Patent ID: 8373001

Claim:
A process for the manufacture of dinitrile compounds by hydrocyanation of mononitrile compounds comprising an ethylenic unsaturation by reaction with hydrogen cyanide in the presence of a catalytic system comprising an organometallic complex and a cocatalyst comprising metal ions, said process comprising the following successive steps: I) separating the organometallic complex from a liquid reaction medium E 1 obtained after hydrocyanation of unsaturated nitrile compounds and obtaining a second liquid medium E 2 comprising dinitriles and metal ions originating from the cocatalyst, II) extracting from the second liquid medium E 2 metal ions originating from the cocatalyst with an ion-exchange resin and obtaining a third medium E 3 comprising dinitriles, and III) separating the dinitriles from the third medium E 3 .