Basf Se Corporation

Frank Huetten

Markus Ottenbacher

Ulrich Hammon

Thomas Walter

Klaus Joachim Mueller-Engel

Stefanie Herzog

Thomas Daniel

Otto Machhammer

Rainer Papp

Nicolai Tonio Woerz

Stefan Altwasser

Marco Hartmann

Daniel Pfeiffer

Manfred Heilig

Tim Blaschke

Annebart Engbert Wentink

Lukas Schulz

Florian Wolff

Alexander Schaefer

A plant () for recovering acrylic acid, which includes: a absorption column (); a dissociation column (); a first line () connected to the dissociation column (); a second line () connecting the absorption column () and the dissociation column (); a third line () feeding a substream of the mother acid obtained in the crystallization into the dissociation column (); a fourth line () connecting the crystallization apparatus and the absorption column (); and a fifth line () connecting the dissociation column () and the absorption column ().

Process and plant for recovering acrylic acid

A process for recovering acrylic acid, including: a) division of a heated mother acid stream in direction of an absorption a condensation column and a dissociation column; b) feeding of a heated mother acid substream as runback to the dissociation column; c) feeding-in of at least one stripping gas stream to the dissociation column; d) feeding-in of a secondary component stream comprising oligomeric acrylic acid from the absorption column to the dissociation column; e) dissociation of part of oligomeric acrylic acid in the dissociation column to give monomeric acrylic acid; f) removal of secondary components comprised in the secondary component stream in the dissociation column; g) discharge of monomeric acrylic acid as gas mixture with introduced circulating stripping gas stream from the dissociation column; and h) feeding-in of the gas mixture to the absorption column.

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

An aqueous solution comprising acrylic acid and the conjugate base thereof in a total amount of at least 10% by weight, based on the weight of the aqueous solution, and propionic acid and the conjugate base thereof, formic acid and the conjugate base thereof, acetic acid and the conjugate base thereof, benzoic acid and the conjugate base thereof, maleic anhydride, maleic acid and the conjugate bases thereof, phthalic anhydride, phthalic acid and the conjugate bases thereof, acrolein, benzaldehyde, 2-furaldehyde, and at least 20 mol % of at least one alkali metal cation;

Aqueous solution comprising acrylic acid and the conjugate base thereof

A thermal separation process between a gas ascending in a separating column and a liquid descending in the separating column, which comprise (meth)acrylic monomers, wherein the separating column comprises a sequence of crossflow mass transfer trays, the crossflow mass transfer trays of which have passage orifices for the ascending gas in crossflow direction both in front of and beyond a downcomer for the descending liquid, and such crossflow mass transfer trays and one such crossflow mass transfer tray in a sequence of crossflow mass transfer trays present in a separating column.

Thermal separation process

A process for preparing acrylic acid from ethanol and formaldehyde, in which, in a reaction zone A, the ethanol is partially oxidized to acetic acid in a heterogeneously catalyzed gas phase reaction, the product gas mixture A obtained and a formaldehyde source are used to obtain a reaction gas input mixture B which comprises acetic acid and formaldehyde and has the acetic acid in excess over the formaldehyde, and the formaldehyde present in reaction gas input mixture B is aldol-condensed with acetic acid present in reaction gas input mixture B to acrylic acid under heterogeneous catalysis in a reaction zone B, and unconverted acetic acid still present along-side the acrylic acid target product in the product gas mixture B obtained is removed therefrom, and the acetic acid removed is recycled into the production of reaction gas input mixture B.

Process for preparing acrylic acid from ethanol and formaldehyde

Growing community of inventors

Mannheim, Germany

Frank Huetten