Patent ID: 7501045
Filing Date: 2009-03-10
Classification: B01D,C07C,Y10S

Abstract:
1. A process for the manufacture and separation of dinitriles from a medium originating from a hydrocyanation of unsaturated mononitriles, comprising the steps of: a) feeding the medium comprising the dinitriles to a distillation column, b) recovering, at the column top, compounds with a lower boiling point than that of the dinitriles, c) recovering an intermediate fraction comprising the dinitriles from a theoretical plate situated in a lower part of the column with respect to a feed point of the medium comprising the dinitriles, and d) recovering, at the column bottom, products with a higher boiling point than that of the dinitriles, wherein the recovery of the intermediate fraction is carried out either without reflux or with reflux with a reflux ratio of between 1 and 6% by weight of the intermediate fraction.