Basf Se Corporation

Yong Liu

Andrei-Nicolae Parvulescu

Nicolai Tonio Woerz

Michael Ludwik Lejkowski

Kazuhiko Amakawa

Armin Lange De Oliveira

Marco Hartmann

Michael Goebel

Ulrich Mueller

Martin Dieterle

Stephan Andreas Schunk

Christian Walsdorff

Mathias Feyen

Johannes Lieberknecht

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

Process for preparing acrylic acid

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 YOand AlO, 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.

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

The present invention relates to a process for preparing acrylic acid comprising (i) providing a stream comprising a formaldehyde source and acetic acid and (ii) contacting this stream with an aldol condensation catalyst comprising a zeolitic material, wherein the framework structure of the zeolitic material in (ii) includes Si and O, and has a molar Al:Si ratio of 0:1 to 0.001:1, and wherein the framework structure of the zeolitic material in (ii), in addition to Si and any Al, comprises one or more elements selected from the group consisting of tetravalent elements Y other than Si and trivalent elements X other than Al.

Process for preparing acrylic acid using an aluminum-free zeolitic material

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Limburgerhof, Germany

Yong Liu