| 摘要 |
A process for the recovery and purification of acrylonitrile from an aqueous solution of acrylonitrile, acetonitrile, HCN and impurities, comprising the steps of: (a) distilling the aqueous solution in an extractive distillation column with solvent water to produce an overhead stream of acrylonitrile, HCN and water, and a bottoms stream of water and impurities, and (b) distilling the overhead stream of (a) in one or more distillation columns to recover acrylonitrile, characterised in that the bottoms stream of (a) is passed in indirect heat exchange relationship with one or more additional columns to provide heat for distillation. o |
