Patents by Inventor Andreas Tenten

Andreas Tenten has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6084126
    Abstract: A method for gas-phase oxidation of an organic compound such as acrolein is provided, which includes oxidizing the organic compound with an oxidizing agent in the presence of a catalyst, to produce a product such as acrylic acid, wherein the catalyst includes a multimetal oxide material having at least two phases and of the formula III{A}.sub.p {B}.sub.q (III),wherein ##EQU1## M.sup.1, M.sup.2, a, b, c, x, M.sup.3, d, e, y, p and q are defined in the claims,which contains the moiety {A}.sub.p in the form of three-dimensional regions A which are delimited from their local environment owing to their chemical composition differing from their local environment and are of the chemical compositionA Mo.sub.12-a-b-c V.sub.a M.sub.b.sup.1 M.sub.c.sup.2 O.sub.xand the moiety {B}.sub.q in the form of three dimensional regions B which are delimited from their local environment owing to their chemical composition differing from their local environment and are of the chemical compositionB M.sub.12.sup.3 Cu.sub.d H.sub.e O.
    Type: Grant
    Filed: June 5, 1998
    Date of Patent: July 4, 2000
    Assignee: BASF Aktiengesellshaft
    Inventors: Hartmut Hibst, Andreas Tenten, Laszlo Marosi
  • Patent number: 5910608
    Abstract: A coated catalyst which consists of a hollow cylindrical carrier and a catalytically active oxide material applied to the outer surface of the carrier, the applied catalytically active oxide material being applied in a coat thickness of from 10 to 1000 .mu.m, and having a specific catalytic surface area of from 20 to 30 m.sup.2 /g and an abrasion of <10, preferably <5, particularly preferably <0,5, % by weight in the turntable abrasion test. The catalyst is useful in the preparation of acrylic acid by the gas phase oxidation of acroleins.
    Type: Grant
    Filed: June 4, 1997
    Date of Patent: June 8, 1999
    Assignee: BASF Aktiengesellschaft
    Inventors: Andreas Tenten, Peter Weidlich, Gerd Linden
  • Patent number: 5885922
    Abstract: Multimetal oxide materials containing molybdenum, vanadium, copper and one or more of the elements tungsten, niobium, tantalum, chromium and cerium and having a multiphase structure, and their use for the preparation of acrylic acid from acrolein by gas-phase catalytic oxidation, and oxometallates of the HT Cu molybdate structure type which contain Cu, Mo and at least one of the elements W, V, Nb and Ta.
    Type: Grant
    Filed: July 24, 1996
    Date of Patent: March 23, 1999
    Assignee: BASF Aktiengesellschaft
    Inventors: Hartmut Hibst, Andreas Tenten, Laszlo Marosi
  • Patent number: 5821390
    Abstract: A gas-phase mixture of propene and oxygen is catalytically oxidized by passing a reactant gas mixture comprising propene and oxygen through a plurality of catalyst containing contact tubes in a fixed bed reactor and simultaneously passing only one heat-exchange medium at elevated temperature over the exterior surfaces of the contact tubes in a longitudinal flow pattern which is cocurrent with the direction of flow of the reactants through said tube; simultaneously superposing a transverse flow on said longitudinal flow of heat exchange medium by means of an arrangement of successive baffles along the contact tubes which leave passage cross-sections free, thereby resulting in a meandrous flow of the heat-exchange medium through the reactor and setting the flow rate of said heat-exchange medium so that its temperature between the point of entry of the medium into the reactor and its point of exit increases by 2.degree. to 10.degree. C.; and obtaining product acrolein at a selectivity .gtoreq.
    Type: Grant
    Filed: September 8, 1995
    Date of Patent: October 13, 1998
    Assignee: BASF Aktiengesellschaft
    Inventors: Wilhelm Ruppel, Ulrike Wegerle, Andreas Tenten, Ulrich Hammon
  • Patent number: 5807531
    Abstract: Multimetal oxides containing Mo, V and at least one of the elements W, Nb, Ti, Zr, Hf, Ta, Cr, Si and Ge and having a special three-dimensional atomic arrangement are used in catalysts for the catalytic gas-phase oxidation of organic compounds.
    Type: Grant
    Filed: November 5, 1996
    Date of Patent: September 15, 1998
    Assignee: BASF Aktiengesellschaft
    Inventors: Hartmut Hibst, Andreas Tenten, Laszlo Marosi
  • Patent number: 5739391
    Abstract: A process for the catalytic gas-phase oxidation of acrolein to acrylic acid in a multiple contact tube fixed-bed reactor through whose space surrounding the contact tubes only one heat-exchange medium circuit is passed, at elevated temperature on catalytically active multimetal oxides with an acrolein conversion for a single pass of .gtoreq.95 mol % and an acrylic acid formation selectivity of .gtoreq.
    Type: Grant
    Filed: September 8, 1995
    Date of Patent: April 14, 1998
    Assignee: BASF Aktiengesellschaft
    Inventors: Wilhelm Ruppel, Ulrike Wegerle, Andreas Tenten, Ulrich Hammon
  • Patent number: 5705684
    Abstract: In a process for preparing acrolein, acrylic acid or a mixture thereof from propane, propane is partially dehydrogenated to propylene in a first stage, the product gas mixture resulting therefrom is, after separating off hydrogen and water vapor, used as feed to an oxidation reactor, the propylene formed in the dehydrogenation is partially oxidized in the oxidation reactor using molecular oxygen in the presence of non-dehydrogenated propane as inert diluent gas to give acrolein, acrylic acid or a mixture thereof and the propane present in the product gas mixture of the partial oxidation is subsequently recirculated to the dehydrogenation stage A.
    Type: Grant
    Filed: March 8, 1996
    Date of Patent: January 6, 1998
    Assignee: BASF Aktiengesellschaft
    Inventors: Werner Hefner, Otto Machhammer, Hans-Peter Neumann, Andreas Tenten, Wilhelm Ruppel, Herbert Vogel
  • Patent number: 5686373
    Abstract: Polymetal oxide materials of the general formula I?A!.sub.p ?B!.sub.q (I),where ##STR1## X.sup.1 is W, Nb, Ta, Cr and/or Ce, X.sup.2 is Cu, Ni, Co, Fe, Mn and/or Zn,X.sup.3 is Sb and/or Bi,X.sup.4 is Li, Na, K, Rb, Cs and/or H,X.sup.5 is Mg, Ca, Sr and/or Ba,X.sup.6 is Si, Al, Ti and/or Zr,X.sup.7 is Mo, W, V, Nb and/or Ta,a is from 1 to 8,b is from 0.2 to 5,c is from 0 to 23,d is from 0 to 50,e is from 0 to 2,f is from 0 to 5,g is from 0 to 50,h is from 4 to 30,i is from 0 to 20,x and y are each a number which is determined by the valency and frequency of the elements other than oxygen in I and p and q are non-zero numbers whose ratio p/q is from 160:1 to 1:1,and their use as catalysts.
    Type: Grant
    Filed: February 22, 1995
    Date of Patent: November 11, 1997
    Assignee: BASF Aktiengesellschaft
    Inventors: Andreas Tenten, Friedrich-Georg Martin, Hartmut Hibst, Laszlo Marosi, Veronika Kohl
  • Patent number: 5684188
    Abstract: In a process for the continuous heterogeneously catalyzed gas-phase oxidation of propylene to acrolein, acrylic acid or a mixture thereof in an oxidation reactor whose feed gas mixture comprises, apart from propylene and molecular oxygen as oxidant, only at least one diluent gas which is essentially inert under the conditions of the heterogeneously catalyzed gas-phase oxidation and where, in continuous operation, at least a part of the essentially inert diluent gases present in the product gas mixture is separated off therefrom and is reused as a constituent of the feed gas mixture to the oxidation reactor, the essentially inert diluent gas mixture comprises more than 85% by volume of at least one saturated hydrocarbon having from 1 to 5 carbon atoms.
    Type: Grant
    Filed: March 6, 1996
    Date of Patent: November 4, 1997
    Assignee: BASF Aktiengesellschaft
    Inventors: Werner Hefner, Otto Machhammer, Hans-Peter Neumann, Andreas Tenten, Wilhelm Ruppel, Herbert Vogel
  • Patent number: 5677261
    Abstract: A catalyst which consists of a carrier and a catalytically active oxide material applied to the surface of the carrier is prepared by a process in which the carrier is first moistened with, as an adhesive liquid, an aqueous solution of an organic substance boiling at above 100.degree. C. at atmospheric pressure and a layer of active oxide material is then bonded to the surface of the moistened carrier by bringing it into contact with dry, finely divided active oxide material and the adhesive liquid is then removed from the moistened carrier coated with active oxide material.
    Type: Grant
    Filed: November 24, 1995
    Date of Patent: October 14, 1997
    Assignee: BASF Aktiengesellschaft
    Inventors: Andreas Tenten, Peter Weidlich, Gerd Linden
  • Patent number: 5637546
    Abstract: In a process for the preparation of catalytically active poly-metal oxide materials containing Mo and V, a catalyst intermediate is calcined at from 300.degree. to 450.degree. C. in a gas atmosphere which, in addition to inert gases and/or steam, consists of from 0.5 to 4% by volume of O.sub.2 and, averaged over the calcination time, from 1 to 8% by volume of NH.sub.3.
    Type: Grant
    Filed: April 19, 1996
    Date of Patent: June 10, 1997
    Assignee: BASF Aktiengesellschaft
    Inventors: Andreas Tenten, Ulrich Hammon, Peter Weidlich
  • Patent number: 5583086
    Abstract: Cesium based multimetal oxide compositions which are suitable as catalysts for the gas-phase-catalytic oxidative preparation of methacrolein from isobutene or tert-butanol or its methyl ether. The catalysts are characterized by increased selectivity for the formation of methacrolein. The catalysts have locally delimited regions of an oxide composition, preferably (Bi.sub.2 W.sub.2 O.sub.9), surrounded by the remaining constituents of the multimetal oxide.
    Type: Grant
    Filed: February 25, 1994
    Date of Patent: December 10, 1996
    Assignee: BASF Aktiengesellschaft
    Inventors: Andreas Tenten, Hans-Peter Neumann, Herbert Exner
  • Patent number: 5569636
    Abstract: Multimetal oxide compositions having a two-phase structure and comprising molybdenum, hydrogen, one or more of the elements phosphorus, arsenic, boron, germanium and silicon, and copper, and their use for the preparation of methacrylic acid by gas-phase catalytic oxidation.
    Type: Grant
    Filed: February 16, 1995
    Date of Patent: October 29, 1996
    Assignee: BASF Aktiengesellschaft
    Inventors: Friedrich-Georg Martin, Hartmut Hibst, Andreas Tenten
  • Patent number: 5521137
    Abstract: Multimetal oxide compositions having a two-phase structure and comprising molybdenum, hydrogen, one or more of the elements phosphorus, arsenic, boron, germanium and silicon, one or more of the elements niobium, tantalum and antimony and one or more of the elements copper, iron, cobalt, nickel, zinc, cadmium, manganese, magnesium, calcium, strontium and barium, and their use for the preparation of methacrylic acid by gas-phase catalytic oxidation.
    Type: Grant
    Filed: February 17, 1995
    Date of Patent: May 28, 1996
    Assignee: BASF Aktiengesellschaft
    Inventors: Friedrich-Georg Martin, Andreas Tenten
  • Patent number: 5512525
    Abstract: A process for regenerating spent multimetal oxide oxidation catalysts from the catalytic gas-phase oxidation of lower organic compounds and which, in fresh form, contain as basic constituents the elements Mo, W, V and Cu in oxidic form, by the action of oxidizing agents or means and solubilizing, aqueous ammonia to which acetic acid and/or the ammonium salt thereof has been added, with subsequent drying and calcination, comprises quantitatively determining the content of metallic constituents during the process and making this content up to the respective original value.
    Type: Grant
    Filed: February 1, 1994
    Date of Patent: April 30, 1996
    Assignee: BASF Aktiengesellschaft
    Inventors: Andreas Tenten, Ulrich Hammon, Peter Weidlich, Walter Doerflinger
  • Patent number: 5493052
    Abstract: Multimetal oxide compositions which comprise, as basic constituents, the elements Mo, V, W, Cu and Ni in oxidic form in certain molar ratios, and the preparation of these multimetal oxide compositions, and their use as catalysts for the gas-phase catalytical oxidation of acrolein to acrylic acid.
    Type: Grant
    Filed: February 24, 1995
    Date of Patent: February 20, 1996
    Assignee: BASF Aktiengesellschaft
    Inventors: Andreas Tenten, Peter Weidlich
  • Patent number: 5446004
    Abstract: Multimetal oxide compositions which comprise, as basic constituents, the elements Mo, V, W, Cu and Ni in oxidic form in certain molar ratios, and the preparation of these multimetal oxide compositions, and their use as catalysts for the gas-phase catalytical oxidation of acrolein to acrylic acid.
    Type: Grant
    Filed: January 28, 1994
    Date of Patent: August 29, 1995
    Assignee: BASF Aktiengesellschaft
    Inventors: Andreas Tenten, Peter Weidlich