Process for preparing acrylic acid

US9695099B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Yong Liu · Dalian, CN
• Martin Dieterle · Ludwigshafen, DE
• Nicolai Tonio Woerz · Darmstadt, DE
• Andrei-Nicolae Parvulescu · Ludwigshafen am Rhein, DE
• Michael Lejkowski · Neckargemünd, DE
• Johannes Lieberknecht · Schifferstadt, DE
• Christian Walsdorff · Ludwigshafen, DE
• Kazuhiko Amakawa · Kure, JP

Key dates

• Filing date: Dec 2, 2015
• Grant date: Jul 4, 2017
• Expiry date: Dec 2, 2035

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/584
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for preparing acrylic acid from acetic acid and formaldehyde, which comprises (a) provision of a stream S1 comprising acetic acid and formaldehyde, where the molar ratio of acetic acid to formaldehyde in the stream S1 is in the range from 0.5:1 to 2:1; (b) contacting of the stream S1 with an aldol condensation catalyst comprising vanadium, phosphorus and oxygen to give a stream S2 comprising acrylic acid, where, in (b), the space velocity WHSV is in the range from 0.35 to 7.0 kg/kg/h.