Basf Aktiengesellschaft

Basf Se Corporation

Basfaktiengesellschaft

Baf Aktiengesellschaft

Volker Schliephake

Ulrich Hammon

Klaus Joachim Mueller-Engel

Sylke Haremza

Bernd Eck

Ulrich Jaeger

Otto Machhammer

Steffen Rissel

Till Blum

Gerhard Wagenblast

Harald Keller

Joerg Heilek

J&uuml;rgen Schr&ouml;der

Joachim Thiel

Thorsten Friese

Peter Zurowski

Ulrich Rauh

Juergen Schroeder

Klaus Joachim Müller-Engel

Heinz Friedrich Sutoris

Thomas Jaworek

Theo Proll

Tobias Johannes Korn

Jochen Petzoldt

Dieter Baumann

Frank Hoefer

J&ouml;rg Heilek

Klaus Br&ouml;llos

Klaus Bott

Rolf-Dieter Becher

Claus Hechler

Andreas Raichle

Armin Diefenbacher

Ulrich Cremer

Gunter Lipowsky

Volker Diehl

Armin Schraut

Klaus Joachim M&uuml;ller-Engel

Wolfgang Schneider

Michael Blechschmitt

Wolfgang Pies

Martin Dieterle

Georg Sieder

Jürgen Schröder

Ortmund Lang

Thomas Walter

Christoph Adami

Jörg Heilek

Friedrich-Georg Martin

Cedric Dieleman

J&uuml;rgen Decker

Knut Eger

Rainer Rahm

Virginie Bette

Piotr Makarczyk

Ulrich Jäger

Peter Schlemmer

Susanne Haupt

Imke Britta Mueller

Bernd Gerber

Ernst Lang

Wolfgang Gunkel

Travis Carline

Christopher Fuchs

Darryl Welch

Frank Höfer

Bruno Seider

Jochen Meschke

Carl-Ludwig Krüger

Imke Britta Müller

Aykan Akin

Michael Hoffmann

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 recharging the reaction tubes of a tube bundle reactor with a new fixed catalyst bed, in which a heterogeneously catalyzed partial gas phase oxidation of an organic compound had been performed beforehand in a preceding fixed catalyst bed comprising Mo-comprising multielement oxide active compositions to form a steam-comprising product gas mixture, in which, before the recharge, solid deposit which had been deposited on the tube inner walls and comprises molybdenum oxide and/or molybdenum oxide hydrate is brushed away with the aid of a brush.

Process for recharging the reaction tubes of a tube bundle reactor with a new fixed catalyst bed

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.

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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 transporting a liquid monomer phase which has been withdrawn from a storage vessel and comprises methacrylic monomers to an extent of &#x2267;90% by weight, in a tank truck or in a tanker ship, in which the liquid monomer phase is subjected to a separating operation on the route from the storage vessel into the tank of a tank truck or of a tanker ship in order to separate polymer of the monomer present in dissolved form in the liquid monomer phase.

Process for transporting in the tank of a tank truck or tanker ship a liquid monomer phase withdrawn from a storage vessel

A process for inhibiting polymerization of (meth)acrylic acid and/or (meth)acrylic esters by introducing an oxygenous gas into the (meth)acrylic acid and/or the (meth)acrylic ester, in which the (meth)acrylic acid and/or the (meth)acrylic ester has a degree of purity of at least 95% and is in the liquid state.

Process for inhibiting polymerization of (meth)acrylic acid and/or (meth)acrylic esters

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 redissociating Michael adducts which are present in a liquid F with a proportion by weight of &#x2267;10% by weight and have been formed in the preparation of acrylic acid or esters thereof in a redissociating apparatus which comprises a pump P, a separating column K with separating internals and a circulation heat exchanger UW, wherein, for the purpose of supplying the cleavage energy, the pump P sucks in bottoms liquid from the bottom space of the separating column K and, via the circulation heat exchanger UW, continually recycles it into the bottom space above the level of the bottoms liquid, and wherein the pump P is a radial circulation pump with an open impeller.

Process for redissociating Michael adducts which are present in a liquid F and have been formed in the preparation of acrylic acid or esters thereof

A process for purifying removal of a chemical target compound from a suspension of crystals thereof in mother liquor in a wash column with forced transport of the crystal bed from the top downward, in which crystals are removed from the lower end of the crystal bed with a rotating removal device and melted, and a portion of the crystal melt is conducted back toward the crystal bed as wash melt, the removal device being secured with a drive shaft conducted into the wash column from the bottom through an inlet having a seal, said drive shaft being driven about its longitudinal axis by a drive unit for rotation and being mounted so as to be rotatable about its longitudinal axis in more than one bearing, such that the mounting in one of the bearings absorbs the downward force acting on the drive shaft, the mounting in two or more bearings absorbs forces acting radially outward from the drive shaft, and the mounting in one bearing is additionally capable of absorbing an upward force acting on the drive shaft.

Process for purifying removal of a chemical target compound from a suspension of crystals thereof in mother liquor

A process for storing a monomer phase which is liquid under the conditions of storage and comprises methacrylic monomers to an extent of &#x2267;95% by weight and has been obtained by condensation out of a gaseous phase or by melting a crystalline phase, in a storage vessel, in which polymer of the monomer present in dissolved form in the liquid monomer phase is removed therefrom on the route from its generation into the storage vessel, and also a process for withdrawing liquid monomer phase from the storage vessel in which polymer of the monomer present in dissolved form in the monomer phase is likewise removed.

Process for storing a monomer phase which is liquid under the conditions of storage

A method of charging catalyst tubes of a bundle of catalyst tubes in a structured fashion, in which uniformly predispensed portions of formulations of shaped catalyst bodies are used for producing a section of charge.

Method of charging catalyst tubes of a bundle of catalyst tubes in a structured fashion

A process for continuously removing a target product X in the form of fine crystals from a liquid phase P comprising the target product X and constituents other than the target product X by cooling suspension crystallization in an indirect heat transferer, in which the crystal suspension formed is conducted out of the heat transferer first into a mixed buffer tank and, from there, fed to an apparatus for separating the crystal suspension into crystals and liquid phase, and wherein external measures dissipade the oversaturation of the crystal suspension fed to the buffer vessel with target product X.

Process for operating a continuous removal of a target product X in the form of fine crystals

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

Growing community of inventors

Schifferstadt, Germany

Volker Schliephake