Basf Se Corporation

Basf Aktiengesellschaft

Peter Zurowski

Sylke Haremza

Volker Schliephake

Steffen Rissel

Ulrich Jaeger

Thorsten Friese

Klaus Joachim Mueller-Engel

Till Blum

Ulrich Hammon

Friedrich-Georg Martin

Gunter Lipowsky

Christian Raith

Wolfgang Fischer

Rocco Paciello

Juergen Schroeder

Klaus Joachim Müller-Engel

Tobias Johannes Korn

Joerg Heilek

Jörg Heilek

Frank Hoefer

Nicole Janssen

Marco Hartmann

Karolin Geyer

Christof Kujat

Nikolaus Nestle

Ann-Kathrin Marguerre

Marek Pazicky

Imke Britta Mueller

Murat Cetinkaya

Joachim Wulff-Doering

Christian Rein

Ulrich Jäger

Daher Michael Badine

Ansgar Schaefer

Eduard Schreiner

Reiner Weiler

Raphael Heinrich Brand

Frank Höfer

Travis Carline

Juergen Strasser

Tile Gieshoff

Christopher Fuchs

Darryl Welch

Imke Britta Müller

Filip Crauwels

Process for inhibiting the undesired free-radical polymerization of acrylic acid present in a liquid phase P, wherein the acrylic acid content of P is at least 10% by weight, the liquid phase P comprises in the range from 25 to 1000 ppmw of glyoxal based on the weight of the acrylic acid present in P and the liquid phase P is admixed with furfural in an amount that results in a furfural content in the range from 25 to 1000 ppmw based on the weight of the acrylic acid present in P. Liquid phase P, wherein the acrylic acid content of P is at least 10% by weight and the liquid phase P comprises in the range from 25 to 1000 ppmw of glyoxal and in the range from 25 to 1000 ppmw of furfural in each case based on the weight of the acrylic acid present in P.

Method for inhibiting unwanted radical polymerisation of acrylic acid present in a liquid phase P

A composition for the immediate stopping of a free-radical polymerization comprises a) an inhibitor for the free-radical polymerization selected from among phenothiazines, b) an aprotic solvent and c) an ionic liquid. It serves to stabilize free-radically polymerizable monomers against free-radical polymerization. For the immediate stopping of free-radical polymerizations, the composition is added to a free-radically polymerizing system.

Composition for the immediate stopping of a free-radical polymerization

A process for production of acrylic acid includes preparing a product gas mixture by a catalytic gas-phase oxidation of a Cprecursor; cooling and contacting the cooled product gas mixture in an absorption column having at least two cooling loops in countercurrent with an absorbent to obtain an absorbate A, containing the absorbent and absorbed acrylic acid; condensing a high boiler fraction of the product gas mixture in a first cooling loop; condensing a low boiler fraction of the product gas mixture in a second cooling loop; maintaining a temperature of the absorbate A in the second cooling loop at a value of at least 56&#xb0; C.; removing an acid water stream comprising glyoxal from the absorption column at a side take-off located above the second cooling loop; and removing a stream F of absorbate A from the absorption column at a side take-off, located at a height of the absorption column between the first cooling loop and the second cooling loop.

Process for production of acrylic acid

A process for inhibiting unwanted free-radical polymerization of acrylic acid present in a liquid phase P whose acrylic acid content is at least 10% by weight and which, based on the weight of the acrylic acid present therein, additionally comprises at least 100 ppm by weight of propionic acid and at least 100 ppm by weight of glyoxal, in which at least one chemical compound of the element copper is added to the liquid phase P, and the resulting liquid phases P to which a chemical compound of the element copper has been added.

Process for inhibiting unwanted free-radical polymerization of acrylic acid present in a liquid phase P

In a method of stabilizing acrylic compounds, a liquid phase containing at least one acrylic compound is mixed with at least one metal and at least one ligand. The acrylic compound can be acrylic acid, methacrylic acid, and their respective esters. The metal can be copper, manganese, and cerium. The ligand can be a quinoline compound of formula (I), an N-oxide of a compound of formula (I), 2,2&#x2033;-bis(2,3-dihydro-3-oxoindolylidene), or an aliphatic y-dentate ligand with y being 2-6 and comprising at least two nitrogen atoms joined by aliphatic or aromatic C-Cbridges comprising y-2 further coordinating nitrogen atoms or heteroatoms: where X is OH, NH, O&#x2014;(C-C)-alkyl, O&#x2014;C(O)&#x2014;(C-C)-alkyl, or O&#x2014;C(O)-phenyl; Ris H, or (C-C)-alkyl; Ris H, (C-C)-alkyl, Cl, Br, or SOH; and Ris H, Cl or Br.

Method of stabilizing polymerizable compounds

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

A process for separating acrylic acid present as a main product and glyoxal present as a by-product in a product gas mixture of a partial gas phase oxidation of a Cprecursor compound, in which a liquid phase P is obtained, which consists of acrylic acid to an extent of at least 70% of its weight and, based on the molar amount of acrylic acid present therein, comprises at least 200 molar ppm of glyoxal, in which the glyoxal is separated from the acrylic acid in the liquid phase P by crystallization.

Process for separating acrylic acid present as a main constituent and glyoxal present as a by-product in a product gas mixture of a partial heterogeneously catalyzed gas phase oxidation of a C3 precursor compound of acrylic acid

The present invention relates to a process for preparing tertiary alkyl esters of (meth)acrylic acid having at least 4 carbon atoms in the alkyl radical. The process includes reacting (meth)acrylic acid with at least one olefin of formula (I) in homogeneous phase in the presence of an acidic catalyst in a reactor, discharging the resulting reaction mixture from the reactor, separating the discharged reaction mixture into a first mixture which contains the catalyst and a second mixture which contains the tertiary alkyl ester of (meth)acrylic acid having at least 4 carbon atoms in the alkyl radical, and removing the tertiary alkyl ester of (meth)acrylic acid having at least 4 carbon atoms in the alkyl radical from the second mixture in the presence of compound S, which comprises at least one N-oxyl group and is added as a stabilizer.

Process for preparing tertiary alkyl esters of (meth)acrylic acid having at least 4 carbon atoms in the alkyl radical

A process for transferring heat to a liquid mixture comprising at least one (meth)acrylic monomer in an indirect heat exchanger, wherein a quaternary ammonium salt, a tertiary amine or a salt thereof with a Br&#xf8;nsted acid is added to the liquid mixture to reduce fouling.

Process for transferring heat to a liquid mixture comprising at least one (meth)acrylic monomer

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Landau, Germany

Peter Zurowski