Purification of carboxylic esters by extractive distillation

US8436203B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Helmut Kronemayer · Heidelberg, DE
• Ellen Dahlhoff · Schifferstadt, DE
• Andreas Lanver · Mannheim, DE

Key dates

• Filing date: Apr 15, 2011
• Grant date: May 7, 2013
• Expiry date: Aug 26, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C67/54
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

In a process for purifying carboxylic esters such as ethyl formate, a carboxylic ester to be purified is distilled in the presence of an extractant, preferably by (a) allowing vapor of the carboxylic ester to be purified to ascend in a distillation column; (b) conveying the extractant in countercurrent to the vapor in an extractive distillation column; (c) taking off pure carboxylic ester above the extractive distillation zone. The extractant is, for example, selected from among diols, polyols, open-chain or cyclic amides.