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Method for preparing toluylene diisocyanate, specific mixture of toluylene diamine and water, and use of mixture for preparing toluylene diisocyanate
Method for preparing toluylene diisocyanate, specific mixture of toluylene diamine and water, and use of mixture for preparing toluylene diisocyanate
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机译：甲苯二异氰酸酯的制备方法，甲苯二胺与水的特定混合物以及该混合物在制备甲苯二异氰酸酯中的用途
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摘要
Toluylene diisocyanate is nitrated toluene to give dinitrotoluene, optionally hydrogenated dinitropolene in the presence of a solvent or diluent to obtain a crude solution of toluylene diamine and reaction water, The crude solution of diamine and water is processed to give an intermediate mixture of toluylene diamine and water, wherein the processing reaction is stopped when the water content is about 1 to 40% by weight, preferably about 2 to 10% by weight of the intermediate mixture. This intermediate mixture is transferred from the first production plant to the second production plant, wherein the intermediate mixture of TDA and water is obtained as anhydrous toluylene diamine with commercially available quality, followed by toluene reaction of toluylene diamine Prepared by providing ylene diisocyanate. Further processing of the anhydrous toluylene diamine before the phosgenation reaction is optional.;The present invention also relates to an intermediate mixture of toluylene diamine and water having a freezing point of 95 ° C. or lower, and the use of this intermediate mixture for preparing toluylene diisocyanate. Using this intermediate mixture to prepare toluylene diisocyanate is preferably carried out at a point (or location) different from the point of production of the intermediate mixture of toluylene diamine and water.
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