Basf Se Corporation

Tim Blaschke

Marco Hartmann

Ortmund Lang

Christian Raith

Marta Zajaczkowski-Fischer

Nicolai Tonio Woerz

Lukas Schulz

Nicolai Tonio Wörz

Ulrich Hammon

Claus Hechler

Ulrich Cremer

Feelly Ruether

Frank Huetten

Yan Li

Michael Schafranka

A process for continuously preparing a butyl acrylate HC&#x2550;CH&#x2014;C(&#x2550;O)OR, with R=n-butyl or isobutyl, wherein aqueous 3-hydroxypropionic acid is converted under dehydrating and esterifying conditions in the presence of the corresponding butanol R&#x2014;OH in a reactor with a rectification column and butyl acrylate formed, unconverted butanol and water used and formed are distilled off overhead as a ternary azeotrope, after separation into a liquid aqueous phase and liquid organic phase each of the aqueous and organic phases is at least partly discharged, and the organic phase comprising the butyl acrylate and the butanol is subjected to distillative separation.

Process for continuously preparing n-butyl acrylate or isobutyl acrylate

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 crossflow tray for a mass transfer column () in which a gas is conducted in countercurrent to a liquid, the crossflow tray () having passage orifices () for the gas and at least two downcomers (), the downcomers () projecting beyond the top surface of the crossflow tray () and a collecting cup () being disposed beneath each downcomer (). The downcomer () projects into the collecting cup (), the minimum horizontal cross-sectional area of the collecting cup () is 1.2 to 4 times greater than the horizontal cross-sectional area of the downcomer () at the outlet, and the collecting cup () has a circumferential wall () having an overflow (). The invention further relates to a mass transfer column comprising the crossflow trays and to a use of the mass transfer column.

Crossflow tray for a mass transfer column, mass transfer column and use of the mass transfer column

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 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 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.

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Stuttgart, Germany

Tim Blaschke