Patents by Inventor Hans-Juergen LANG

Hans-Juergen LANG 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 preparing an aqueous acrylamide solution having a low acrylic acid concentration
    Patent number: 10227621
    Abstract: The present invention relates to methods for preparing an aqueous acrylamide solution having a low acrylic acid concentration. In addition, the present invention relates to methods for reducing the acrylic acid concentration of an aqueous acrylamide solution. The methods involve a bioconversion of acrylonitrile to acrylamide in the presence of a biocatalyst, wherein during the bioconversion the content of acrylonitrile is maintained at 0.3 w/w % or more referred to the total weight of the composition in the reactor. Also provided is an aqueous acrylamide solution which is obtained by the methods of the present invention. Furthermore, the present invention is related to an acrylamide homopolymer or copolymer obtained by polymerizing the acrylamide of the aqueous solution.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: March 12, 2019
    Assignee: BASF SE
    Inventors: Michael Guenter Braun, Juergen Daeuwel, Hans-Juergen Lang, Peter Oedman, Kai-Uwe Baldenius, Matthias Kleiner, Michael Kiefer, Stephan Freyer, Michael Budde
  • METHOD FOR PREPARING AN AQUEOUS ACRYLAMIDE SOLUTION HAVING A LOW ACRYLIC ACID CONCENTRATION
    Publication number: 20170283840
    Abstract: The present invention relates to methods for preparing an aqueous acrylamide solution having a low acrylic acid concentration. In addition, the present invention relates to methods for reducing the acrylic acid concentration of an aqueous acrylamide solution. The methods involve a bioconversion of acrylonitrile to acrylamide in the presence of a biocatalyst, wherein during the bioconversion the content of acrylonitrile is maintained at 0.3 w/w % or more referred to the total weight of the composition in the reactor. Also provided is an aqueous acrylamide solution which is obtained by the methods of the present invention. Furthermore, the present invention is related to an acrylamide homopolymer or copolymer obtained by polymerizing the acrylamide of the aqueous solution.
    Type: Application
    Filed: September 30, 2015
    Publication date: October 5, 2017
    Applicant: BASF SE
    Inventors: Michael BRAUN, Juergen DAEUWEL, Hans-Juergen LANG, Peter OEDMAN, Kai-Uwe BALDENIUS, Matthias KLEINER, Michael KIEFER, Stephan FREYER, Michael BUDDE