Removal of halides from halide-containing nitrile mixtures

摘要

Halides are removed from halide-containing nitrile mixtures by (a) thermally treating the halide-containing nitrile mixture, (b) subsequently adding a base to the thermally treated nitrile mixture and (c) subsequently separating off the base from the nitrile mixture. Amines are prepared by (A) reacting alkyl halides with metal cyanides in an at least two-phase reaction medium in the presence of halide-containing phase-transfer catalysts to give alkanenitriles, (B) separating off the resulting halide-containing alkanenitrile mixture phase and (C) further treating the halide-containing alkanenitrile mixture phase, as described in the stages (a)-(c) removing halides from halide-containing nitrile mixtures and (d) hydrogenating nitrites obtained in stage (c) to give amines, in the presence of suspended or fixed-bed catalysts.