Patents by Inventor Arnd Stüwe

Arnd Stüwe 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 isolating cyclopentane and/or cyclopentene
    Patent number: 6468399
    Abstract: Cyclopentane and/or cyclopentene and, if desired, isopentane can be obtained by distillative separation from a pre-benzene fraction or a C5 fraction which has in each case being partially hydrogenated to remove acetylene compounds and diolefins, wherein a) in a first fractional distillation, low boilers are removed as first top product and, either b1) the first bottom product is fed to a second fractional distillation and there cyclopentene is taken off as second top product and cyclopentane and higher-boiling hydrocarbons are taken off as second bottom product and this second bottom product is separated into cyclopentene and higher boilers in a third fractional distillation, or b2) the first bottom product is subjected to a catalytic hydrogenation and subsequently, in a fractional distillation, separated into cyclopentane as top product and higher boilers as bottom product, or b3) the first bottom product is subjected to a fractional distillation to separate off the relatively high boilers as bottom prod
    Type: Grant
    Filed: February 16, 2001
    Date of Patent: October 22, 2002
    Assignee: BP Koln GmbH
    Inventors: Arnd Stüwe, Rolf Dieter Wurtz, Michael Müller, Jens Herwig, Christian Gabel, Joachim Grub
  • Process for isolating cyclopentane and/or cyclopentene
    Patent number: 6264799
    Abstract: Cyclopentane and/or cyclopentene and, if desired, isopentane can be obtained by distillative separation from a pre-benzene fraction or a C5 fraction which has in each case being partially hydrogenated to remove acetylene compounds and diolefins, wherein a) in a first fractional distillation, low boilers are removed as first top product and, either b1) the first bottom product is fed to a second fractional distillation and there cyclopentene is taken off as second top product and cyclopentane and higher-boiling hydrocarbons are taken off as second bottom product and this second bottom product is separated into cyclopentene and higher boilers in a third fractional distillation, or b2) the first bottom product is subjected to a catalytic hydrogenation and subsequently, in a fractional distillation, separated into cyclopentane as top product and higher boilers as bottom product, or b3) the first bottom product is subjected to a fractional distillation to separate off the relatively high boilers as bottom prod
    Type: Grant
    Filed: March 5, 1999
    Date of Patent: July 24, 2001
    Assignee: EC Erdolchemie GmbH
    Inventors: Arnd Stüwe, Rolf Dieter Wurtz, Michael Müller, Jens Herwig, Christian Gabel, Joachim Grub