Patents by Inventor Ralf Maassen

Ralf Maassen 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).

  • Reactor and process for preparing hydrogen sulphide
    Patent number: 9649615
    Abstract: The present invention relates to a reactor and to a process for synthesis of hydrogen sulphide from elemental sulphur and hydrogen at elevated pressure and elevated temperature. The invention further relates to the use of the reactor for preparation of hydrogen sulphide in high yield and with a low H2Sx content.
    Type: Grant
    Filed: May 31, 2013
    Date of Patent: May 16, 2017
    Assignee: EVONIK DEGUSSA GmbH
    Inventors: Caspar-Heinrich Finkeldei, Chiu Kee Cheung, Ralf Maassen, Stefan Wenner, Martin Koerfer
  • Reactor and process for preparing hydrogen sulphide
    Patent number: 9630843
    Abstract: The present invention relates to a reactor and to a process for synthesis of hydrogen sulphide from elemental sulphur and hydrogen at elevated pressure and elevated temperature. The invention further relates to the use of the reactor for preparation of hydrogen sulphide in high yield and with a low H2Sx content.
    Type: Grant
    Filed: May 31, 2013
    Date of Patent: April 25, 2017
    Assignee: EVONIK DEGUSSA GmbH
    Inventors: Caspar-Heinrich Finkeldei, Chiu Kee Cheung, Ralf Maassen, Geert Van Eester, Stefan Wenner, Martin Koerfer
  • Reactor and process for preparing hydrogen sulphide
    Patent number: 9440208
    Abstract: The present invention relates to a reactor and to a process for synthesis of hydrogen sulphide from elemental sulphur and hydrogen at elevated pressure and elevated temperature. The invention further relates to the use of the reactor for preparation of hydrogen sulphide in high yield and with a low H2SX content.
    Type: Grant
    Filed: May 31, 2013
    Date of Patent: September 13, 2016
    Assignee: EVONIK DEGUSSA GmbH
    Inventors: Caspar-Heinrich Finkeldei, Chiu Kee Cheung, Ralf Maassen, Stefan Wenner, Martin Koerfer
  • Reactor and process for preparing hydrogen sulphide
    Patent number: 9421511
    Abstract: The present invention relates to a reactor and to a process for synthesis of hydrogen sulphide from elemental sulphur and hydrogen at elevated pressure and elevated temperature. The invention further relates to the use of the reactor for preparation of hydrogen sulphide in high yield and with a low H2Sx content.
    Type: Grant
    Filed: May 31, 2013
    Date of Patent: August 23, 2016
    Assignee: Evonik Degussa GmbH
    Inventors: Caspar-Heinrich Finkeldei, Chiu Kee Cheung, Ralf Maassen, Stefan Wenner, Martin Koerfer
  • REACTOR AND PROCESS FOR PREPARING HYDROGEN SULPHIDE
    Publication number: 20150209747
    Abstract: The present invention relates to a reactor and to a process for synthesis of hydrogen sulphide from elemental sulphur and hydrogen at elevated pressure and elevated temperature. The invention further relates to the use of the reactor for preparation of hydrogen sulphide in high yield and with a low H2Sx content.
    Type: Application
    Filed: May 31, 2013
    Publication date: July 30, 2015
    Applicant: EVONIK INDUSTRIES AG
    Inventors: Caspar-Heinrich Finkeldei, Chiu Kee Cheung, Ralf Maassen, Stefan Wenner, Martin Körfer
  • REACTOR AND PROCESS FOR PREPARING HYDROGEN SULPHIDE
    Publication number: 20150190775
    Abstract: The present invention relates to a reactor and to a process for synthesis of hydrogen sulphide from elemental sulphur and hydrogen at elevated pressure and elevated temperature. The invention further relates to the use of the reactor for preparation of hydrogen sulphide in high yield and with a low H2Sx content.
    Type: Application
    Filed: May 31, 2013
    Publication date: July 9, 2015
    Applicant: Evonik Industries AG
    Inventors: Caspar-Heinrich Finkeldei, Chiu Kee Cheung, Ralf Maassen, Stefan Wenner, Martin Körfer
  • REACTOR AND PROCESS FOR PREPARING HYDROGEN SULPHIDE
    Publication number: 20150175419
    Abstract: The present invention relates to a reactor and to a process for synthesis of hydrogen sulphide from elemental sulphur and hydrogen at elevated pressure and elevated temperature. The invention further relates to the use of the reactor for preparation of hydrogen sulphide in high yield and with a low H2Sx content.
    Type: Application
    Filed: May 31, 2013
    Publication date: June 25, 2015
    Applicant: EVONIK INDUSTRIES AG
    Inventors: Caspar-Heinrich Finkeldei, Chiu Kee Cheung, Ralf Maassen, Geert Van Eester, Stefan Wenner, Martin Koerfer
  • REACTOR AND PROCESS FOR PREPARING HYDROGEN SULPHIDE
    Publication number: 20150151271
    Abstract: The present invention relates to a reactor and to a process for synthesis of hydrogen sulphide from elemental sulphur and hydrogen at elevated pressure and elevated temperature. The invention further relates to the use of the reactor for preparation of hydrogen sulphide in high yield and with a low H2Sx content.
    Type: Application
    Filed: May 31, 2013
    Publication date: June 4, 2015
    Applicant: Evonik Industries AG
    Inventors: Caspar-Heinrich Finkeldei, Chiu Kee Cheung, Ralf Maassen, Stefan Wenner, Martin Koerfer
  • Process for the preparation of 2,3,5-trimethy1-p-Benzoquinone
    Patent number: 6410798
    Abstract: A process for the preparation of 2,3,5-trimethyl-p-benzoquinone by oxidation of 2,3,5- or 2,3,6-trimethylphenol using oxygen or a gas mixture containing oxygen in the presence of a two-phase liquid reaction medium composed of water and a neocarboxylic acid having to 11 carbon atoms with a copper (II) halide-containing catalyst system at elevated temperature.
    Type: Grant
    Filed: March 8, 2001
    Date of Patent: June 25, 2002
    Assignee: Degussa-Huls Aktiengesellschaft
    Inventors: Ralf Maassen, Steffen Krill, Klaus Huthmacher
  • Process for the preparation of 2,3,5-trimethy1-p- benzoquinone
    Publication number: 20010041804
    Abstract: A process for the preparation of 2,3,5-trimethyl-p-benzoquinone by oxidation of 2,3,5- or 2,3,6-trimethylphenol using oxygen or a gas mixture containing oxygen in the presence of a two-phase liquid reaction medium composed of water and a neocarboxylic acid having to 11 carbon atoms with a copper (II) halide-containing catalyst system at elevated temperature.
    Type: Application
    Filed: March 8, 2001
    Publication date: November 15, 2001
    Inventors: Ralf Maassen, Steffen Krill
  • Process for the preparation of 2,3,5-trimethyl-p-benzoquinone
    Patent number: 6262311
    Abstract: Process for the preparation of 2,3,5-trimethyl-p-benzoquinone by oxidizing 2,3,5-trimethylphenol or 2,3,6-trimethylphenol with oxygen or an oxygen-containing gas mixture in the presence of a catalyst system which can be a copper halide and a transition metal halide; for example iron, chromium, manganese, cobalt, nickel, zinc or a rare earth halide, in a two-phase reaction medium, at elevated temperature.
    Type: Grant
    Filed: October 16, 2000
    Date of Patent: July 17, 2001
    Assignee: Degussa AG
    Inventors: Ralf Maassen, Steffen Krill, Barbara Jäger, Klaus Huthmacher