- Method for efficiently preparing toluene diisocynate compound by polyoxometallate
-
The invention discloses a method for preparing toluene diisocynate (TDI) by coupling 2,6-diaminotoluene and methanol under the catalysis of a polyoxometallate (wherein the polyoxometallate is one of six basic configurations of Keggin type, Wells-Dawson type, Anderson type, Lindeqvist type, Waugh type and Silverton type, and the Anderson type configuration is mainly adopted). The method comprises the specific implementation steps: putting a catalyst, a solvent methylbenzene, raw materials of 2,6-diaminotoluene, methanol and hydrogen peroxide, an acid-binding agent and a dehydrating agent into aclean reaction tube together, performing magnetic stirring for sufficient reaction in an air atmosphere under a certain temperature condition, and performing separation and purification to obtain a target product. According to the invention, the use of reagents with high corrosivity and easiness in poisoning and high-temperature and high-pressure reaction conditions in the traditional synthesis method are avoided, hydrogen peroxide is used as oxidizing agent, heteropolyacid taking Fe, Cu, Ni, Cr and other non-noble metals as central metals is used as a catalyst to catalyze and generate toluene diisocynate (TDI), the catalyst has extremely high reaction activity, and after the reaction is finished, the catalyst used by a sample subjected to simple treatment can be recycled, so that the method is environment-friendly, the cleanness of the reaction is improved, and the production and manufacturing cost is reduced.
- -
-
Paragraph 0014; 0025-0026; 0027-0028; 0029-0030; 0031-0050
(2020/11/09)
-
- PROCESS FOR PREPARING ISOCYANATES
-
The invention relates to a process for preparing isocyanates by reacting the corresponding amines with phosgene in the gas phase, if appropriate in the presence of an inert medium, in which the amine and the phosgene are first mixed and converted to the isocyanate in a reactor, and in which a reaction gas which comprises isocyanate and hydrogen chloride and leaves the reactor is cooled in a quench space of a quench by adding a quench medium. The quench medium on addition to the quench space has a temperature above the condensation temperature or the desublimation temperature of the reaction gas.
- -
-
Page/Page column 3-4
(2012/02/01)
-
- PROCESS FOR THE PREPARATION OF ISOCYANATES
-
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.
- -
-
Page/Page column 11
(2012/05/21)
-
- PROCESS FOR PREPARING ISOCYANATES
-
The invention relates to a process for preparing isocyanates by reacting the corresponding amines with phosgene in the gas phase, if appropriate in the presence of at least one inert medium, the phosgene being passed into a reactor (21) through a first inlet and the amine through a second inlet of an ejector (1). The first inlet and the second inlet open into a mixing zone (17) in which the phosgene and the amine are mixed to give a reaction mixture. The mixing zone (17) is followed downstream by a diffuser (19) in which pressure and temperature of the reaction mixture composed of phosgene and amine are increased.
- -
-
Page/Page column 5
(2011/05/08)
-
- COSMETIC OR DERMATOLOGICAL COMPOSITION COMPRISING A POLYMER BEARING JUNCTION GROUPS, AND COSMETIC TREATMENT PROCESS
-
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.
- -
-
-
- PROCESSES FOR PREPARING LOW-CHLORINE ISOCYANATES
-
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.
- -
-
Page/Page column 4
(2009/04/24)
-
- Process for the production of aromatic discocyanates in the gas
-
Aromatic diisocyanates are produced by reacting in the gas phase the corresponding primary aromatic diamine with phosgene. The phosgene and the primary aromatic diamine are reacted within a mean residence time of from 0.05 to 15 seconds. The aromatic diamine used contains less than 0.05 mole % overall of aliphatic amine containing no keto groups, per mole of primary amino groups.
- -
-
Page/Page column 5
(2009/06/27)
-
- Process for the preparation of isocyanates in the gas phase
-
An isocyanate is produced by reacting a primary amine with phosgene in the gas phase above the boiling point of the amine over an average contact time of 0.05 to 15 seconds under adiabatic conditions.
- -
-
Page/Page column 4
(2008/12/06)
-
- Process for the preparation of isocyanates in the gas phase
-
Isocyanates are produced by reaction of primary amines with phosgene in the gas phase. In this process, the reaction is terminated by guiding the reaction mixture from the reaction chamber through a cooling stretch into which liquids are injected. Direct cooling takes place in the cooling stretch in one stage in two or more cooling zones connected in series.
- -
-
Page/Page column 5-6
(2008/12/06)
-
- Process for the production of the toluene diisocyanate
-
The invention relates to a process for the production of toluene diisocyanate, in which the crude toluenediamine obtained from the hydrogenation is purified and then phosgenated. The purification step reduces the total amount of cyclic ketones to less than 0.1 % by weight, based on 100% by weight of the toluenediamine.
- -
-
Page/Page column 5; 6
(2008/06/13)
-
- METHOD FOR PRODUCING ISOCYANATES
-
The invention relates to a method for producing isocyanates by reacting amines with phosgene in the gaseous phase in a reaction zone, whereby in order to terminate the reaction, the reaction mixture is guided through a zone, into which a liquid is injected. The invention is characterised in that the reaction mixture is guided between the reaction zone and the zone into which the liquid is injected, through a zone with a reduced flow cross-section.
- -
-
Page/Page column 8
(2008/06/13)
-
- Process for the production of (poly)isocyanates in the gas phase
-
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von Diisocyanaten durch Phosgenierung der entsprechenden Diamine bei dem die dampff?rmigen Diamine, gegebenenfalls verdünnt mit einem Inertgas oder mit den D?mpfen eines inerten L?sungsmittels, und Phosgen getrennt auf Temperaturen von 200°C bis 600°C erhitzt und in einem Rohrreaktor (2) vermischt und zur Reaktion gebracht werden, dadurch gekennzeichnet, dass in dem Rohrreaktor (2) eine Anzahl n ≥ 2 von parallel zur Achse des Rohrreaktors ausgerichteten Düsen (5) angeordnet sind, wobei der die Diamine enthaltende Strom dem Rohrreaktor (2) über die n Düsen (5) zugeführt wird und der Phosgenstrom dem Rohrreaktor (2) über den verbleibenden freien Raum (6) zugeführt wird.
- -
-
-
- METHOD FOR PRODUCING ISOCYANATES
-
The invention relates to a continuous method for producing isocyanates by reacting primary amines with phosgene. The invention is characterized in that the reaction is carried out in a cascade of at least two tubular reactors and, after each reactor, the gas phase resulting during the reaction is separated in a phase separator, and only the liquid phase is fed to the next reactor or to the product purification. In addition, the reaction volume of the first tubular reactor is equal to only a fraction of the total reaction volume.
- -
-
-
- Ethylenic silicon compounds and thermoplastic elastomers obtained therefrom
-
The invention provides organosilicon compounds of the formula: STR1 in which: N IS 1, 2 OR 3; Each R, which may be identical or different, is a monovalent organic group which contains a carbon-carbon double bond and from 2 to 10 carbon atoms; Each R1, which may be identical or different, is a straight or branched alkyl radical optionally substituted by one or more halogen atoms or cyano groups; an aryl radical or an alkylaryl radical optionally substituted by one or more halogen atoms; R2 is a straight or branched divalent alkylene or alkylidene radical possessing up to 4 carbon atoms; X is a divalent radical consisting of, or containing, at least one hetero-atom selected from oxygen, sulphur and nitrogen atoms, the radical being attached to the radical R2 via a said hetero-atom; G is an organic radical of valency (m+ l) possess from 1 to 30 carbon atoms; m is 1, 2 or 3; And each Y, which may be identical or different, is a functional group selected from: --NO2, STR2 --COOM (where M represents a sodium, potassium or lithium atom); --COOR4 ; STR3 --COCl; --OH; --OR4 ; STR4 --SH; --SR4 ; STR5 --CONH2 ; --CSNH2 ; --CN; --CH2 --NH2 ; --CHO; STR6 --NCO; STR7 wherein R3 represents a hydrogen atom or a straight or branched alkyl radical possessing up to 6 carbon atoms and R4 represents an alkyl radical possessing up to 4 carbon atoms, with the proviso that two Y groups can together constitute an imide group STR8 wherein R5 represents a hydrogen atom or a straight or branched alkyl radical possessing up to 4 carbon atoms. These are useful intermediates in the preparation of disilanes and silicon polymers, in particular of polyethylenic silicon compounds which can be polymerized with an α, ω-dihydrogenopolysiloxane to give thermoplastic elastomers.
- -
-
-
- Amide waxes
-
Organic amide waxes having at least two amide groups per molecule are prepared by reacting monocarboxylic acids preferably fatty acids with organic di- or poly-isocyanates; the wax products are useful particularly as lubricants.
- -
-
-