Purification of acrylic acid by crystallization by means of vacuum evaporation

US6414190B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Bernd Eck · Viernheim, DE
• Jorg Heilek · Bammental, DE
• Volker Schliephake · Schifferstadt, DE

Key dates

• Filing date: Jul 21, 1999
• Grant date: Jul 2, 2002
• Expiry date: Jul 21, 2019

Classification

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

Abstract

In a process for purifying acrylic acid by crystallization by means of vacuum evaporation, a solution which contains acrylic acid and water and may contain further components is crystallized by means of vacuum evaporation with formation of a liquid phase, consisting of a mother liquor containing more than 10% by weight of water and of the crystals, and a vapor phase, the vapor phase is introduced into a liquid material in a condensation zone with formation of a liquid condensation mixture, and the liquid condensation mixture is recycled at least partly to the condensation zone, the operating conditions in the condensation zone being established so that no solid is precipitated.