公开(公告)号：US4014914A

公开(公告)日：1977-03-29

申请号：US518076

申请日：1974-10-25

申请人： Hans Joachim Pistor ,  Herwig Hoffmann ,  Hans-Ingo Joschek ,  Gotthilf Wenner

发明人： Hans Joachim Pistor ,  Herwig Hoffmann ,  Hans-Ingo Joschek ,  Gotthilf Wenner

IPC分类号： C07C41/28 ,  C08G18/76 ,  C07C119/02

CPC分类号： C08G18/7664 ,  C07C263/10

摘要： Production of 4,4'-diphenylmethane diisocyanate and a mixture of diisocyanates and polyisocyanates by the phosgenation of pure 4,4'-diaminodiphenylmethane and a mixture of diamines and polyamines. 4,4'-Diaminodiphenylmethane is obtained by distillation of the mixture of products obtained from the reaction of aniline with formaldehyde and crystallization of the distillate from a solvent. The combined distillation residue and mother liquor from the crystallization form the mixture for reaction with phosgene to produce a mixture of diisocyanates and polyiisocyanates. This process produces a highly pure 4,4'-diphenylmethane diisocyanate which is particularly suitable for the production of polyurethanes serving as intermediates in the manufacture of rigid foams or as glue.

摘要翻译： 通过纯的4,4'-二氨基二苯基甲烷和二胺和多胺的混合物的光气化生产4,4'-二苯基甲烷二异氰酸酯和二异氰酸酯和多异氰酸酯的混合物。 通过蒸馏从苯胺与甲醛的反应获得的产物的混合物和馏出液从溶剂中的结晶，得到4,4'-二氨基二苯基甲烷。 合并的蒸馏残余物和母液从结晶形成混合物以与光气反应以产生二异氰酸酯和聚异氰酸酯的混合物。 该方法产生高纯度的4,4'-二苯基甲烷二异氰酸酯，其特别适用于生产用于制造刚性泡沫或作为胶水的中间体的聚氨酯。