Patents by Inventor Hans-Jurgen Bister

Hans-Jurgen Bister 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).

  • Process for removing cyclic acetals from wastewater streams
    Patent number: 6623649
    Abstract: A process is provided which makes it possible to separate off cyclic acetals from wastewater streams to a substantial extent, by passing the wastewater stream over a heterogeneous acid catalyst.
    Type: Grant
    Filed: June 5, 2001
    Date of Patent: September 23, 2003
    Assignee: BP Koln GmbH
    Inventors: Hans-Jurgen Bister, Alexander Gammersbach, Axel Gohrt, Joachim Grub, Stefanie Konig
  • Process for removing cyclic acetals from wastewater streams
    Publication number: 20020040877
    Abstract: A process is provided which makes it possible to separate off cyclic acetals from wastewater streams to a substantial extent, by passing the wastewater stream over a heterogeneous acid catalyst.
    Type: Application
    Filed: June 5, 2001
    Publication date: April 11, 2002
    Inventors: Hans-Jurgen Bister, Alexander Gammersbach, Axel Gohrt, Joachim Grub, Stefanie Konig
  • Catalyst agent for etherifying, hydrogenating and isomerizing crude . C.sub4 -C.sub.8 - hydrocarbon mixtures having sulfur content
    Patent number: 6074982
    Abstract: A catalytic agent for etherifying, hydrogenating and isomerizing crude C.sub.4 -C.sub.8 -- hydrocarbon mixtures having a sulfur content, comprising a macroporous or gel cation exchanger having SO.sub.3 H groups and being charged with a mixture of a metal selected from the group consisting of Pd, Ru, Rh and Pt with a metal selected from the group consisting of Fe, Co, Ni, Cu, Ag and W.
    Type: Grant
    Filed: October 20, 1997
    Date of Patent: June 13, 2000
    Assignees: Bayer Aktiengesellschaft, EC Erdolchemie GmbH
    Inventors: Hans-Jurgen Bister, Arnd Stuwe, Herbert Tschorn, Rudolf Wagner, Werner Struver
  • Process for oligomerizing I-butene comprising hydroisomerizing portion of condensate and recycling the hydroisomerate to fractionation
    Patent number: 5789643
    Abstract: The i-butene present in a C.sub.4 raffinate I is subjected in a first step to a first hydroisomerization. The hydroisomerization product is subjected to fractional distillation, with essentially 2-butene and n-butane being obtained as bottom product and i-butene and i-butane being obtained as overhead product. The overhead product is condensed and the condensate is divided into two parts. One part is subjected to a second hydroisomerization and the second hydroisomerate is recycled to the upper third of the fractionation column. The other part of the condensed overhead product is fed to the oligomerization. The condensed overhead-product of the fractionation column is divided in such a manner that, based on 1 part by volume of condensate conducted to the oligomerization, 1-5 parts by volume are fed to the second hydroisomerization.
    Type: Grant
    Filed: October 30, 1997
    Date of Patent: August 4, 1998
    Assignee: EC Erdolchemie GmbH
    Inventors: Jens Herwig, Hans-Jurgen Bister, Arnd Stuwe