Basf Se Corporation

Basf Aktiengesellschaft

T & R Engineering Gmbh

Thorsten Friese

Volker Schliephake

Sylke Haremza

Steffen Rissel

Till Blum

Klaus Joachim Mueller-Engel

Tobias Johannes Korn

Ulrich Hammon

Achim Stammer

Markus Siegert

Eckhard Stroefer

Jochen Petzoldt

Klaus Joachim Müller-Engel

Hans Hasse

Andreas Raichle

Thomas Ostrowski

Peter Zurowski

Ulrich Jaeger

Neven Lang

Joerg Heilek

Ulrich Cremer

Jörg Heilek

Eckhard Ströfer

Friedrich-Georg Martin

Michael Jödecke

Michael Blechschmitt

Bernd Gerber

Imke Britta Mueller

Sergej Blagov

Ulrich Jäger

Thomas Grützner

Klaus Bott

Matthias Schopohl

Jürgen Paschold

Renata Jovanovic

Marcus Bechtel

Michael Ott

Rüdiger Tüshaus

Peter Rössler

Darryl Welch

Christopher Fuchs

Travis Carline

Imke Britta Müller

Hans Volkmar Schwarz

Vinit Chilekar

Eckard Schauß

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

Processes are disclosed comprising: (a) reacting an aqueous formaldehyde solution in a reactor in the presence of a suitable catalyst to obtain a reaction product mixture comprising trioxane, formaldehyde and water; (b) distilling the reaction product mixture to form a top stream comprising crude trioxane; and (c) treating the top stream in one or more additional stages to form pure trioxane; wherein an aqueous sidestream is drawn off during the distilling of the reaction mixture.

Trioxane production method wherein a side aqueous flow is deducted at a first distillation stage

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 starting-up a heterogeneously catalyzed partial gas phase oxidation of acrolein to acrylic acid or of methacrolein to methacrylic acid over a fixed catalyst bed disposed in a tube bundle reactor cooled by a heat exchange medium, wherein the temperature of the heat exchange medium is &#x2267;290&#xb0; C. and the temperature of that reactor plate surface which faces the reaction gas entry mixture and the temperature of the reaction gas entry mixture itself are &#x2266;285&#xb0; C.

Process for starting-up a heterogeneously catalyzed partial gas phase oxidation of acrolein to acrylic acid or of methacrolein to methacrylic acid

A fabric packing has a plurality of layers made of a filament of metal or plastic and includes bulges for maintaining the fabric layers at a distance. The bulges have first protuberances of generally trough-shaped configuration and second protuberances formed on the first protuberances, thereby defining respective apexes. The second protuberances are sized smaller than the first protuberances, wherein neighboring fabric layers are supported on one another via the second protuberances.

Fabric packing

A process for removing trioxane from a use stream I of formaldehyde, trioxane and water, by

Method for separating trioxane from a trioxane/formaldehyde/water mixture by means of pressure change rectification

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Mannheim, Germany

Thorsten Friese