Method for producing chlorine

US8097232B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Martin Sesing · Waldsee, DE
• Armin Diefenbacher · Germersheim, DE
• Hartwig Voss · Bischofswerda, DE
• Olga Schubert · Ludwigshafen, DE
• Lothar Seidemann · Ludwigshafen am Rhein, DE
• Martin Karches · Neustadt, DE
• Thomas Grassler · Schifferstadt, DE
• Eckhard Stroefer · Mannheim, DE

Key dates

• Filing date: Feb 20, 2006
• Grant date: Jan 17, 2012
• Expiry date: Jul 2, 2027

Classification

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

Abstract

A catalytic process for preparing chlorine from hydrogen chloride, which includes recycle of process streams with reduced accumulation of inert gases in the system is provided. The process includes a step wherein a compressed liquid stream comprising chlorine, carbon dioxide and oxygen is recycled into a column countercurrent to the ascending gas phase and feeding part of the chlorine-rich liquid phase leaving the bottom of the column back into the top of the column. Carbon dioxide present in the ascending gas stream is dissolved out of the gas stream and can later be separated from chlorine without problems by distillation.