Basf Aktiengesellschaft

Basf Se Corporation

Basf Magnetics Gmbh

Ulrich Jaeger

Volker Schliephake

Steffen Rissel

Sylke Haremza

Ulrich Hammon

Juergen Schroeder

Peter Zurowski

Klaus Joachim Mueller-Engel

Volker Diehl

Thorsten Friese

Tobias Johannes Korn

Harald Keller

Frank Hoefer

Till Blum

Gerhard Wagenblast

Erich Beck

Jochen Petzoldt

Claus Hechler

Ortmund Lang

Joerg Heilek

Klaus D Schomann

Helmut Steininger

Helmut Kopke

Gunter Lipowsky

Michael Karcher

Cedric Dieleman

Virginie Bette

Hans-Peter Schildberg

Imke Britta Mueller

Travis Carline

Christopher Fuchs

Darryl Welch

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 continuous process for preparing (meth)acrylates of C-alcohol mixtures by reaction of glacial (meth)acrylic acid with an isomer mixture of C-alcohols composed of 2-propylheptanol as the main isomer and at least one of the C-alcohols 2-propyl-4-methylhexanol, 2-propyl-5-methylhexanol, 2-isopropylheptanol, 2-isopropyl-4-methylhexanol, 2-isopropyl-5-methylhexanol and/or 2-propyl-4,4-dimethylpentanol, and the use of a diester of dicarboxylic acids which have been esterified with N-oxyl-containing compounds as polymerization inhibitors in such a process.

[object Object]

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 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

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

A separating column containing a sequence of mass transfer trays that are supported by at least one covered double-T support and/or covered U-shaped support.

Thermal separating process

In process for cleaning tray columns which are used for the purposes of rectifiying liquids comprising (meth)acrylic compounds, a basic liquid is conveyed downward through the tray column and a gas is passed through the column in countercurrent to the basic liquid at an average gas phase differential pressure over all trays of at least 0.5 mbar/tray.

Cleaning of tray columns which have been used for rectificatively treating liquids comprising (meth)acrylic acid and/or esters thereof

(Meth)acrylic monomers are separated by a thermal separation process by ascending at least one ascending gaseous stream in a separating column containing a sequence of mass transfer trays and a liquid stream that contains dissolved polymerization inhibitor which descends in the separating column, and in at least one of the streams being (meth)acrylic monomers; and spraying the inner surface of the separating column with the descending liquid stream that contains the dissolved polymerization inhibitor, and the separating column having internals, certain areas of which are shadow regions of the sprayed descending liquid stream; and which shadow regions are equipped by covering means which prevent contact of the shadow regions with (meth)acrylic monomers and consequently undesired polymerization of monomer.

A process for preparing and/or working up mixtures by (meth)acrylic acid and/or (meth)acrylic ester in the presence of at least one polymerization inhibitor and at least one oxygenous gas, which comprises metering in at least part of the oxygenous gas at an exit rate of at least 50 mm/s.

Preparation of (METH) acrylic acid and (METH) acrylic esters

A magnetic recording medium comprises a nonmagnetic substrate and at least one ferromagnetic metal layer applied thereon and a protective layer formed on this metal layer and consisting of a compound which consists of an unfluorinated or partially fluorinated alkyl radical and a disulfide, hydroxyl or keto group.

Magnetic recording medium

Polyurethane vinyl ethers are obtainable by reacting

Polyurethane vinyl ethers

Growing community of inventors

Roemerberg, Germany

Ulrich Jaeger