Basf Aktiengesellschaft

Basf Se Corporation

Hoechst Research & Technology Deutschland Gmbh & Co. Kg

Hoechst Aktiengesellschaft

Aventis Research & Technologies Gmbh & Co Kg

Celanese Chemicals Europe Gmbh

Hoecht Ag

Targar Gmbh

Holger Borchert

Rolf-Hartmuth Fischer

Alexander Weck

Stephan Schlitter

Andreas Raichle

Markus Rösch

Michael Hesse

Uwe Dingerdissen

Klaus Joachim Mueller-Engel

Nils Bottke

Markus Schubert

Ralf-Thomas Rahn

Ulrich Cremer

Jens Weiguny

Gunther Windecker

Christian Walsdorff

Gunnar Heydrich

Frank Stein

Josef Macht

Catharina Horstmann

Cornelia Katharina Dobner

Thomas Gerdau

Ulrich Hammon

Frank Rosowski

Klaus Joachim Müller-Engel

Gerhard Cox

Hagen Wilmer

Knut Eger

Cathrin Alexandra Welker-Nieuwoudt

Stefan Lipp

Rolf Pinkos

Gerd Kaibel

Jürgen Zühlke

Marco Bosch

Thorsten Johann

Jens Uwe Faust

Ralf Streibert

Markus R&ouml;sch

Andrey Karpov

Hermann Petersen

Michael Jolyon Sprague

Christian Bartosch

Ranier Roesky

Michael Krämer

Philipp Grüne

Marco Oskar Kennema

Marcelo Daniel Kaufman Rechulski

Andreas Lehr

Rainer Roesky

Daniela Rieck

Jacob Cornelis Van Dorland

Horst Strahberger

Mauricio Grobys

Tobias Weinland

Christian Almer

Jürgen ZÜHLKE

The invention relates to a shaped catalyst body in the form of a tetralobe having four circular through-passages, with the midpoints of the through-passages forming a square and the spacings between in each case two adjacent through-passages being from 0.8 to 1.2 times the thickness of the outer walls of the through-passages. The shaped catalyst body is used for the oxidation of S02 to S03.

Shaped catalyst body in the form of tetralobes of uniform wall thickness

The invention relates to shaped catalyst bodies for the oxidation of SOto SO, which comprise vanadium, at least one alkali metal and sulfate on a silicon dioxide support material, wherein the shaped body has the shape of a cylinder having 3 or 4 hollow-cylindrical convexities, obtainable by extrusion of a catalyst precursor composition comprising vanadium, at least one alkali metal and sulfate on a silicon dioxide support material through the opening of an extrusion tool, wherein the opening of the extrusion tool has a cross section formed by 3 or 4 partly overlapping rings whose midpoints lie essentially on a circular line having a diameter of y, wherein the rings are bounded by an outer line lying on a circle having an external diameter x1 and an inner line lying on a circle having an internal diameter x2.

[object Object]

A hollow cylindrical shaped catalyst body for gas phase oxidation of an alkene to an &#x3b1;,&#x3b2;-unsaturated aldehyde and/or an &#x3b1;,&#x3b2;-unsaturated carboxylic acid comprises a compacted multimetal oxide having an external diameter ED, an internal diameter ID and a height H, wherein ED is in the range from 3.5 to 4.5 mm; the ratio q=ID/ED is in the range from 0.4 to 0.55; and the ratio p=H/ED is in the range from 0.5 to 1. The shaped catalyst body is mechanically stable and catalyzes the partial oxidation of an alkene to the products of value with high selectivity. It provides a sufficiently high catalyst mass density of the catalyst bed and good long-term stability with acceptable pressure drop.

Mechanically stable hollow cylindrical shaped catalyst bodies for gas phase oxidation of an alkene to an unsaturated aldehyde and/or an unsaturated carboxylic acid

What is described is a catalyst for preparation of an &#x3b1;,&#x3b2;-unsaturated carboxylic acid by gas phase oxidation of an &#x3b1;,&#x3b2;-unsaturated aldehyde, comprising a shaped support body with an active composition applied thereto, wherein the active composition coverage q is at most 0.3 mg/mm, where Q is the active composition content of the catalyst in % by weight and Sis the specific geometric surface area of the shaped support body in mm/mg. Also described are a process for preparing the catalyst and a process for preparing an &#x3b1;,&#x3b2;-unsaturated carboxylic acid by gas phase oxidation of an &#x3b1;,&#x3b2;-unsaturated aldehyde over a fixed catalyst bed comprising a bed of the catalyst. The catalyst, with constantly high conversion of acrolein, reduces overoxidation to COand increases the selectivity of acrylic acid formation.

Catalyst for preparation of an unsaturated carboxylic acid by gas phase oxidation of an unsaturated aldehyde

A process for producing geometric shaped catalyst bodies K whose active material is a multielement oxide of stoichiometry[BiWO][MoZZFeZZZO],in which a finely divided oxide BiWOwith the particle size dand, formed from element sources, a finely divided intimate mixture of stoichiometry MoZZFeZZZwith the particle size dare mixed in a ratio of a:1, this mixture is used to form shaped bodies and these are treated thermally, where (d)&#xb7;(d)&#xb7;(a)&#x2267;820. A shaped catalyst body obtained by the process. A catalyst obtained by grinding the shaped catalyst body. A process for heterogeneously catalyzing the partial gas phase oxidation of an alkane, alkanol, alkanal and/or an alkenal of 3 to 6 carbon atoms using the catalyst.

Process for producing geometric shaped catalyst bodies

A process for producing a ringlike oxidic shaped body by mechanically compacting a pulverulent aggregate introduced into the fill chamber of a die, wherein the outer face of the resulting compact corresponds to that of a frustocone.

Process for producing a ringlike oxidic shaped body

A process for producing geometric shaped catalyst bodies K whose active material is a multielement oxide of stoichiometry[BiWO][MoZZFeZZZO],in which a finely divided oxide BiWOwith the particle size dand, formed from element sources, a finely divided intimate mixture of stoichiometry MoZZFeZZZwith the particle size dare mixed in a ratio of a:1, this mixture is used to form shaped bodies and these are treated thermally, where (d)&#xb7;(d)&#xb7;(a)&#x2267;820.

A process for producing geometric shaped catalyst bodies K whose active material is a multielement oxide which comprises the element Mo, the elements Bi and/or V and one or more of the elements Co, Ni, Fe, Cu and alkali metals, in which sources of the different elements are used to obtain a finely divided mixture which is coarsened to a powder by press agglomeration, the coarsened powder is used to form, by press agglomeration, shaped bodies V which are separated into undamaged shaped bodies Vand into damaged shaped bodies V, the undamaged shaped bodies Vare converted by thermal treatment to the shaped catalyst bodies K, and the damaged shaped bodies Vare comminuted and recycled into the obtaining of the finely divided mixture.

Process for continuously producing geometric shaped catalyst bodies K

A process for charging a reactor with a fixed catalyst bed which comprises at least one annular shaped support catalyst body K, in which, before the charging, fragments formed in the preparation of the shaped catalyst bodies K are removed by screening.

Process for charging a reactor with a fixed catalyst bed which comprises at least annular shaped catalyst bodies K

A process for preparing a multielement oxide composition comprising the element iron in oxidic form, in which the source of the elemental constituent of iron used is an aqueous iron nitrate solution whose preparation comprises the melting of a solid hydrate of iron nitrate.

Process for preparing a multielement oxide composition comprising the element iron in oxidic form

A process for introducing annular coated catalysts K into a reaction tube of a tube bundle reactor, in which adhering pairs of annular coated catalysts K formed in the preparation of the annular coated catalysts K, before the introduction thereof into the reaction tube, are removed at least partly from the annular coated catalysts K.

Process for introducing a portion withdrawn from at least one production charge of annular coated catalysts K into a reaction tube of a tube bundle reactor

Crude water-containing tetrahydrofuran is purified by passing the crude tetrahydrofuran through three distillation columns, withdrawing water from the bottom of the first column, recycling water-containing tetrahydrofuran from the top of the second column into the first column, passing a sidestream of the first column into the second column, recycling the bottom product of the third column into the first column, and withdrawing a distillate at the top of the first column. Additionally, a sidestream of the second column is passed into the third column and the purified tetrahydrofuran is recovered as the top product of the third column.

Method for purifying tetrahydrofuran by distillation

A catalyst for the hydrogenation of C-dicarboxylic acids and/or derivatives thereof, preferably maleic anhydride, in the gas phase comprises

Method for the selective production of tetrahydrofuran by hydrogenating maleic acid anhydride

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Offstein, Germany

Holger Borchert