公开(公告)号：US10759741B2

公开(公告)日：2020-09-01

申请号：US14904726

申请日：2014-07-16

Applicant: INVISTA NORTH AMERICA S.A R.L.

Inventor： Sudhir N. V. K. Aki ,  James M. Garner ,  William J. Tenn, III ,  Thomas E. Vos

IPC: C07C253/10 ,  C07C253/34 ,  B01D3/14 ,  B01J31/18

Abstract: A solvent is at least partially separated from a catalyst. The catalyst comprises nickel and a bidentate phosphorus-containing ligand. The method for separation involves distilling a catalyst solution. The ratio of 2-pentenenitrile to 3-pentenenitrile in distillation column bottoms is controlled to reduce the amount of 3-pentenenitrile which is isomerized to form 2-methyl-3-butenenitrile. Isomerization of 3-pentenenitrile to 2-methyl-3-butenenitrile and subsequent isomerization of 2-methyl-3-butenenitrile to 2-methyl-2-butenenitrile, and/or hydrocyanation of 2-methyl-3-butenenitrile to methylglutaronitrile represents a loss in adiponitrile yield in a process for making adiponitrile.