Process of isolation of (Meth) acrylic acid

US5855743A · kind A · utility

Assignee

• BASF SE

Inventors

• Holger Herbst · Bischofswerda, DE
• Ulrich Hammon · Mannheim, DE

Key dates

• Filing date: Jul 29, 1997
• Grant date: Jan 5, 1999
• Expiry date: Jul 29, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S203/22
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process is provided for the isolation of (meth)acrylic acid from a mixture containing (meth)acrylic acid as the main component and lower aldehydes as secondary components by rectification in a rectification column having a stripping section and a rectification section, wherein the starting mixture containing the (meth)acrylic acid to be isolated by rectification is not fed directly to the rectification column but is first passed into a heated dwell vessel which is connected to the vapor side of the rectification section of the rectification column and in which the starting mixture is kept at the boil and, instead of the starting mixture as such, the bottom liquid of the dwell vessel is fed to the rectification column.