Patents by Inventor Lars Padeken

Lars Padeken 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 the preparation of isocyanates in the gas phase
    Patent number: 9365503
    Abstract: Meta-toluene-diisocyanate is produced by reacting meta-toluenediamine with phosgene in the gas phase. The meta-toluenediamine to be vaporized for use in this phosgenation process must contain less than 0.5 wt. % of toluenediamine residue, a total of less than 0.2 wt. % of ammonia and cycloaliphatic amines, and less than 20 ppm of heavy metals. At least 0.1 wt. % of the liquid meta-toluenediamine being to be vaporized must not be vaporized. This non-vaporized content of the meta-toluenediamine must not be fed to the phosgenation reactor.
    Type: Grant
    Filed: December 14, 2009
    Date of Patent: June 14, 2016
    Assignee: Covestro Deutschland AG
    Inventors: Klaus Biskup, Rainer Bruns, Wolfgang Lorenz, Lars Padeken, Bernd Pennemann, Fritz Pohl, Andreas Rausch, Friedhelm Steffens
  • Process for the production of aromatic diisocyanates in the gas
    Patent number: 8399702
    Abstract: Aromatic diisocyanates are produced by reacting in the gas phase the corresponding primary aromatic diamine with phosgene. The phosgene and the primary aromatic diamine are reacted within a mean residence time of from 0.05 to 15 seconds. The aromatic diamine used contains less than 0.05 mole % overall of aliphatic amine containing no keto groups, per mole of primary amino groups.
    Type: Grant
    Filed: November 20, 2008
    Date of Patent: March 19, 2013
    Assignee: Bayer MaterialScience AG
    Inventors: Fritz Pohl, Klaus Biskup, Rainer Bruns, Friedhelm Steffens, Lars Padeken
  • Process for the preparation of toluene-diisocyanate
    Patent number: 8063241
    Abstract: The present invention relates to a process for the preparation of toluene-diisocyanate. In this process, toluenediamine is reacted with phosgene to give crude toluene-diisocyanate, the crude toluene-diisocyanate is purified by distillation, the distillation residue formed during the distillation is hydrolysed at temperatures of less than 230° C. under absolute pressures of less than 30 bar, and the toluenediamine formed by this process is subsequently recycled into the reaction of toluenediamine and phosgene.
    Type: Grant
    Filed: September 30, 2010
    Date of Patent: November 22, 2011
    Assignee: Bayer MaterialScience AG
    Inventors: Wolfgang Lorenz, Lars Padeken, Bernd Pennemann, Friedhelm Steffens, Lothar Weismantel
  • PROCESS FOR THE PREPARATION OF TOLUENE-DIISOCYANATE
    Publication number: 20110021811
    Abstract: The present invention relates to a process for the preparation of toluene-diisocyanate. In this process, toluenediamine is reacted with phosgene to give crude toluene-diisocyanate, the crude toluene-diisocyanate is purified by distillation, the distillation residue formed during the distillation is hydrolysed at temperatures of less than 230° C. under absolute pressures of less than 30 bar, and the toluenediamine formed by this process is subsequently recycled into the reaction of toluenediamine and phosgene.
    Type: Application
    Filed: September 30, 2010
    Publication date: January 27, 2011
    Applicant: Bayer MaterialScience AG
    Inventors: Wolfgang Lorenz, Lars Padeken, Bernd Pennemann, Friedhelm Steffens, Lothar Weismantel
  • PROCESS FOR THE PREPARATION OF ISOCYANATES IN THE GAS PHASE
    Publication number: 20100160674
    Abstract: Meta-toluene-diisocyanate is produced by reacting meta-toluenediamine with phosgene in the gas phase. The meta-toluenediamine to be vaporized for use in this phosgenation process must contain less than 0.5 wt. % of toluenediamine residue, a total of less than 0.2 wt. % of ammonia and cycloaliphatic amines, and less than 20 ppm of heavy metals. At least 0.1 wt. % of the liquid meta-toluenediamine being to be vaporized must not be vaporized. This non-vaporized content of the meta-toluenediamine must not be fed to the phosgenation reactor.
    Type: Application
    Filed: December 14, 2009
    Publication date: June 24, 2010
    Applicant: Bayer MaterialScience AG
    Inventors: Klaus Biskup, Rainer Bruns, Wolfgang Lorenz, Lars Padeken, Bernd Pennemann, Fritz Pohl, Andreas Rausch, Friedhelm Steffens
  • Process for the production of aromatic discocyanates in the gas
    Publication number: 20090149672
    Abstract: Aromatic diisocyanates are produced by reacting in the gas phase the corresponding primary aromatic diamine with phosgene. The phosgene and the primary aromatic diamine are reacted within a mean residence time of from 0.05 to 15 seconds. The aromatic diamine used contains less than 0.05 mole % overall of aliphatic amine containing no keto groups, per mole of primary amino groups.
    Type: Application
    Filed: November 20, 2008
    Publication date: June 11, 2009
    Inventors: Fritz Pohl, Klaus Biskup, Rainer Bruns, Friedhelm Steffens, Lars Padeken
  • Process for the preparation of toluenediamines by catalytic hydrogenation of dinitrotoluenes
    Patent number: 7511176
    Abstract: The present invention relates to a process for the preparation of toluenediamine, in which dinitrotoluene is reacted with hydrogen in the presence of a catalyst. The dinitrotoluene required by this process has a content of carbon dioxide, in either physically dissolved or chemically bonded form, of not more than 0.175 mol %, based on the molar amount of the dinitrotoluene.
    Type: Grant
    Filed: December 13, 2007
    Date of Patent: March 31, 2009
    Assignee: Bayer MaterialScience AG
    Inventors: Fritz Pohl, Wolfgang Lorenz, Lars Padeken, Bernd Pennemann, Friedhelm Steffens, Gerhard Wiechers
  • Process for the preparation of toluenediamines by catalytic hydrogenation of dinitrotoluenes
    Publication number: 20080146847
    Abstract: The present invention relates to a process for the preparation of toluenediamine, in which dinitrotoluene is reacted with hydrogen in the presence of a catalyst. The dinitrotoluene required by this process has a content of carbon dioxide, in either physically dissolved or chemically bonded form, of not more than 0.175 mol %, based on the molar amount of the dinitrotoluene.
    Type: Application
    Filed: December 13, 2007
    Publication date: June 19, 2008
    Inventors: Fritz Pohl, Wolfgang Lorenz, Lars Padeken, Bernd Pennemann, Friedhelm Steffens, Gerhard Wiechers
  • Process for the preparation of toluene-diisocyanate
    Publication number: 20080146835
    Abstract: The present invention relates to a process for the preparation of toluene-diisocyanate. In this process, toluenediamine is reacted with phosgene to give crude toluene-diisocyanate, the crude toluene-diisocyanate is purified by distillation, the distillation residue formed during the distillation is hydrolysed at temperatures of less than 230° C. under absolute pressures of less than 30 bar, and the toluenediamine formed by this process is subsequently recycled into the reaction of toluenediamine and phosgene.
    Type: Application
    Filed: December 13, 2007
    Publication date: June 19, 2008
    Inventors: Wolfgang Lorenz, Lars Padeken, Bernd Pennemann, Friedhelm Steffens, Lothar Weismantel