Separation of dinitrile from hydrocyanation mixture, e.g. adiponitrile for use in polyamide monomer production, involves distillation in a single column from which the dinitrile fraction is taken off at a point below the feed inlet

摘要

Dinitriles (I) are separated from mixtures obtained by the hydrocyanation of unsaturated mono-nitriles by distillation in a single column to give a top product and a bottom product containing low- and high-boilers respectively, and an intermediate fraction containing (I) which is taken off at a point below the feed point. A method for the production and separation of dinitriles (I) from a mixture obtained by the hydrocyanation of unsaturated mono-nitriles (I), involves distillation in a column to give a top fraction containing compounds with a boiling point below that of (I), an intermediate fraction containing (I) (from a theoretical plate in part of the column below the feed point) and a bottom fraction containing higher-boiling products.