Patent ID: 9586892
Date: 2017-03-07
CPC Classifications: C07C

Claim:
1. A method for minimising the amount of pentenenitrile oligomers formed in a process for isomerizing cis-2-pentenenitrile to 3-pentenenitrile in the presence of an aluminium oxide catalyst; said method comprising isomerizing the cis-2-pentenenitrile in the presence of an aluminium oxide catalyst comprising an alkali metal and/or alkaline earth metal and/or iron, wherein the alkali metal and/or alkaline earth metal and/or iron content of the aluminum oxide catalyst, measured in the form of alkali metal oxide and/or alkaline earth metal oxide and/or iron oxide, respectively, is less than 5000 ppm by weight of the aluminum oxide catalyst, wherein the aluminum oxide catalyst comprises sodium, and wherein the sodium content is at least 5.5 ppm and less than 10 ppm by weight of the aluminum oxide catalyst.