Process for working up reaction gases during the oxidation HCI to chlorine

US6387345B1 · kind B1 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Fritz Gestermann · Leverkusen, DE
• Jürgen Schneider · Kirchzarten, DE
• Hans-Ulrich Dummersdorf · Leverkusen, DE
• Helmut Harle · Leverkusen, DE
• Franz-Rudolf Minz · Dormagen, DE
• Helmut Waldmann · Leverkusen, DE

Key dates

• Filing date: Sep 17, 1996
• Grant date: May 14, 2002
• Expiry date: Sep 17, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B7/0743
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

In the process for working up the reaction gas consisting of chlorine, hydrogen chloride, oxygen and water vapour produced in a chlorine reactor, the reaction gas leaving the reactor 1 is first cooled until the water of reaction and hydrogen chloride condense in the form of concentrated hydrochloric acid. The concentrated hydrochloric acid is then separated from the reaction gas in a phase separation column 3 and discharged. The remaining reaction gas, from which the substantial proportion of the water and a proportion of the hydrogen chloride has been removed, is then post-dried in a drying tower 6. The post-dried reaction gas consisting of chlorine, oxygen and hydrogen chloride is then compressed to 1 to 30 bar by a compressor 7. In the subsequent stage, the compressed reaction gas is passed through a cooled chlorine recuperator 8, wherein the chlorine is very largely liquefied. Finally, the components of the reaction gas which could not be condensed in the chlorine recuperator 8 are at least partially returned to the reactor 1.