Purification of .alpha.-, .beta.- or .gamma.-substituted carboxylic acids

US5965032A · kind A · utility

Assignee

• BASF SE

Inventors

• Markus Frede · Eppelheim, DE
• Christian Dully · Ludwigshafen, DE
• Klaus Ditrich · Neheim, DE
• Johann-Peter Melder · Schifferstadt, DE
• Hans-Jurgen Weyer · Frankenthal (Pfalz), DE
• Achim Weitze · Brunsbüttel, DE

Key dates

• Filing date: Jan 27, 1998
• Grant date: Oct 12, 1999
• Expiry date: Jan 27, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/42
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The process for purifying an .alpha.-, .beta.- or .gamma.-substituted carboxylic acid or a salt or an ester thereof or a mixture of two or more thereof from an aqueous solution which contains an .alpha.-, .beta.- or .gamma.-substituted carboxylic acid or a salt or an ester thereof or a mixture of two or more thereof and at least one polyol or at least one amino alcohol, wherein the solution is treated by electrodialysis.