91-08-7Relevant articles and documents
Method for efficiently preparing toluene diisocynate compound by polyoxometallate
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Paragraph 0014; 0025-0026; 0027-0028; 0029-0030; 0031-0050, (2020/11/09)
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.
PROCESS FOR THE PREPARATION OF ISOCYANATES
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Page/Page column 11, (2012/05/21)
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.
COSMETIC OR DERMATOLOGICAL COMPOSITION COMPRISING A POLYMER BEARING JUNCTION GROUPS, AND COSMETIC TREATMENT PROCESS
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, (2010/10/03)
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.