Abstract
The present paper presents a process of purification of residual waters coming from the manufacture of acrylonitrile with recovery of cyanhydrines. This process consists in separating cyanhydrines in a watery concentrate through superheat-expansion-condensation and alkaline split, respectively, in sodium cyanide and in carbonylic constituent. Carbonylic constituent is successively separated by steamed dragging in order to avoid some methods of minor importance.
Cuvinte cheie
residual waters
decomposition of lactonitrile
superheating and expanding
alkaline split