公开(公告)号：US5496941A

公开(公告)日：1996-03-05

申请号：US375410

申请日：1995-01-18

申请人： Josef Ritz ,  Rolf Fischer ,  Werner Schnurr ,  Gu/ nther Achhammer ,  Hermann Luyken ,  Eberhard Fuchs

发明人： Josef Ritz ,  Rolf Fischer ,  Werner Schnurr ,  Gu/ nther Achhammer ,  Hermann Luyken ,  Eberhard Fuchs

IPC分类号： C07D201/08 ,  C07D201/16

CPC分类号： C07D201/16 ,  Y02P20/52

摘要： Crude capronitrile is purified by hydrogenation, subsequent treatment in an acidic medium and subsequent distillation in an alkaline medium, by a process in which(a) 6-aminocapronitrile is converted into crude caprolactam by reaction with water,(b) high boilers and low boilers are separated off from the crude caprolactam from step (a),(c) the crude caprolactam from step (b) is treated with hydrogen at from 50.degree. to 150.degree. C. and from 1.5 to 250 bar in the presence of a hydrogenation catalyst and, if desired, of a solvent to give a mixture A,(d1) mixture A in a solvent is passed, at from 30.degree. to 80.degree. C. and from 1 to 5 bar, over an ion exchanger containing terminal acid groups to give a mixture B1, or(d2) mixture A is distilled in the presence of sulfuric acid, any solvent present being removed before the addition of the sulfuric acid, to give a mixture B2, and(e) mixture B1 or mixture B2 is distilled in the presence of a base to give pure caprolactam.

摘要翻译： 通过氢化纯化粗碳腈，随后在酸性介质中处理，随后在碱性介质中进行蒸馏，其中（a）通过与水反应将（a）6-氨基己腈转化为粗己内酰胺，（b）高锅炉和低锅炉 与步骤（a）中的粗己内酰胺分离，（c）步骤（b）中的粗己内酰胺在氢化催化剂存在下在50-150℃和1.5-250巴下用氢处理 并且如果需要，得到溶剂以得到混合物A，（d1）溶剂中的混合物A在30℃至80℃和1至5巴条件下通过含有末端酸基团的离子交换剂 得到混合物B1，或（d2）在硫酸存在下蒸馏混合物A，在加入硫酸之前，除去存在的任何溶剂，得到混合物B2，并且（e）蒸馏出混合物B1或混合物B2 在碱的存在下得到纯己内酰胺。