Process for preparing acrylic acid using an alkali metal-free and alkaline earth metal-free zeolitic material

US9540305B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Andrei-Nicolae Parvulescu · Ludwigshafen am Rhein, DE
• Armin LANGE DE OLIVEIRA · Heidelberg, DE
• Stephan Schunk · Heidelberg, DE
• Nicolai Tonio Woerz · Darmstadt, DE
• Marco Hartmann · Jockgrim, DE
• Kazuhiko Amakawa · Kure, JP
• Michael Hugo GOEBEL · Mannheim, DE
• Yong Liu · Dalian, CN
• Michael Lejkowski · Neckargemünd, DE

Key dates

• Filing date: May 28, 2015
• Grant date: Jan 10, 2017
• Expiry date: May 28, 2035

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2529/85
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for preparing acrylic acid, comprising (i) providing a stream S4 comprising a formaldehyde source and acetic acid; (ii) contacting stream S4 with an aldol condensation catalyst comprising a zeolitic material comprising aluminum in the framework structure to obtain a stream S6 comprising acrylic acid, the framework structure of the zeolitic material in (ii) comprising YO2 and Al2O3, and Y being a tetravalent element; where the total content of alkali metal and alkaline earth metal in the zeolitic material in (ii), calculated as alkali metal oxide and alkaline earth metal oxide, is from 0% to 0.1% by weight, based in each case on the total weight of the zeolitic material, and where the aldol condensation catalyst in (ii) comprises, outside the framework structure of the zeolitic material present therein, from 0% to 1% by weight of vanadium, based on vanadium as vanadium(V) oxide.