Basf Se Corporation

Marco Hartmann

Nicolai Tonio Woerz

Tim Blaschke

Michael Ludwik Lejkowski

Lukas Schulz

Ortmund Lang

Christian Raith

Marta Zajaczkowski-Fischer

Yong Liang Liu

Andrei-Nicolae Parvulescu

Armin Lange De Oliveira

Johannes Lieberknecht

Kazuhiko Amakawa

Till Christian Brueggemann

Yong Liu

Ulrich Mueller

Wolfgang Fischer

Klaus Joachim Mueller-Engel

Rocco Paciello

Stephan Andreas Schunk

Klaus Joachim Müller-Engel

Michael Goebel

Nicolai Tonio Wörz

Cornelia Katharina Dobner

Mathias Feyen

Peter Zurowski

Feelly Ruether

Frank Huetten

Marek Pazicky

Yan Li

Philipp Gruene

Raphael Heinrich Brand

The invention relates to a process for dehydrating aqueous 3-hydroxypropionic acid to acrylic acid in the liquid phase, wherein aqueous acrylic acid is removed continuously from the liquid phase and the aqueous 3-hydroxypropionic acid and/or the liquid phase have a high content of oligomeric 3-hydroxypropionic acid.

Method of dehydrating 3-hydroxypropionic acid to form acrylic acid

The invention relates to a process for dehydrating aqueous 3-hydroxypropionic acid to acrylic acid, wherein an aqueous mixture of 3-hydroxypropionic acid and oligomeric 3-hydroxypropionic acid is converted to acrylic acid in the liquid phase in a first step and aqueous acrylic acid is distilled out of the liquid phase, and the aqueous acrylic acid is separated by distillation into an acrylic acid-rich phase and a water-rich phase in a second step.

Method for the continuous dehydration of 3-hydroxypropionic acid to form acrylic acid

The invention relates to a process for preparing acrylic acid from formaldehyde and acetic acid, comprising

Process for preparing acrylic acid from formaldehyde and acetic acid

A process for preparing acrylic acid from formaldehyde and acetic acid, is performed by (i) providing a gaseous stream S1 comprising formaldehyde, acetic acid, oxygen and water, where the formaldehyde content of stream S1 is in the range from 8% to 18% by volume, based on the total volume of stream S1, the ratio of the volumes of acetic acid to formaldehyde is in the range from 0.6:1 to 1.1:1, and the molar ratio of oxygen to the total amount of organic carbon is in the range from 0.02:1 to 0.15:1; and (ii) contacting stream S1 with an aldol condensation catalyst in a reaction zone to obtain a gaseous stream S2 containing acrylic acid.

Process for preparing acrylic acid

The invention relates to a process for dehydrating aqueous 3-hydroxypropionic acid to acrylic acid in the liquid phase, wherein aqueous acrylic acid is removed continuously from the liquid phase and the liquid phase comprises an inert organic solvent 1.

Method for the dehydration of 3-hydroxypropanoic acid to form acrylic acid

A process for preparing acrylic acid from methanol and acetic acid, comprising (i) contacting a gaseous stream Scomprising methanol, oxygen and inert gas with an oxidation catalyst to obtain a gaseous stream Scomprising formaldehyde and inert gas; (ii) removing at least a portion of the inert gas present in Sfrom at least a portion of the formaldehyde present in Sby absorbing this formaldehyde in an absorbent to obtain a gaseous stream Scomprising the portion of the inert gas removed, and to obtain a stream Scomprising absorbent and absorbate comprising formaldehyde; (iii) optionally removing a portion or the entirety of the absorbent present in stream S, such that a stream Sremains from stream S, and producing a stream Sfrom at least stream Sor stream Sand a stream Scomprising acetic acid; and (iv) contacting stream Sin gaseous form with an aldol condensation catalyst to obtain a gaseous stream Scomprising acrylic acid.

Process for preparing acrylic acid from methanol and acetic 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

A process for obtaining acrylic acid, comprising (a) providing a liquid stream S7 comprising acetic acid and acrylic acid, where the molar ratio of acetic acid to acrylic acid in stream S7 is greater than 1:1, (b-1) crystallizing a portion of the acetic acid present in stream S7 to obtain solid crystallized acetic acid in its mother liquor, (b-2) separating the mother liquor from the acetic acid crystallized in (b-1) to obtain the solid crystallized acetic acid and a liquid stream S8 comprising acrylic acid and acetic acid, (c) separating stream S8 into at least one stream S10 depleted of acrylic acid compared to S8 and a stream S11 enriched in acrylic acid compared to S8.

Process for obtaining acrylic acid

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

Process for preparing a vinylidenecarboxylic acid or ester thereof, wherein a reaction gas comprising gaseous formaldehyde, molecular oxygen and an alkycarboxylic acid or ester thereof is brought into contact with a solid catalyst whose active composition comprises a vanadium-phosphorus oxide having an average oxidation state of vanadium of from +4.40 to +5.0 to give a product gas comprising the vinylidenecarboxylic acid or ester thereof.

Process for preparing vinylidenecarboxylic acid (ester)s by reaction of formaldehyde with alkylcarboxylic acid (ester)s

A process for preparing acrylic acid from ethylene oxide and carbon monoxide, in which ethylene oxide is carbonylated in an aprotic solvent with carbon monoxide in the presence of a cobalt catalyst system to give poly-3-hydroxypropionate, the cobalt content in the poly-3-hydroxypropionate formed is reduced with the aid of water and/or an aqueous solution as a precipitation and/or wash liquid, and the poly-3-hydroxypropionate is subsequently split by thermolysis to give acrylic acid.

Process for preparing acrylic acid from ethylene oxide and carbon monoxide

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Woerth, Germany

Marco Hartmann