公开(公告)号：EP1648860B2

公开(公告)日：2014-09-10

申请号：EP04767766.1

申请日：2004-07-23

Applicant: Invista Technologies S.à.r.l.

Inventor： GERBER, Jérôme ,  LECONTE, Philippe ,  AMOROS, Daniel

IPC: C07C253/34 ,  C07C253/10 ,  C07C255/04

CPC classification number: C07C253/34 ,  B01D3/14 ,  Y10S203/20 ,  C07C255/04

公开(公告)号：EP1633700B1

公开(公告)日：2012-04-25

申请号：EP04742667.1

申请日：2004-05-07

Applicant: Invista Technologies S.à.r.l.

Inventor： ROSIER, Cécile ,  LECONTE, Philippe ,  BOURGEOIS, Damien

IPC: C07C255/04 ,  C07C253/34 ,  C07C253/10

CPC classification number: C07C253/10 ,  C07C253/34 ,  Y02P20/584 ,  C07C255/04

Abstract: The invention relates to a method of preparing dinitriles, involving hydrocyanation of unsaturated nitrile compounds in the presence of a catalyst based on metallic elements in zero oxidation state and organophosphorous ligands. More specifically, the invention relates to a method of recovering a catalyst for the hydrocyanation of unsaturated nitriles into dinitriles from the hydrocyanation medium. The inventive method consists in: controlling the concentration of unsaturated nitriles in the reaction medium originating from the hydrocyanation reaction, in order to obtain a weight concentration of unsaturated nitriles of less than 20 % in said medium; and supplying the aforementioned medium in a decantation step in two phases, namely an upper and lower phase. The lower phase comprises the majority of the catalytic system, while the upper phase essentially comprises the nitriles.