from reaction in the reaction process through separation of the rectifying tower, so that the reaction rate is improved, and the yield of isocyanate is enhanced.
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Paragraph 0043-0045
(2017/03/28)
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- A urea key connecting multifunctional synergistic antioxidant stabilizer and its preparation method and application
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The invention relates to a urea bonded multifunctional synergic anti-oxidation stabilizer as well as a preparation method and application thereof. The urea bonded multifunctional synergic anti-oxidation stabilizer has the structure as shown in the description. In the formula, R1 is a connecting bond, the connecting bond is an aliphatic chain, an aromatic structure chain or a mixed aliphatic and aromatic structure chain, R2 is a structure fragment of H, compounds as shown in the description, phenols, steric hindrance amino, thioether or phosphite ester; R, R3 and R4 are all aliphatic chains, aliphatic chains with heteroatoms, or Ar or aromatic-aliphatic mixed chains; X is O, NH or S; n is 1 or other positive integers. The anti-oxidation stabilizer provided by the invention has the characteristics of stably bonded multifunctional hybridization synergic property, heat resistance, light resistance, high-temperature processing resistance, hydrolysis resistance, acid/alkali resistance, rusting corrosion resistance and the like and has the advantage of specific structure stability, the characteristics make up the defects of similar products in the market, and basis is made for the development of novel effective anti-oxidation stabilizers.
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Paragraph 0058; 0059; 0060; 0061
(2016/10/09)
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- Synthesis of HDI method
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A method for synthesizing HDI relates to the technical field of chemical synthesis. The method of the invention uses 1, 6-hexamethylene diamine ( HDA ) and phosgene as raw materials, aromatic mono-isocyanate as a catalyst and aromatic hydrocarbon as an inert solvent, and caries out low temperature and high temperature two stage reaction to prepare an HDI mixed liquor; the mixed liquor then is distilled to remove aromatic mono-isocyanate and aromatic hydrocarbon to obtain the HDI. The method, utilizing aromatic mono-isocyanate catalyst to prepare HDI, of the invention has the advantages of simple operation, mild condition, easy separation, easy recycling and high yield. The aromatic mono-isocyanate catalyst used by the method has wide source and low price, and is easy for separation and recycling, and compared to the known catalysts, the aromatic mono-isocyanate catalyst overcomes problems of tar generation in a recovery process and low product yield, and has obvious advantage for industrial application.
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Paragraph 0054; 0056; 0057; 0058
(2016/10/07)
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- Phosgene-free decomposition of dimethylhexane-1,6-dicarbamate over ZnO
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In catalytic decomposition of dimethylhexane-1,6-dicarbamate (HDC) into hexamethylene-1,6-diisocyanate (HDI), Zn-containing homogeneous (i.e., zinc acetate) and heterogeneous (i.e., ZnO) catalysts were active among a number of catalysts tested, due to the
- Hyun, Min Jeong,Shin, Mi,Kim, Yong Jin,Suh, Young-Woong
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- Syntheses of isocyanates via amines and carbonyl fluoride
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Isocyanates are widely used in many different areas, but the most common synthesis route-phosgene route cannot fit the more and more rigorous restriction of safety and environment. Here, a facile synthesis method of isocyanates via amines and carbonyl fluoride is proven feasibly by expanding its applications to the syntheses of nine different isocyanates. And two differences with the phosgene route are proposed. The reaction could occur under milder conditions and afford isocyanates in good yields, especially for the isocyanates containing electron withdrawing groups. It is appealing for industrial application.
- Quan, Hengdao,Zhang, Ni,Zhou, Xiaomeng,Qian, Hua,Sekiya, Akira
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- A manufacturing method of a compound having a ureidopirimidine
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PROBLEM TO BE SOLVED: To obtain a compound having a ureido group useful as an intermediate for producing an isocyanate, without producing by-products, which are produced in conventional production processes, and in a high yield and high purity. SOLUTION: An organic primary amine of formula (1) and urea are subjected to ureidization reaction in the presence of an aromatic hydroxylcompound of formula (2). In the formula (1), R1is a 1-35C organic group, and a is 1 to 10. In the formula (2), A is a 6-50C organic group having an aromatic ring, and the organic group is replaced with b aromatic hydroxyl groups, and b is 1 to 3. COPYRIGHT: (C)2012,JPOandINPIT
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- Using carbon dioxide diarylbutadiene isocyanate production method (by machine translation)
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PROBLEM TO BE SOLVED: To provide a method in which there are not various problems shown in a prior art when isocyanate is manufactured without using phosgene, and that can stably manufacture isocyanate for the long period of time in good yield. SOLUTION: The manufacturing method of isocyanate includes: a process in which diaryl carbonate and an amine compound are made to react in the presence of an aromatic hydroxy compound as a reaction solvent, thereby a reaction mixture that includes carbamic acid aryl having an aryl group originated from diaryl carbonate, an aromatic hydroxy compound originated from diaryl carbonate, and diaryl carbonate is obtained; a process in which the reaction mixture is transported to a thermal cracking reactor; and a process in which the carbamic acid aryl is subjected to a thermal decomposition reaction to obtain isocyanate, wherein a reactor in which the reaction of diaryl carbonate and an amine compound is performed and a thermal cracking reactor of carbamic acid aryl are different. COPYRIGHT: (C)2013,JPO&INPIT
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- SILICA PARTICLES COATED WITH BETA-CYCLODEXTRIN FOR THE REMOVAL OF EMERGING CONTAMINANTS FROM WASTEWATER
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Provided is a silica particle coated with β-cyclodextrin, wherein said cyclodextrin is attached to said silica particle via at least one crosslinking agent and/or at least one copolymer. Also provided are methods of removing contaminants from a flowing or stationary liquid phase comprising the step of contacting said liquid phase with the silica particle coated with β-cyclodextrin.
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- METHOD FOR PREPARING ALIPHATIC DIISOCYANATE
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The present invention relates to a method for preparing an aliphatic diisocyanate by pyrolyzing an aliphatic dicarbamate in liquid phase, using a tin (II) or (IV) compound as a catalyst and a zwitterionic compound as a stabilizer, thereby remarkably inhibiting high-boiling by-products and providing the aliphatic diisocyanate with high yield.
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Paragraph 0032
(2014/10/16)
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- SEPARATION METHOD
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The present invention provides a separation method of separating (A) and (B), comprising: a step of separating at least either an active hydrogen-containing compound (A) or a compound (B) that reversibly reacts with (A) from a mixture containing (A) and (B) by distillation in a multistage distillation column; and a step of supplying the mixture to an inactive region formed within the multistage distillation column.
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Paragraph 0229; 0230
(2013/10/08)
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- PROCESS FOR THE PRODUCTION OF POLYISOCYANATES
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The invention provides a multistage process for continuously preparing organic polyisocyanates, preferably diisocyanates, more preferably aliphatic or cycloaliphatic diisocyanates, by reaction of the corresponding organic polyamines with carbonic acid derivatives and alcohols into monomeric polyurethanes of low molecular mass, and the dissociation of said polyurethanes. The invention further provides an associated preparation process in which at certain reaction stages the polyisocyanates prepared and unutilizable residues are removed and reusable by-products and intermediates are recycled to preliminary stages.
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- METHOD FOR PRODUCING CARBAMATE COMPOUND, CARBAMATE COMPOUND, AND METHOD FOR PRODUCING ISOCYANATE COMPOUND USING SAME
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The present invention relates to a method of producing a carbamate compound, comprising reacting a fluorine-containing carbonic diester compound represented by formula (1) and a non-aromatic diamine compound represented by formula (2) without using a catalyst, to thereby produce a carbamate compound represented by formula (3), and a method of producing an isocyanate compound represented by formula (20) from the carbamate compound without using a catalyst, wherein R represents a fluorine-containing monovalent aliphatic hydrocarbon group, and A represents a divalent aliphatic hydrocarbon group, a divalent alicyclic hydrocarbon group or a divalent aromatic-aliphatic hydrocarbon group. [Chem. 2] ????????H2N-A-NH2?????(2) [Chem. 4] ????????O=C=N-A-N=C=O?????(20)
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Paragraph 0073-0074
(2013/03/26)
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- PROCESS FOR THE PREPARATION OF ISOCYANATES
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An isocyanate is produced by reacting an amine with a stoichiometric excess of phosgene in the gas phase. This reaction is carried out at a temperature above the amine's boiling point to obtain a liquid stream containing the isocyanate and a gas stream containing hydrogen chloride and phosgene. The gas stream containing hydrogen chloride and phosgene thus produced is separated into a gas stream containing hydrogen chloride and a liquid stream containing phosgene. At least part of the liquid stream containing phosgene is then converted to a gas stream containing phosgene which gas stream is then recycled. The gaseous phosgene stream is maintained at a higher pressure than the liquid phosgene stream.
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Page/Page column 11-12
(2012/05/21)
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- USE OF A PISTON REACTOR TO IMPLEMENT A PHOSGENATION PROCESS
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A process for phosgenating an amine comprising employing a plug-flow type reactor with internal recycle is disclosed. The process can be continuous, which makes it possible to prepare, in a single stage, a (poly)isocyanate with a good yield, without formation of byproducts and on simplifying the plant in order to carry out the process so as to promote safety.
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Page/Page column 4
(2012/01/03)
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- PROCESS FOR THE PREPARATION OF N-SUBSTITUTED CARBAMIC ACID ESTER AND PROCESS FOR THE PREPARATION OF ISOCYANATE USING THE N-SUBSTITUTED CARBAMIC ACID ESTER
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The present invention provides a method for producing N-substituted carbamic acid-O-aryl ester derived from a compound having an ureido group, the method comprising the step of carrying out esterification or esterification and transesterification from the compound having the ureido group and a hydroxy composition containing one type or a plurality of types of hydroxy compounds.
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Page/Page column 183
(2011/06/10)
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- PROCESS FOR PRODUCING ISOCYANATE
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An object of the present invention is to provide a process that enables isocyanate to be produced stably over a long period of time and at high yield without encountering problems of the prior art during production of isocyanate without using phosgene. The present invention discloses a process for producing an isocyanate by subjecting a carbamic acid ester to a thermal decomposition reaction, including the steps of: recovering a low boiling point component in a form of a gaseous phase component from a thermal decomposition reaction vessel in which the thermal decomposition reaction is carried out; recovering a liquid phase component containing a carbamic acid ester from a bottom of the thermal decomposition reaction vessel; and supplying all or a portion of the liquid phase component to an upper portion of the thermal decomposition reaction vessel.
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Page/Page column 56
(2011/02/18)
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- ISOCYANATE PRODUCTION PROCESS
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An object of the present invention is to provide a process that enables isocyanate to be produced stably over a long period of time and at high yield without encountering problems of the prior art during production of isocyanate without using phosgene. The present invention discloses a process for producing an isocyanate by subjecting a carbamic acid ester to a thermal decomposition reaction, including the steps of: recovering a low boiling point component in a form of a gaseous phase component from a thermal decomposition reaction vessel in which the thermal decomposition reaction is carried out; recovering a liquid phase component containing a carbamic acid ester from a bottom of the thermal decomposition reaction vessel; and supplying all or a portion of the liquid phase component to an upper portion of the thermal decomposition reaction vessel.
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Page/Page column 45
(2011/05/03)
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- PROCESS FOR PRODUCING ISOCYANATES USING DIARYL CARBONATE
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An object of the present invention is to provide a process that enables isocyanate to be produced stably over a long period of time and at high yield without encountering problems of the prior art during production of isocyanate without using phosgene. The present invention provides an isocyanate production process including the steps of: obtaining a reaction mixture containing an aryl carbamate having an aryl group originating in a diaryl carbonate, an aromatic hydroxy compound originating in a diaryl carbonate, and a diaryl carbonate, by reacting a diaryl carbonate and an amine compound in the presence of a reaction solvent in the form of an aromatic hydroxy compound; transferring the reaction mixture to a thermal decomposition reaction vessel; and obtaining isocyanate by applying the aryl carbamate to a thermal decomposition reaction, wherein the reaction vessel in which the reaction between the diaryl carbonate and the amine compound is carried out and the thermal decomposition reaction vessel for the aryl carbamate are different.
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- PROCESS FOR PRODUCING ISOCYANATE USING DIARYL CARBONATE
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An object of the present invention is to provide a process that enables isocyanate to be produced stably over a long period of time and at high yield without encountering problems of the prior art during production of isocyanate without using phosgene. The present invention provides an isocyanate production process including the steps of: obtaining a reaction mixture containing an aryl carbamate having an aryl group originating in a diaryl carbonate, an aromatic hydroxy compound originating in a diaryl carbonate, and a diaryl carbonate, by reacting a diaryl carbonate and an amine compound in the presence of a reaction solvent in the form of an aromatic hydroxy compound; transferring the reaction mixture to a thermal decomposition reaction vessel; and obtaining isocyanate by applying the aryl carbamate to a thermal decomposition reaction, wherein the reaction vessel in which the reaction between the diaryl carbonate and the amine compound is carried out and the thermal decomposition reaction vessel for the aryl carbamate are different.
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Page/Page column 53
(2011/02/18)
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- FLUORINATED ETHER URETHANES AND METHODS OF USING THE SAME
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Compounds comprising end groups represented by formula (Rf-Q)a-X-(A-)b and compounds comprising the reaction product of components comprising a multifunctional isocyanate compound and a fluorinated compound represented by formula (Rf-Q)a-X—(Z)b. Each Rf is independently a partially fluorinated or fully fluorinated group selected from RfA(O)2CHL′-(CF2)n—; [RfB—(O)1—C(L)H—CF2—O]m—W—; CF3CFH—O—(CF2)p—; CF3—(O—CF2)Z—; and CF3—O—(CF2)3—O—CF—. Methods of making an article having a surface using the fluorinated compounds and treated articles are also disclosed.
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- DIMERIC AVERMECTIN AND MILBEMYCIN DERIVATIVES
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This invention provides for novel antiparasitic and pesticidal derivatives of avermectin and milbemycin compounds in which two avermectin or milbemycin members are linked together by a chemical linker. The resulting compounds may be used in veterinary compositions which are used in treating, controlling and preventing of endo- and ectoparasite infections and infestations in animals or for combating pests in plants or plant propagation material.
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Page/Page column 79
(2010/06/19)
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- METHOD FOR PRODUCING ISOCYANATES
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The present invention relates to a process for preparing isocyanates.
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Page/Page column 9-10
(2010/08/22)
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- METHOD FOR PRODUCTION OF ISOCYANATE USING COMPOSITION COMPRISING CARBAMIC ACID ESTER AND AROMATIC HYDROXY COMPOUND, AND COMPOSITION FOR TRANSPORT OR STORAGE OF CARBAMIC ACID ESTER
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An object of the present invention is to provide an isocyanate production process, which is free of the various problems found in the prior art, and which uses a composition containing a carbamic acid ester and an aromatic hydroxy compound when producing isocyanate without using phosgene, as well as a carbamic acid ester composition for transferring or storing carbamic acid ester. The present invention discloses an isocyanate production process including specific steps and using a composition containing a carbamic acid ester and an aromatic hydroxy compound, as well as a composition for transfer or storage of carbamic acid ester comprising the carbamic acid ester and the specific aromatic hydroxy compound.
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Page/Page column 64
(2010/02/17)
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- COSMETIC OR DERMATOLOGICAL COMPOSITION COMPRISING A POLYMER BEARING JUNCTION GROUPS, AND COSMETIC TREATMENT PROCESS
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The present patent application relates to a cosmetic or dermatological composition comprising, in a cosmetically or dermatologically acceptable medium, a polymer comprising: (a) a polymer backbone that may be obtained by reaction: of a polyol comprising 3 to 6 hydroxyl groups;of a monocarboxylic acid containing 6 to 32 carbon atoms;of a polycarboxylic acid comprising at least two carboxylic groups COOH, and/or of a cyclic anhydride such as a polycarboxylic acid and/or of a lactone comprising at least one carboxylic group COOH; and(b) at least one junction group linked to the said polymer backbone and capable of establishing H bonds with one or more partner junction groups, each pairing of a junction group involving at least three H (hydrogen) bonds. The patent application also concerns a cosmetic treatment process using the said composition.
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- METHOD FOR PRODUCING ISOCYANATES
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The present invention relates to a multiple-stage process for the continuous preparation of organic, distillable polyisocyanates, preferably diisocyanates, more preferably aliphatic or cycloaliphatic diisocyanates, by reaction of the corresponding organic poly-amines with ureas to form low-molecular monomeric polyureas, and the thermal decomposition thereof.
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Page/Page column 7
(2010/12/26)
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- PROCESS FOR PREPARING POLYISOCYANATES
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The present invention relates to a process for preparing polyisocyanates by oligomerization of isocyanates.
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- METHOD FOR PRODUCING ISOCYANATE
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An object of the present invention is to provide a process that enables isocyanates to be stably produced over a long period of time at high yield without encountering various problems as found in the prior art when producing isocyanates without using phosgene. The present invention discloses a process for producing an isocyanate, comprising the steps of: reacting a carbamic acid ester and an aromatic hydroxy compound to obtain an aryl carbamate having a group derived from the aromatic hydroxy compound; and subjecting the aryl carbamate to a decomposition reaction, wherein the aromatic hydroxy compound is an aromatic hydroxy compound which is represented by the following formula (1) and which has a substituent R1 at at least one ortho position of a hydroxyl group: (wherein ring A represents an aromatic hydrocarbon ring in a form of a single or multiple rings which may have a substitute and which have 6 to 20 carbon atoms; R1 represents a group other than a hydrogen atom in a form of an aliphatic alkyl group having 1 to 20 carbon atoms, an aliphatic alkoxy group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an aryloxy group having 6 to 20 carbon atoms, an aralkyl group having 7 to 20 carbon atoms or an aralkyloxy group having 7 to 20 carbon atoms, the group containing an atom selected from a carbon atom, an oxygen atom and a nitrogen atom; and R1 may bond with A to form a ring structure).
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Page/Page column 29
(2009/09/05)
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- PROCESSES FOR PREPARING LOW-CHLORINE ISOCYANATES
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Processes comprising providing an amine reactant, and reacting the amine reactant with a stream of phosgene in a reaction zone to form a product comprising a corresponding isocyanate, wherein the phosgene stream has a CO content of 0.5% by weight or more.
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Page/Page column 4
(2009/04/24)
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