Process for preparing sodium bicarbonate and hydrogen chloride

US4321247A · kind A · utility

Assignee

• Chemische Werke Huels Aktiengesellschaft · US

Inventors

• Alfred Coenen · Marl, DE
• Kurt Kosswig · Marl, DE
• Ferdinand v. Praun · Haltern, DE
• Hans Regner · Marl, DE

Key dates

• Filing date: Oct 3, 1980
• Grant date: Mar 23, 1982
• Expiry date: Oct 3, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01D7/16
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process for producing sodium bicarbonate and hydrogen chloride by reacting an aqueous sodium chloride solution with carbon dioxide in the presence of an amine and an organic solvent. The steps of the process are carried out, wherein: PA0 (1) carbon dioxide is introduced into a mixture containing essentially PA1 (1.1) an aqueous sodium chloride solution, PA1 (1.2) a tertiary amine, and PA1 (1.3) a polar, organic solvent; PA0 (2) the aqueous and organic phases so obtained are separated; PA0 (3) the aqueous phase freed from the separated sodium bicarbonate following reconcentration with sodium chloride is fed back into process stage 1 (carbonization stage); PA0 (4) the organic phase (s) (is) are separated from the polar organic solvent and possibly of water to the widest possible extent and/or required; and PA0 (5) the residue containing a non-polar solvent is heated and the hydrogen chloride is removed.