Method for preparing sodium bicarbonate and hydrogen chloride

US4320106A · kind A · utility

Assignee

• Chemische Werke Huels Aktiengesellschaft · US

Inventors

• Bernhard Hentschel · Cologne, DE
• Jurgen Ziebarth · Marl, DE
• Alfred Coenen · Marl, DE
• Kurt Kosswig · Marl, DE
• Ferdinand v. Praun · Haltern, DE

Key dates

• Filing date: Oct 23, 1980
• Grant date: Mar 16, 1982
• Expiry date: Oct 23, 2000

Classification

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

Abstract

A process for preparing sodium bicarbonate and hydrogen chloride by reacting an aqueous sodium chloride solution with carbon dioxide under pressure in the presence of an amine and of an organic solvent. PA0 1. Carbon dioxide is introduced under a pressure of PA1 8-80 bars into a mixture essentially containing PA1 1.1 an aqueous sodium chloride solution, PA1 1.2 a tertiary amine, PA1 1.3 a non-polar organic solvent, and PA1 1.4 a polar, organic solvent having a boiling point above 140.degree. C., PA0 2. the aqueous and organic phases obtained are separated under the same pressure as step 1, PA0 3. the aqueous phase is rid of the precipitated sodium bicarbonate and following reconcentration with sodium chloride is fed back into process stage 1 (carbonization), PA0 4. the organic phase(s) containing the polar and non-polar organic solvents is (are) heated and the hydrogen chloride released is evacuated, and PA0 5. the tertiary amine, polar and non-polar organic solvents from step 4 are recirculated in step 1. The tertiary amine used is an N-alkyl-azacycloalkane with a total of at least 14 C atoms having the general formula ##STR1## wherein n is an integer from 4 to 12, R is an alkyl g…