Process for the separation of dimethyl ether and chloromethane in mixtures

US5882485A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Peter Roth · Eppstein, DE
• Erhard Leistner · Solms, DE
• Hans Haverkamp · Oerlinghausen, DE
• Wolfgang Wendel · Kelkheim, DE
• Michael Kleiber · Hattersheim, DE

Key dates

• Filing date: Jun 23, 1997
• Grant date: Mar 16, 1999
• Expiry date: Jun 23, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S203/08
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for the separation of dimethyl ether and chloromethane in mixtures A process for the separation of dimethyl ether and chloromethane in mixtures by two distillation steps. In the first step, the mixture is subjected to an extractive distillation with water, aqueous salt solutions or organic liquids as extractant, the top product being chloromethane. In the second step, the dimethyl ether is separated from the extractant.