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: 8153825
    Abstract: A process is described for preparing phthalic anhydride by catalytic gas phase oxidation of o-xylene, in, in a main reactor, a gaseous mixture of o-xylene and an oxygenous gas is passed through at least two reaction zones whose temperature can be controlled independently, and converted to a gaseous intermediate reaction product which comprises unconverted o-xylene, phthalic anhydride underoxidation products and phthalic anhydride, and the intermediate reaction product is introduced into a postreactor, wherein the temperature of the reaction zones in the main reactor is regulated in such a way that the concentration of unconverted o-xylene in the intermediate reaction product is at least 0.5% by weight. The process allows an increase in the overall yield of phthalic anhydride without or without significant deterioration in the product quality.
    Type: Grant
    Filed: May 18, 2007
    Date of Patent: April 10, 2012
    Assignee: BASF SE
    Inventors: Thomas Mackewitz, Frank Rosowski, Andreas Tenten
  • Patent number: 8106220
    Abstract: A process is described for preparing phthalic anhydride by catalytic gas phase oxidation of o-xylene, in which a gaseous mixture of o-xylene and an oxygenous gas is converted in a main reactor to a gaseous intermediate reaction product which comprises unconverted o-xylene, phthalic anhydride underoxidation products and phthalic anhydride, the heat of reaction which arises in the main reactor being removed at least partly by indirect cooling with a heat carrier medium, and the intermediate reaction product being introduced into a postreactor. The concentration of unconverted o-xylene in the intermediate reaction product is at least 1% by weight, and the sum of the concentrations of phthalic anhydride underoxidation products in the intermediate reaction product is at least 0.5% by weight. The process allows an increase in the overall yield of phthalic anhydride without or without significant deterioration in the product quality.
    Type: Grant
    Filed: May 18, 2007
    Date of Patent: January 31, 2012
    Assignee: BASF SE
    Inventors: Thomas Mackewitz, Frank Rosowski, Andreas Tenten
  • Publication number: 20110028740
    Abstract: What is described is a method for starting a gas phase oxidation reactor that contains a bed of a first catalyst whose active material comprises a catalytically active silver-vanadium oxide bronze, and at least one bed of a second catalyst whose catalytically active material comprises vanadium pentoxide and titanium dioxide, and whose temperature is controllable by means of a heat transfer medium. In the operating state, a gas stream which comprises a loading cop of a hydrocarbon and molecular oxygen is passed through the reactor over the bed of the first and second catalyst at a temperature Top of the heat transfer medium. For the startup, a) a gas stream is passed through the reactor with a starting loading c0 which is less than cop, and at a starting temperature T0 of the heat transfer medium which is less than Top, and b) the temperature of the heat transfer medium is brought to Top and the loading of the gas stream to cop.
    Type: Application
    Filed: April 7, 2009
    Publication date: February 3, 2011
    Applicant: BASF SE
    Inventors: Cornelia Dobner, Ulf Dietrich, Thomas Mackewitz, Sebastian Storck, Hagen Wilmer, Frank Rosowski, Andreas Tenten
  • Publication number: 20090198073
    Abstract: A process is described for preparing phthalic anhydride by catalytic gas phase oxidation of o-xylene. In, in a main reactor, a gaseous mixture of o-xylene and an oxygenous gas is passed through at least two reaction zones whose temperature can be controlled independently, and converted to a gaseous intermediate reaction product which comprises unconverted o-xylene, phthalic anhydride underoxidation products and phthalic anhydride, and the intermediate reaction product is introduced into a postreactor, wherein the temperature of the reaction zones in the main reactor is regulated in such a way that the concentration of unconverted o-xylene in the intermediate reaction product is at least 0.5% by weight. The process allows an increase in the overall yield of phthalic anhydride without or without significant deterioration in the product quality.
    Type: Application
    Filed: May 18, 2007
    Publication date: August 6, 2009
    Applicant: BASF SE
    Inventors: Thomas Mackewitz, Frank Rosowski, Andreas Tenten
  • Publication number: 20090156835
    Abstract: A process is described for preparing phthalic anhydride by catalytic gas phase oxidation of o-xylene, in which a gaseous mixture of o-xylene and an oxygenous gas is converted in a main reactor to a gaseous intermediate reaction product which comprises unconverted o-xylene, phthalic anhydride underoxidation products and phthalic anhydride, the heat of reaction which arises in the main reactor being removed at least partly by indirect cooling with a heat carrier medium, and the intermediate reaction product being introduced into a postreactor. The concentration of unconverted o-xylene in the intermediate reaction product is at least 1% by weight, and the sum of the concentrations of phthalic anhydride underoxidation products in the intermediate reaction product is at least 0.5% by weight. The process allows an increase in the overall yield of phthalic anhydride without or without significant deterioration in the product quality.
    Type: Application
    Filed: May 18, 2007
    Publication date: June 18, 2009
    Inventors: Thomas Mackewitz, Frank Rosowski, Andreas Tenten
  • Patent number: 7214822
    Abstract: A coated catalyst whose coating of active composition is a multimetal oxide comprising the elements Mo, V and Te and/or Sb can be used for the gas-phase catalytic oxidation of propane to acrylic acid.
    Type: Grant
    Filed: September 19, 2005
    Date of Patent: May 8, 2007
    Assignee: BASF Aktiengesellschaft
    Inventors: Frieder Borgmeier, Andreas Tenten, Hartmut Hibst
  • Patent number: 7151184
    Abstract: 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° 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° 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.
    Type: Grant
    Filed: February 4, 2003
    Date of Patent: December 19, 2006
    Assignee: BASF Aktiengesellschaft
    Inventors: Sebastian Storck, Frank Rosowski, Michael Baier, Andreas Tenten, Hans-Josef Wolf
  • Publication number: 20060127287
    Abstract: The array of heterogeneous catalysts and/or their precursors, is made up of a body which has, preferably parallel, through-channels and in which at least n channels comprise n different heterogeneous catalysts and/or their precursors, where n is 2, preferably 10, particularly preferably 100, in particular 1000, especially 10,000.
    Type: Application
    Filed: January 23, 2006
    Publication date: June 15, 2006
    Inventors: Hartmut Hibst, Andreas Tenten, Dirk Demuth, Ferdi Schueth, Stephan Schunk
  • Patent number: 7026506
    Abstract: In a process for the preparation of acrylic acid by heterogeneously catalyzed gas-phase oxidation of propene with molecular oxygen in a reaction zone, the catalytically active material is a multimetal oxide which contains the elements Mo, V, Te and/or Sb and has a specific structure.
    Type: Grant
    Filed: April 12, 2002
    Date of Patent: April 11, 2006
    Assignee: BASF Aktiengesellschaft
    Inventors: Frieder Borgmeier, Jochen Petzoldt, Hartmut Hibst, Andreas Tenten
  • Publication number: 20060074258
    Abstract: A coated catalyst whose coating of active composition is a multimetal oxide comprising the elements Mo, V and Te and/or Sb can be used for the gas-phase catalytic oxidation of propane to acrylic acid.
    Type: Application
    Filed: September 19, 2005
    Publication date: April 6, 2006
    Applicant: BASF Aktiengesellschaft
    Inventors: Frieder Borgmeier, Andreas Tenten, Hartmut Hibst
  • Patent number: 7005403
    Abstract: A coated catalyst whose coating of active composition is a multimetal oxide comprising the elements Mo, V and Te and/or Sb can be used for the gas-phase catalytic oxidation of propane to acrylic acid.
    Type: Grant
    Filed: October 16, 2001
    Date of Patent: February 28, 2006
    Assignee: BASF Aktiengesellschaft
    Inventors: Frieder Borgmeier, Andreas Tenten, Hartmut Hibst
  • Patent number: 6998504
    Abstract: A process for the catalytic gas-phase oxidation of propene to acrylic acid, in which the reaction gas starting mixture is oxidized, with a high propene loading, in a first reaction stage, over a first fixed-bed catalyst which is housed in two successive reaction zones A, B, the reaction zone B being kept at a higher temperature than the reaction zone A, and the acrolein-containing product gas mixture of the first reaction stage is then oxidized in a second reaction stage, with a high acrolein loading, over a second fixed-bed catalyst which is housed in two successive reaction zones C, D, the reaction zone D being kept at a higher temperature than the reaction zone C.
    Type: Grant
    Filed: February 28, 2000
    Date of Patent: February 14, 2006
    Assignee: BASF Aktiengesellschaft
    Inventors: Signe Unverricht, Heiko Arnold, Andreas Tenten, Ulrich Hammon, Hans-Peter Neumann, Klaus Harth
  • Publication number: 20050148782
    Abstract: 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° 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° 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.
    Type: Application
    Filed: February 4, 2003
    Publication date: July 7, 2005
    Inventors: Sebastian Storck, Frank Rosowski, Michael Baier, Andreas Tenten, hans-Josef Wolf
  • Patent number: 6870014
    Abstract: The invention relates to a catalyst which contains a catalytically active quantity of at least one oxygen-containing molybdenum and/or wolfram compound on an oxidic support material and which has been calcinated at temperatures of 400 to 900° C. after the precursor compound of the catalytically active compounds have been applied to the support material or to a support material precursor. The transport pores for this catalyst each have a diameter of >25 nm and a volume of at least 50 mm3/g. The catalyst contains x ?mol (wolfram and/or molybdenum)/m2 molybdenum and/or wolfram, with 10.1<x<20.9 in relation to the finished catalyst, with the oxidic support material having a BET surface area of 135 to 220 m2/g. Catalysts of this type are characterized by an acidity of at least 70 ?mol/g at pKs<?3 in the dry state and are therfore very active. The invention also relates to a method for producing a catalyst of this type and to the preferred use thereof.
    Type: Grant
    Filed: July 2, 2001
    Date of Patent: March 22, 2005
    Assignee: BASF Aktiengesellschaft
    Inventors: Ulrich Steinbrenner, Thomas Narbeshuber, Martin Haubner, Christoph Sigwart, Gerd Linden, Gerhard Cox, Rolf-Hartmuth Fischer, Michael Hesse, Gerd Bohner, Hartmut Hibst, Ekkehard Schwab, Andreas Tenten
  • Patent number: 6867328
    Abstract: The invention relates to a method for producing acrylic acid by the heterogeneously catalysed gas-phase oxidation of propane on a multi-metal oxide mass, said mass containing the elements Mo, V, Te and/or Sb and having a specific X-ray diffractogram.
    Type: Grant
    Filed: July 16, 2001
    Date of Patent: March 15, 2005
    Assignee: BASF Aktiengesellschaft
    Inventors: Frieder Borgmeier, Andreas Tenten, Hartmut Hibst, Klaus Joachim Müller-Engel, Signe Unverricht, Gerhard Cox
  • Patent number: 6812351
    Abstract: 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 d2 is not more than 1.5 and (b) the ratio of the geometric surface area Ageo to the geometric volume Vgeo is at least 2 mm−1.
    Type: Grant
    Filed: September 5, 2002
    Date of Patent: November 2, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Jens Weiguny, Sebastian Storck, Andreas Tenten
  • Patent number: 6803473
    Abstract: In a process for preparing maleic anhydride by heterogeneously catalyzed gas-phase oxidation of hydrocarbons having at least four carbon atoms using oxygen-containing gases in the presence of a volatile phosphorus compound over a catalyst comprising vanadium, phosphorus and oxygen in a shell-and-tube reactor unit having at least two successive cooled reaction zones, the temperature of the first reaction zone is from 350 to 450° C. and the temperature of the second and further reaction zones is from 350 to 480° C. and the temperature difference between the hottest reaction zone and the coolest reaction zone is at least 2° C.
    Type: Grant
    Filed: September 5, 2002
    Date of Patent: October 12, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Jens Weiguny, Sebastian Storck, Andreas Tenten, Wilhelm Ruppel
  • Patent number: 6781017
    Abstract: In a process for the preparation of acrolein or acrylic acid or a mixture thereof from propane, the propane is subjected, in a first reaction stage, to a partial dehydrogenation under heterogeneous catalysis to give propene, of the components contained in the product gas mixture formed in the first reaction stage other than propene and propane at least a portion of the molecular hydrogen present is then separated off from said mixture and the product gas mixture is then used for the preparation of acrolein and/or acrylic acid by gas-phase catalytic propylene oxidation, molecular nitrogen being present for diluting the reaction gas mixture during the propylene oxidation.
    Type: Grant
    Filed: December 13, 2002
    Date of Patent: August 24, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Otto Machhammer, Goetz-Peter Schindler, Andreas Tenten, Klaus Harth, Peter Zehner, Klaus Joachim Müller-Engel, Frank Rosowski, Frieder Borgmeier
  • Publication number: 20040102648
    Abstract: The invention relates to a shell catalyst whose active material shell is a multimetal oxide that contains the elements Mo, V and Te and/or Sb. The invention further relates to the use of said shell catalyst for gas-phase catalytic oxidation of propane to acrylic acid.
    Type: Application
    Filed: April 17, 2003
    Publication date: May 27, 2004
    Inventors: Frieder Borgmeier, Andreas Tenten, Hartmut Hibst
  • Patent number: 6740779
    Abstract: In a process for the two-stage catalytic gas-phase oxidation of propene to acrylic acid, the reaction gas starting mixture is passed, in a tube-bundle reactor, with a propene loading of ≧160 l (S.T.P.) of propene/l·h, first over a fixed catalyst bed 1 present in two successive temperature zones A, B and then over a fixed catalyst bed 2 which is housed either in one further temperature zone C or in two further temperature zones D, E, the temperature of the zone A being kept at a lower temperature than the zone B and the temperature of the zone D at a lower temperature than the zone E.
    Type: Grant
    Filed: April 22, 2002
    Date of Patent: May 25, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Andreas Tenten, Hartmut Hibst, Otto Machhammer, Claus Hechler, Klaus Joachim Müller-Engel, Signe Unverricht