Patents by Inventor Jochen Praefke

Jochen Praefke 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 preparing ethyl tert-butyl ether from technical mixtures of C4 hydrocarbons
    Patent number: 8269050
    Abstract: The invention relates to a process for preparing ETBE from technical mixtures which comprise at least 1-butene, isobutene, n-butane and 2-butenes, by reacting the isobutene present, distillatively removing a fraction comprising 1-butene and isobutene and again reacting the isobutene present therein to give ETBE.
    Type: Grant
    Filed: December 21, 2006
    Date of Patent: September 18, 2012
    Assignee: Evonik Oxeno GmbH
    Inventors: Jochen Praefke, Armin Rix, Silvia Santiago Fernandez, Matthias Groemping, Frank Hoeper, Udo Peters, Joerg Leistner, Franz Nierlich, Dirk Roettger
  • Process for preparing 1-butene from technical mixtures of C4 hydrocarbons
    Patent number: 7932428
    Abstract: The invention relates to a process for preparing 1-butene from technical mixtures which comprise at least 1-butene, isobutene, n-butane and 2-butenes by partial conversion of the isobutene present, distillative removal of a fraction comprising 1-butene and isobutene, and conversion of the isobutene present therein to tert-butyl ethers.
    Type: Grant
    Filed: September 15, 2006
    Date of Patent: April 26, 2011
    Assignee: Evonik Oxeno GmbH
    Inventors: Armin Rix, Udo Peters, Jochen Praefke, Dirk Röttger, Franz Nierlich
  • Process for fine purification of 1-butenic streams
    Patent number: 7737318
    Abstract: The invention relates to a process for preparing 1-butenic fractions having less than 2000 ppm of isobutene in relation to 1-butene from technical mixtures of C4 hydrocarbons I which contain at least 1-butene and 2000 ppmw to 8% by mass of isobutene based on the 1-butene, with or without n-butane, isobutane and/or 2-butenes.
    Type: Grant
    Filed: December 14, 2006
    Date of Patent: June 15, 2010
    Assignee: Evonik Oxeno GmbH
    Inventors: Silvia Santiago-Fernandez, Armin Rix, Jochen Praefke, Dirk Roettger, Markus Winterberg, Wilfried Bueschken
  • PROCESS FOR FINE PURIFICATION OF 1-BUTENIC STREAMS
    Publication number: 20100144998
    Abstract: The invention relates to a process for preparing 1-butenic fractions having less than 2000 ppm of isobutene in relation to 1-butene from technical mixtures of C4 hydrocarbons I which contain at least 1-butene and 2000 ppmw to 8% by mass of isobutene based on the 1-butene, with or without n-butane, isobutane and/or 2-butenes.
    Type: Application
    Filed: February 12, 2010
    Publication date: June 10, 2010
    Applicant: OXENO OLEFINCHEMIE GMBH
    Inventors: Silvia SANTIAGO-FERNANDEZ, Armin RIX, Jochen PRAEFKE, Dirk ROETTGER, Markus WINTERBERG, Wilfried BUESCHKEN
  • Process for preparing ethyl tert-butyl ether using ethanol dewatered by a membrane process
    Patent number: 7473808
    Abstract: A process for preparing ethyl tert-butyl ether (ETBE) using low-water ethanol obtained by membrane dewatering at least two streams of relatively water-rich ethanol that have a different water content. by dewatering at membranes.
    Type: Grant
    Filed: April 7, 2008
    Date of Patent: January 6, 2009
    Assignee: OXENO Olefinchemie GmbH
    Inventors: Armin Rix, Frank Hoeper, Jochen Praefke, Wilfried Bueschken
  • Method for producing butene oligomers and tert-butyl ethers from Cflows containing isobutene
    Patent number: 7473812
    Abstract: The invention relates to a process for preparing butene oligomers and tert-butyl ethers from C4 hydrocarbon streams, by converting the isobutene to butene oligomers and tert-butyl ethers and removing them from the C4 streams.
    Type: Grant
    Filed: December 3, 2003
    Date of Patent: January 6, 2009
    Assignee: OXENO Olefinchemie GmbH
    Inventors: Udo Peters, Dieter Reusch, Andreas Beckmann, Dirk Roettger, Jochen Praefke
  • Process for dewatering ethanol
    Patent number: 7399892
    Abstract: A process for preparing low-water ethanol from at least two streams of relatively water-rich ethanol that have a different water content by dewatering at membranes. The low-water ethanol can be used to prepare ethyl tert-butyl ether (ETBE).
    Type: Grant
    Filed: January 19, 2007
    Date of Patent: July 15, 2008
    Assignee: OXENO Olefinchemie GmbH
    Inventors: Armin Rix, Frank Höper, Jochen Praefke, Wilfried Büschken
  • PROCESS FOR FINE PURIFICATION OF 1-BUTENIC STREAMS
    Publication number: 20080021255
    Abstract: The invention relates to a process for preparing 1-butenic fractions having less than 2000 ppm of isobutene in relation to 1-butene from technical mixtures of C4 hydrocarbons I which contain at least 1-butene and 2000 ppmw to 8% by mass of isobutene based on the 1-butene, with or without n-butane, isobutane and/or 2-butenes.
    Type: Application
    Filed: December 14, 2006
    Publication date: January 24, 2008
    Applicant: OXENO OLEFINCHEMIE GMBH
    Inventors: Silvia Santiago-Fernandez, Armin Rix, Jochen Praefke, Dirk Roettger, Markus Winterberg, Wilfried Bueschken
  • Preparation of highly pure methyl tert-butyl ether
    Patent number: 7304188
    Abstract: The invention relates to a process for preparing methyl tert-butyl ether (MTBE) in qualities which are suitable for organic syntheses and for use as a specialty solvent from MTBE in fuel quality.
    Type: Grant
    Filed: June 14, 2003
    Date of Patent: December 4, 2007
    Assignee: OXENO Olefinchemie GmbH
    Inventors: Fritz Obenaus, Wilhelm Droste, Bernhard Scholz, Franz Nierlich, Rainer Malzkorn, Udo Peters, Jochen Praefke, Richard Filipiak, Joachim Neumeister
  • PROCESS FOR PREPARING ETHYL TERT-BUTYL ETHER FROM TECHNICAL MIXTURES OF C4 HYDROCARBONS
    Publication number: 20070203369
    Abstract: The invention relates to a process for preparing ETBE from technical mixtures which comprise at least 1-butene, isobutene, n-butane and 2-butenes, by reacting the isobutene present, distillatively removing a fraction comprising 1-butene and isobutene and again reacting the isobutene present therein to give ETBE.
    Type: Application
    Filed: December 21, 2006
    Publication date: August 30, 2007
    Applicant: OXENO OLEFINCHEMIE GMBH
    Inventors: Jochen Praefke, Armin Rix, Silvia Fernandez, Matthias Gromping, Frank Hoper, Udo Peters, Jorg Leistner, Franz Nierlich, Dirk Rottger
  • PROCESS FOR DEWATERING ETHANOL
    Publication number: 20070173670
    Abstract: A process for preparing low-water ethanol from at least two streams of relatively water-rich ethanol that have a different water content by dewatering at membranes. The low-water ethanol can be used to prepare ethyl tert-butyl ether (ETBE).
    Type: Application
    Filed: January 19, 2007
    Publication date: July 26, 2007
    Applicant: OXENO OLEFINCHEMIE GMBH
    Inventors: Armin RIX, Frank Hoper, Jochen Praefke, Wilfried Buschken
  • Process for preparing 1-butene from technical mixtures of C4 hydrocarbons
    Publication number: 20070149839
    Abstract: The invention relates to a process for preparing 1-butene from technical mixtures which comprise at least 1-butene, isobutene, n-butane and 2-butenes by partial conversion of the isobutene present, distillative removal of a fraction comprising 1-butene and isobutene, and conversion of the isobutene present therein to tert-butyl ethers.
    Type: Application
    Filed: September 15, 2006
    Publication date: June 28, 2007
    Applicant: Degussa AG
    Inventors: Armin Rix, Udo Peters, Jochen Praefke, Dirk Roettger, Franz Nierlich
  • Preparation of highly pure methyl tert-butyl ether
    Publication number: 20060264681
    Abstract: The invention relates to a process for preparing methyl tert-butyl ether (MTBE) in qualities which are suitable for organic syntheses and for use as a specialty solvent from MTBE in fuel quality.
    Type: Application
    Filed: June 14, 2003
    Publication date: November 23, 2006
    Applicant: OXENO OLEFINCHEMIE GMBH
    Inventors: Fritz Obenaus, Wilhelm Droste, Bernhard Scholz, Franz Nierlich, Rainer Malzkorn, Udo Peters, Jochen Praefke, Richard Filipiak, Joachim Neumeister
  • Method for producing butene oligomers and tert-butylethers from c4 flows containing isobutene
    Publication number: 20060122444
    Abstract: The invention relates to a process for preparing butene oligomers and tert-butyl ethers from C4 hydrocarbon streams, by converting the isobutene to butene oligomers and tert-butyl ethers and removing them from the C4 streams.
    Type: Application
    Filed: December 3, 2003
    Publication date: June 8, 2006
    Inventors: Udo Peters, Dieter Reusch, Andreas Beckmann, Dirk Roettger, Jochen Praefke