Process for purifying an ionic liquid

US10138209B2 · kind B2 · utility

Assignee

• EVONIK DEGUSSA GMBH · DE

Inventors

• Matthias Bahlmann · Borken, DE
• Olivier Zehnacker · Dortmund, DE
• Markus Lütkehaus · Steinfurt, DE
• Benjamin Willy · Goldkronach, DE
• Werner Escher · Düsseldorf, DE
• Xinming Wang · Yokohama, JP
• Rolf Schneider · Burgstetten, DE
• Christoph Hiller · Dülmen, DE
• Stefan Münzner · Dorsten, DE

Key dates

• Filing date: Apr 13, 2017
• Grant date: Nov 27, 2018
• Expiry date: Apr 13, 2037

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/141
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention relates to a process for purifying an ionic liquid comprising dialkylimidazolium ions by means of stripping, wherein water vapor is used at a particular temperature. The process according to the invention is characterized in that the decomposition of the ionic liquid is minimized during the procedure of the process.