Recycling of ionic liquids produced in extractive distillation

US7485208B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• York Alexander Beste · Mannheim, DE
• Hartmut Schoenmakers · Heidelberg, DE
• Wolfgang Arlt · Hohen Neuendorf, DE
• Matthias Seiler · Soest, DE
• Carsten Jork · Berlin, DE

Key dates

• Filing date: Jul 15, 2004
• Grant date: Feb 3, 2009
• Expiry date: Jul 15, 2024

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S203/20
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Process for working up a bottom stream wherein high boilers and ionic liquid from an extractive rectification in which the ionic liquid is used as entrainer. The process includes feeding the bottom stream to an evaporation stage which is operated at a pressure of less than 500 mbar or to a stripper which is operated through use of inert gas or steam, and the major part of the high boiler present is separated off in vapor form from the ionic liquid.