Method for removing 6-aminocapronitrile from mixtures that contain 6-aminocapronitrile, adipodinitrile and hexamethylenediamine
申请人:——
公开号:US20040015004A1
公开(公告)日:2004-01-22
The invention relates to a method for removing, by distillation, 6-aminocapronitrile from mixtures that contain 6-aminocapronitrile, adipodinitrile and hexamethylenediamine, by a) removing the hexamethylenediamine from the mixture while obtaining a mixture (I) that has a hexamethylenediamine content of less than 1 wt.-%, b) removing completely or partially the 6-aminocapronitrile from mixture (I) while obtaining a mixture (II) whose content in substances that have a higher boiling point as 6-aminocapronitrile under distillation conditions and that cannot be formed by dimerization reactions when 6-aminocapronitrile is thermally treated is less than 1 wt.-%, and c) completely or partially removing from mixture (II) the hexamethylenediamine that might be present while obtaining a mixture (IV) whose hexamethylenediamine content is higher than that of mixture (II), and a mixture (V) whose hexamethylenediamine content is lower than that of mixture (II). A process is provided for tire distillative separation of 6-aminocapronitrile from mixtures containing 6-aminocapronitrile, adipodinitrile and hexamethylenediamine, wherein
a) the hexamethylenediamine is separated from the mixture to give a mixture (I) with a hexamethylenediamine content of less than 1% by weight;
b) all or part of the 6-aminocapronitrile is separated from the mixture (I) to give a mixture (II) whose content of substances which boil above 6-aminocapronitrile under distillation conditions and cannot be formed by dimerization reactions of 6-aminocapronitrile under thermal stress is less than 1% by weight; and
c) all or part of the hexamethylenediamine present is separated from the mixture (II) to give a mixture (IV) whose hexamethylenediamine content is higher than that of the mixture (II), and a mixture (V) whose hexamethylenediamine content is lower than that of the mixture (II).
该发明涉及一种从含有6-氨基己腈、己二腈和六亚甲基二胺的混合物中通过蒸馏去除6-氨基己腈的方法,包括a) 从混合物中去除六亚甲基二胺,同时获得具有低于1重量%六亚甲基二胺含量的混合物(I),b) 从混合物(I)中完全或部分去除6-氨基己腈,同时获得在蒸馏条件下具有比6-氨基己腈沸点更高且在6-氨基己腈热处理时无法通过二聚反应形成的物质含量低于1重量%的混合物(II),c) 从混合物(II)中完全或部分去除可能存在的六亚甲基二胺,同时获得其六亚甲基二胺含量高于混合物(II)的混合物(IV),以及其六亚甲基二胺含量低于混合物(II)的混合物(V)。提供了一种用于从含有6-氨基己腈、己二腈和六亚甲基二胺的混合物中通过蒸馏分离6-氨基己腈的方法,其中a) 将六亚甲基二胺从混合物中分离得到六亚甲基二胺含量低于1重量%的混合物(I);b) 从混合物(I)中分离全部或部分6-氨基己腈,得到在蒸馏条件下沸点高于6-氨基己腈且在热应力下6-氨基己腈不能通过二聚反应形成的物质含量低于1重量%的混合物(II);c) 从混合物(II)中分离可能存在的六亚甲基二胺,得到其六亚甲基二胺含量高于混合物(II)的混合物(IV),以及其六亚甲基二胺含量低于混合物(II)的混合物(V)。