Process for working up effluent containing ammonium sulphate

US4292043A · kind A · utility

Assignee

• Bayer Antwerpen · BE

Inventors

• Gabriel Denecker · Kalmthout, BE
• Domien Sluyts · Stabroek, BE
• Roland Putseys · Kalmthout, BE
• Willy Van Herck · Bad Neuenahr-Ahrweiler, DE
• Ludo Claes · Brasschaat, BE
• Georg Spott · Krefeld, DE

Key dates

• Filing date: Jan 21, 1980
• Grant date: Sep 29, 1981
• Expiry date: Jan 21, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C02F2101/16
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

A process for the working up of ammonium sulphate-containing effluent which is contaminated with organic compounds and optionally also ammonium nitrate, comprising evaporating the effluent to produce water vapor which is removed, a concentrated liquid and a crystal suspension, thickening the suspension to obtain solid ammonium sulphate which is removed and liquid which is recycled to an earlier stage, subjecting the concentrated liquid from evaporation to an optional vacuum cooling crystallization to obtain water vapor which is removed and a crystal suspension from which a concentrated liquid is separated off, advancing the concentrated liquid from the evaporation stage or from the vacuum cooling crystallization stage to a crystallizer, introducing ammonia into the crystallizer to decrease the solubility of the ammonium sulphate, thickening the ammoniacal crystal suspension to obtain ammonium sulphate solids which are removed and ammoniacal mother liquor which is advanced to a distillation step for recovery of ammonia.