4223-31-8Relevant academic research and scientific papers
High-performance segmented polyurea by transesterification of diphenyl carbonates with aliphatic diamines
Pan, Wen Chen,Lin, Ching-Hsuan,Dai, Shenghong A.
, p. 2781 - 2790 (2014)
In an effort to develop a green process for the production of elastomeric polyurethane-urea (PUaE) through a nonisocyanate route, a highly practical method was found using diphenyl carbonate (DPC) instead of diisocyanate as the carbonylation agent. The tr
METHOD FOR PRODUCING CARBAMATE AND METHOD FOR PRODUCING ISOCYANATE
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Paragraph 0367-0368; 0379-0381; 0399-0401; 0406-0408; ..., (2021/06/22)
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.
MULTISTEP PROCESS FOR THE PREPARATION OF DIISOCYANATES
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Page/Page column 17, (2019/04/26)
The present invention relates to a process for the preparation of organic diisocyanates by cleaving the corresponding diurethanes into the diisocyanate and a hydroxy compound and separating the diisocyanate from the hydroxy compound by distillation wherein the diisocyanate is obtained as the distillate.
MULTISTEP PROCESS FOR THE PREPARATION OF HEXAMETHYLENE DIISOCYANATE, PENTAMETHYLENE DIISOCYANATE OR TOLUENE DIISOCYANATE
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Page/Page column 11, (2019/04/26)
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.
Reaction method accompanied by production of gas component
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Paragraph 18; 19, (2018/11/23)
The present invention relates to a reaction method comprising a step of supplying a liquid containing at least one raw material compound and a low-boiling compound having a standard boiling point lower than a standard boiling point of the raw material compound to a flow channel, a step of heating the liquid to produce a liquid reaction product and a gas component by a reaction of the raw material compound, and a step of separating a liquid phase containing the reaction product from a gas phase containing the gas component and the low-boiling compound.
TWO-STEP AND ONE-POT PROCESSES FOR PREPARATION OF ALIPHATIC DIISOCYANATES
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Paragraph 0112-0113, (2017/02/02)
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.
Two-stage method and one-pot synthesis method for preparing aliphatic diisocyanate
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Paragraph 0139; 0140; 0141; 0142; 0147-0167, (2017/10/11)
The invention relates to a two-stage method and one-pot synthesis method for preparing aliphatic diisocyanate. The two-stage method or the one-pot synthesis method is adopted for preparing aliphatic diisocyanate through aliphatic diamine and diaryl carbonic ester. Also, aliphatic polyamine and diaryl carbonic ester also can be used for preparing polyisocyanates. According to the synthesis method provided by the invention, phosgene or highly toxic reagents and a chlorinated solvent are not adopted during the whole process.
Using carbon dioxide diarylbutadiene isocyanate production method (by machine translation)
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Paragraph 0119, (2017/01/02)
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
SEPARATION METHOD
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Paragraph 0214, (2013/10/08)
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.
PROCESS FOR PRODUCING ISOCYANATE USING DIARYL CARBONATE
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Page/Page column 43, (2011/02/18)
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.
