Purification of crude acrylic acid by crystallization

US6063959A · kind A · utility

Assignee

• BASF SE

Inventors

• Klaus Lehnert · Hammersbach, DE
• Klaus Joachim Müller-Engel · Blankenloch, DE
• Gerhard Nestler · Ludwigshafen, DE
• Bernd Eck · Viernheim, DE

Key dates

• Filing date: Dec 30, 1998
• Grant date: May 16, 2000
• Expiry date: Dec 30, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/43
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

1,4-Dibenzothiazine-comprising crude acrylic acid is purified by crystallization by raising its diacrylic acid content to at least 1% by weight prior to the crystallization step.