Basf Aktiengesellschaft

Basf Se Corporation

Sebastian Storck

Frank Rosowski

Samuel Neto

Jürgen Zühlke

Jens Weiguny

Hartmut Hibst

Andreas Tenten

Mark Duda

Cornelia Dobner

Jens Klein

Joaquim Henrique Teles

Stephan Andreas Schunk

Christian Walsdorff

Wilhelm Ruppel

Andreas Sundermann

Dirk Demuth

Thorsten Johann

Michael Baier

Raimund Felder

Stefan Bauer

Wolfram Stichert

Hans-Josef Wolf

Beatrice Roessler

Wolfgang Rummel

Catalyst systems for preparing phthalic anhydride by means of gas-phase oxidation of o-xylene and/or naphthalene, and a process for preparing phthalic anhydride using the catalyst systems.

Three-layered, four-layered, or five-layered catalyst systems for producing phthalic anhydride

Catalytic titanium dioxide mixtures comprising: a first anatase titanium dioxide having a BET surface area greater than 15 m/g and a hydrogen uptake for the reduction of Tito Tiof from 5 to 20 &#x3bc;mol/m; and a second anatase titanium dioxide having a BET surface area less than or equal to 15 m/g and a hydrogen uptake for the reduction of Tito Tiof from 0.6 to 7 &#x3bc;mol/m, processes for preparing catalysts containing the same, catalysts containing active compositions including such titanium dioxide mixtures on support materials, and catalyst systems using the same.

Catalytic titanium dioxide mixtures, catalysts and catalyst systems containing the same, processes for making the same, and uses therefor

Three-layered or four-layered catalyst systems for producing phthalic anhydride

A process is described for producing a catalyst for gas-phase oxidations, in which a suspension of TiOand VOparticles is applied to a fluidized inert support, wherein at least 90% by volume of the VOparticles have a diameter of 20 &#x3bc;m or less and at least 95% by volume of the VOparticles have a diameter of 30 &#x3bc;m or less. The defined particle size distribution of the VOallows a high coating efficiency.

Gas phase oxidation catalyst with defined vanadium oxide particle size distribution

The present invention relates to a catalytically active composition comprising as active component The present invention further provides a process for dehydrogenating hydrocarbons, preferably oxo-functionalized hydrocarbons such as cyclopentanone, cyclohexanone and isovaleraldehyde, using the catalytically active composition.

Catalytically active composition and the use thereof in dehydration methods

A multimetal oxide of the formula I,AgQMVO*e HO,&#x2003;&#x2003;Iwhere a is from 0.3 to 1.9, Q is an element selected from among P, As, Sb and/or Bi, is from 0 to 0.3, M is a metal selected from among Nb, Ce, W, Mn, Ta, Pd, Pt, Ru and/or Rh, c is from 0.001 to 0.5, with the proviso that (a-c)&#x2267;0.1, d is a number which is determined by the valence and abundance of the elements other than oxygen in the formula I and e is from 0 to 20, and also precatalysts and catalysts produced therefrom for the partial oxidation of aromatic hydrocarbons are described.

Multimetal oxide containing silver, vanadium and a promoter metal and use thereof

The invention relates to a process for preparing phthalic anhydride, in which the catalytic gas-phase oxidation of o-xylene and/or naphthalene is carried out over at least three zones of catalysts of increasing activity, with only the last zone of the catalyst system containing phosphorus and the last zone also comprising at least 10% by weight of vanadium (calculated as VO) based on the active composition of the catalyst and having a ratio of vanadium (calculated as VO) to phosphorus of greater than 35.

Method for producing phthalic anhydride

A description is given of a process for preparing aldehydes, carboxylic acids and/or carboxylic anhydrides, in particular phthalic anhydride, in which a gaseous stream comprising an aromatic hydrocarbon and molecular oxygen is passed at elevated temperature over a bed of a first catalyst and a bed which is made up of a second catalyst having a higher activity than the first catalyst and is located downstream of the first catalyst in the flow direction of the gaseous stream, wherein the catalytically active composition of the first catalyst comprises at least vanadium oxide, titanium dioxide and antimony oxide and the ratio of vanadium, calculated as VO, to antimony, calculated as SbO, in the first catalyst is from 3.5:1 to 5:1. The source of antimony oxide used for the first catalyst is preferably particulate antimony trioxide having a mean particle size of from 0.5 to 5 &#x3bc;m. The process allows the desired oxidation products to be obtained in high yield over longer periods of time.

Production of aldehydes, carboxylic acids and/or carboxylic acid anhydrides by means of catalysts containing vanadium oxide, titanium dioxide, and antimony oxide

A catalyst is described which has a catalytically active composition which contains a phase A and a phase B in the form of three-dimensional delimited regions, wherein phase A is a silver-vanadium oxide bronze and phase B a mixed oxide phase based on titanium dioxide and vanadium pentoxide. The catalyst serves to prepare aldehydes, carboxylic acids and/or carboxylic anhydrides from aromatic or heteroaromatic hydrocarbons by gas phase oxidation.

Catalyst having a silver-vanadium oxide phase and a promoter phase

A process for preparing a vanadium, phosphorus, and oxygen catalyst precursor for preparing maleic anhydride by heterogeneously catalyzed gas-phase oxidation of a hydrocarbon having at least four carbon atoms, which comprises

Catalyst-precursor for the production of maleic acid anhydride and method for the production thereof

A process for preparing a vanadium, phosphorus, and oxygen catalyst precursor for preparing maleic anhydride by heterogeneously catalyzed gas-phase oxidation of a hydrocarbon having at least four carbon atoms, by reacting vanadium pentoxide (I) in the presence of a primary or secondary, noncyclic or cyclic, unbranched or branched, saturated alcohol having from 3 to 6 carbon atoms (II) with a pentavalent or trivalent phosphorus compound (III) in a temperature range from 80 to 160&#xb0; C. with stirring and subsequently filtering the resultant suspension, in which (a) the way in which the phosphorus compound (III) and the vanadium pentoxide (I) are combined in the presence of the alcohol (II), (b) the action of a stirring power of from 0.01 to 0.6 W/kg suspension, and/or (c) the filtration at a temperature from 65&#xb0; C. to 160&#xb0; C. are used to set a filtration resistance &#x3b1;&#xb7;&#x3b7; of &#x3c;50&#xb7;10mPa&#xb7;s/m; a catalyst precursor obtainable from this process; a process for preparing a catalyst from the catalyst precursor; a catalyst obtainable from this process; and a process for preparing maleic anhydride over this catalyst.

Process for preparing phthalic anhydride by gas-phase oxidation of xylene, naphthalene or mixtures thereof in a shell-and-tube reactor thermostatted by means of a heat transfer medium over three or more different fixed-bed catalysts arranged in zones, wherein the process is carried out so that the maximum temperature in the second catalyst zone in the flow direction is up to 50&#xb0; C. lower than the maximum temperature in the first catalyst zone and the maximum temperature in the third zone from the gas inlet is from 30 to 100&#xb0; C. lower than that in the first catalyst zone. The process of the present invention makes it possible to prepare phthalic anhydride in high yields under industrially relevant conditions.

Preparation of phthalic anhydride

The invention relates to a novel structured catalyst bed which optionally comprises at least one part bed comprising at least one catalytically active mixture of oxides of the main group metals and transition metals and additionally comprises at least one catalytically active part bed comprising at least silver, at least one alkali metal and a porous support material and finally and necessarily at least one catalytically active part bed comprising at least one alkali metal phosphate and at least one sheet silicate.

Structured catalyst bed

Disclosed is a method for producing a catalyst containing vanadium, phosphorus, and oxygen, which is used for oxidizing the gas phase of a hydrocarbon having at least four carbon atoms to maleic anhydride. According to the inventive method, a corresponding catalyst precursor which contains vanadium, phosphorus, and oxygen and is provided with particles having an average diameter of at least 2 mm is converted into a catalytically active form by means of calcination, and a flow of the catalyst precursor is transported on a conveyor belt across at least one calcination area over a distanceat an essentially steady speed in order to be calcinated. The variation over time of the gas temperature in relation to the set point value amounts to &#x2266;5&#xb0; C. at each position in the area of the flow of the catalyst precursor, which lies within the second half/2 of the calcination area, while the local difference in the gas temperature between any positions in the area of the flow of the catalyst precursor, which is located within the second half/2 of the calcination area, amounts to &#x2266;5&#xb0; C.

Method for the production of a catalyst containing vanadium, phosphorus, and oxygen

A catalyst used in a process for preparing maleic anhydride by heterogeneously catalyzed gas-phase oxidation of a hydrocarbon having at least four carbon atoms by means of oxygen-containing gases comprises a catalytically active composition comprising vanadium, phosphorus and oxygen and has a essentially hollow cylindrical structure in which (a) the ratio of the height h to the diameter of the continuous hole d is not more than 1.5 and (b) the ratio of the geometric surface area A to the geometric volume V is at least 2 mm .

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Mannheim, Germany

Sebastian Storck