公开(公告)号：US4294666A

公开(公告)日：1981-10-13

申请号：US178673

申请日：1980-08-15

申请人： Hans J. Astheimer ,  Horst Brandtstaedter ,  Rainer Ohlinger ,  Willy Van Pee ,  Jaak Van Steen ,  Friedrich Sauer ,  Rudolf Schmidt ,  Siegfried Krueger

发明人： Hans J. Astheimer ,  Horst Brandtstaedter ,  Rainer Ohlinger ,  Willy Van Pee ,  Jaak Van Steen ,  Friedrich Sauer ,  Rudolf Schmidt ,  Siegfried Krueger

IPC分类号： B01D3/10 ,  C07C20060101 ,  C07C265/12 ,  C07C119/048

CPC分类号： C07C263/20

摘要： A process for the manufacture of 4,4'-diphenylmethane diisocyanate and a mixture of diphenylmethane diisocyanate isomers containing a controllable amount of uretdione and hydrolizable chlorine which comprises feeding crude MDI to an evaporator, condensing a head fraction in two stages in the presence of an inert gas, feeding the first stage condensate to a distillation column, producing a mixture of diphenylmethane diisocyanate isomers as an overhead, producing 4,4'-diphenylmethane diisocyanate as a side draw, and condensing each of the overhead and side draw in two stages in the presence of an inert gas.

摘要翻译： 制备4,4'-二苯基甲烷二异氰酸酯的方法和含有可控量的脲二酮和可水解氯的二苯基甲烷二异氰酸酯异构体的混合物，其包括将粗MDI加入到蒸发器中，在一个 惰性气体，将第一级冷凝物供给到蒸馏塔中，产生作为塔顶馏出物的二苯基甲烷二异氰酸酯异构体的混合物，制备作为侧馏分的4,4'-二苯基甲烷二异氰酸酯，并将塔顶馏分和侧馏分分两个阶段 存在惰性气体。

公开(公告)号：US5207942A

公开(公告)日：1993-05-04

申请号：US653566

申请日：1991-02-08

申请人： Dietrich Scherzer ,  Roland Minges ,  Werner Langer ,  Bernd Bruchmann ,  Wolfgang Heider ,  Peter Keller ,  Arnold Schmitt ,  Willy Van Pee

发明人： Dietrich Scherzer ,  Roland Minges ,  Werner Langer ,  Bernd Bruchmann ,  Wolfgang Heider ,  Peter Keller ,  Arnold Schmitt ,  Willy Van Pee

IPC分类号： C07C263/18 ,  C07C263/20 ,  C07C265/14

CPC分类号： C07C263/18 ,  C07C263/20

摘要： Mixtures of diphenylmethane diisocyanates and polyphenylpolymethylene polyisocyanates (crude MDI) having a reduced iodine color number are prepared by reacting the corresponding mixtures of diphenylmethanediamines and polyphenylpolymethylene-polyamines with phosgene in the presence of one or more inert organic solvents at elevated temperatures by a process in which low molecular weight alkanols, polyhydric alcohols, preferably dihydric to octahydric alcohols having a molecular weight of from 60 to 350, or mixtures thereof are incorporated in an effective amount, advantageously in an amount of from 0.01 to 5% by weight, based on the weight of crude MDI, into the reaction mixture after the end of the phosgenation, the phosgene and the inert organic solvent are then separated off, from 0 to 5% by weight, based on the weight of crude MDI, of one or more phenol-based antioxidants and/or aryl phosphite are added to the reaction product, and the reaction mixture is subjected to a thermal treatment.

摘要翻译： 通过在一个或多个惰性有机溶剂的存在下，在高温下使二苯基甲烷二胺和聚苯基聚亚甲基 - 多胺的相应混合物与光气反应来制备具有降低的碘色数的二苯基甲烷二异氰酸酯和聚苯基聚亚甲基多异氰酸酯（粗MDI）的混合物， 低分子量链烷醇，多元醇，优选分子量为60至350的二元至八元醇或其混合物以有效量引入，有效量为基于重量的0.01至5重量％ 的粗MDI，在光气化结束后进入反应混合物中，然后分离出光气和惰性有机溶剂，基于粗MDI的重量计，0至5重量％的一种或多种酚基 将抗氧化剂和/或亚磷酸芳基酯加入到反应产物中，并将反应混合物进行热处理 音乐