Patents by Inventor Andreas DOERFLEIN

Andreas DOERFLEIN 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).

  • Method for determining dimethyl disulphide
    Patent number: 10422778
    Abstract: A method for determining dimethyl disulphide proceeds by carrying out a chromatographic separation of an analyte containing at least dimethyl disulphide and methanesulphonic acid, and determining the dimethyl disulphide by pulsed amperometric detection.
    Type: Grant
    Filed: December 17, 2015
    Date of Patent: September 24, 2019
    Assignee: Evonik Degussa GmbH
    Inventors: Harald Jakob, Benjamin Fonfe, Sebastian Fuss, Andreas Doerflein, Markus Held, Nadine Duerr
  • Process for preparing an alkanesulphonic acid
    Patent number: 10399934
    Abstract: The present invention relates to a process for preparing alkanesulphonic acid by oxidizing an alkyl mercaptan, a dialkyl disulphide and/or a dialkyl polysulphide having three to nine sulphur atoms with an oxidizing agent, wherein additional oxidizing agent is fed into the oxidation if as yet unoxidized alkyl mercaptan and/or unoxidized dialkyl disulphide and/or at least one intermediate from the oxidation of the dialkyl disulphide and/or of the dialkyl polysulphide is present in the reaction output, and a corresponding apparatus for performance of oxidation reactions.
    Type: Grant
    Filed: November 30, 2016
    Date of Patent: September 3, 2019
    Assignee: Evonik Degussa GmbH
    Inventors: Benjamin Fonfe, Nadine Duerr, Harald Jakob, Chiu Kee Cheung, Andreas Doerflein, Sebastian Fuss
  • PROCESS FOR PREPARING AN ALKANESULPHONIC ACID
    Publication number: 20180354897
    Abstract: The present invention relates to a process for preparing alkanesulphonic acid by oxidizing an alkyl mercaptan, a dialkyl disulphide and/or a dialkyl polysulphide having three to nine sulphur atoms with an oxidizing agent, wherein additional oxidizing agentis fed into the oxidation if as yet unoxidized alkyl mercaptan and/or unoxidized dialkyl disulphide and/or at least one intermediate from the oxidation of the dialkyl disulphide and/or of the dialkyl polysulphide is present in the reaction output, and a corresponding apparatus for performance of oxidation reactions.
    Type: Application
    Filed: November 30, 2016
    Publication date: December 13, 2018
    Applicant: Evonik Degussa GmbH
    Inventors: Benjamin FONFE, Nadine DUERR, Harald JAKOB, Chiu Kee CHEUNG, Andreas DOERFLEIN, Sebastian FUSS
  • METHOD FOR DETERMINING DIMETHYL DISULPHIDE
    Publication number: 20180267002
    Abstract: A method for determining dimethyl disulphide proceeds by carrying out a chromatographic separation of an analyte containing at least dimethyl disulphide and methanesulphonic acid, and determining the dimethyl disulphide by pulsed amperometric detection.
    Type: Application
    Filed: December 17, 2015
    Publication date: September 20, 2018
    Applicant: Evonik Degussa GmbH
    Inventors: Harald JAKOB, Benjamin Fonfe, Sebastian Fuss, Andreas Doerflein, Markus Held, Nadine Duerr
  • Process for preparing alkanesulfonic acids
    Patent number: 10023531
    Abstract: The present invention relates to a process for preparing alkanesulfonic acids from dialkyl disulfides with nitric acid and oxygen.
    Type: Grant
    Filed: December 10, 2014
    Date of Patent: July 17, 2018
    Assignee: EVONIK DEGUSSA GmbH
    Inventors: Benjamin Fonfe, Harald Jakob, Chuanhua He, Andreas Doerflein, Sebastian Fuss
  • PROCESS FOR PREPARING ALKANESULFONIC ACIDS
    Publication number: 20160304446
    Abstract: The present invention relates to a process for preparing alkanesulfonic acids from dialkyl disulfides with nitric acid and oxygen.
    Type: Application
    Filed: December 10, 2014
    Publication date: October 20, 2016
    Applicant: EVONIK DEGUSSA GMBH
    Inventors: Benjamin FONFE, Harald JAKOB, Chuanhua HE, Andreas DOERFLEIN, Sebastian FUSS