公开(公告)号：US09493405B2

公开(公告)日：2016-11-15

申请号：US14941167

申请日：2015-11-13

Applicant: BASF SE

Inventor： Tim Jungkamp ,  Robert Baumann ,  Michael Bartsch ,  Gerd Haderlein ,  Hermann Luyken ,  Jens Scheidel ,  Tobias Aechtner ,  Peter Pfab ,  Petra Deckert ,  Wolfgang Siegel ,  Peter Bassler

IPC: C07C253/30 ,  C07C253/10

CPC classification number: C07C253/30 ,  C07C253/10 ,  Y02P20/582 ,  C07C255/07

Abstract: A process is described for preparing 3-pentenenitrile, characterized by the following process steps: (a) isomerizing a reactant stream which comprises 2-methyl-3-butenenitrile over at least one dissolved or dispersed isomerization catalyst to give a stream 1 which comprises the at least one isomerization catalyst, 2-methyl-3-butenenitrile, 3-pentenenitrile and (Z)-2-methyl-2-butenenitrile, (b) distilling stream 1 to obtain a stream 2 as the top product which comprises 2-methyl-3-butenenitrile, 3-pentenenitrile and (Z)-2-methyl-2-butenenitrile, and a stream 3 as the bottom product which comprises the at least one isomerization catalyst, (c) distilling stream 2 to obtain a stream 4 as the top product which, compared to stream 2, is enriched in (Z)-2-methyl-2-butenenitrile, based on the sum of all pentenenitriles in stream 2, and a stream 5 as the bottom product which, compared to stream 2, is enriched in 3-pentenenitrile and 2-methyl-3-butenenitrile, based on the sum of all pentenenitriles in stream 2, (d) distilling stream 5 to obtain a stream 6 as the bottom product which comprises 3-pentenenitrile and a stream 7 as the top product which comprises 2-methyl-3-butenenitrile.