Method for producing acrylic acid

US6433222B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Bernd Eck · Viernheim, DE
• Jorg Heilek · Bammental, DE
• Volker Schliephake · Schifferstadt, DE
• Theo Proll · Bad Dürkheim, DE
• Klaus Bröllos · Seeheim-Jugenheim, DE
• Otto Machhammer · Mannheim, DE
• Joachim Thiel · Neustadt, DE

Key dates

• Filing date: Jan 22, 2001
• Grant date: Aug 13, 2002
• Expiry date: Jan 22, 2021

Classification

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

Abstract

A process for the preparation of acrylic acid by:(a) preparation of a gaseous product mixture which essentially has the composition of a reaction mixture of catalytic gas-phase oxidation of C3-alkanes, C3-alkenes, C3-alkanols and/or C3-alkanals and/or intermediates thereof to acrylic acid, which comprises(b) condensation of the gaseous product mixture,(c) crystallization of the acrylic acid from the solution obtained in stage (b), with partial evaporation of the solution under reduced pressure,(d) isolation of the resulting crystals from the mother liquor,(e) recycling of at least a part of the mother liquor from stage (d) to stage (b) and(f) recycling of at least a part of the evaporated solution from stage (c) to stage (b).