Non-precipitating regulation of ammonia content in sour gas solvent scrubbing systems

US4515760A · kind A · utility

Assignee

• Linde GmbH · DE

Inventors

• Roland Lang · Nieheim, DE
• Heinz Karwat · Pullach, DE

Key dates

• Filing date: Dec 21, 1983
• Grant date: May 7, 1985
• Expiry date: Dec 21, 2003

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D53/1412
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The NH.sub.3 content is regulated in methanol used in a process for scrubbing out sour gases from gaseous mixtures and/or for preventing ice formation prior to the scrubbing step. The methanol is freed, after the scrubbing step, respectively of absorbed gaseous components and/or water, and reused in the cycle as scrubbing liquid and/or for preventing ice formation. A strong acid is added to the methanol from water-soluble ammonium salts. Thereby, dissolved salts are formed which are removed together with water. Deleterious trace acids are also removed by an analogous treatment with a basic compound. The acid/base treatments are conducted in succession.