Patents by Inventor Stefan Wershofen

Stefan Wershofen 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).

  • Publication number: 20170114000
    Abstract: The invention relates to a method for the preparation of di- and polyamines of the diphenylmethane series, care being taken during the shutdown of the production process that an excess of aniline and respect to formalin is ensured.
    Type: Application
    Filed: June 22, 2015
    Publication date: April 27, 2017
    Inventors: Thomas Knauf, Stefan Wershofen, Klaus-Gerd Gruner, Volker Hartjes
  • Publication number: 20170107171
    Abstract: The invention relates to a method for the preparation of di- and polyamines of the diphenylmethane series (MDA) from aniline and formaldehyde, care being taken during the start up that a sufficient excess of aniline with respect to formaldehyde is ensured, said excess amounting to at least 105% of the desired molar ratio of aniline to formaldehyde for the target recipe of the MDA to be produced.
    Type: Application
    Filed: June 22, 2015
    Publication date: April 20, 2017
    Inventors: Thomas Knauf, Stefan Wershofen, Klaus-Gerd Gruner, Volker Hartjes
  • Patent number: 9593075
    Abstract: The invention relates to a method for preparing isocyanates by phosgenating the corresponding amines, wherein low-boiling secondary components, excess phosgene, and the co-product hydrogen chloride are separated from the crude liquid isocyanate stream, which is obtained after the phosgenation has occurred, within a maximum of 60 minutes, and wherein the crude liquid isocyanate stream is not exposed to temperatures above 250° C. until said separation.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: March 14, 2017
    Assignee: Covestro Deutschland AG
    Inventors: Rainer Bruns, Wolfgang Lorenz, Andreas Karl Rausch, Stefan Wershofen, Tim Loddenkemper
  • Publication number: 20160376228
    Abstract: The invention relates to a method for preparing isocyanates by phosgenating the corresponding amines, wherein low-boiling secondary components, excess phosgene, and the co-product hydrogen chloride are separated from the crude liquid isocyanate stream, which is obtained after the phosgenation has occurred, within a maximum of 60 minutes, and wherein the crude liquid isocyanate stream is not exposed to temperatures above 250° C. until said separation.
    Type: Application
    Filed: September 7, 2016
    Publication date: December 29, 2016
    Inventors: Rainer Bruns, Wolfgang Lorenz, Andreas Karl Rausch, Stefan Wershofen, Tim Loddenkemper
  • Patent number: 9475762
    Abstract: Urethanes are prepared by oxidative carbonylation of at least one amino compound in the presence of carbon monoxide, oxygen and organic, at least one hydroxyl-group-carrying compound. The carbonylation is carried out in the absence of halogen-containing promoters. The carbonylation is also carried out in the presence of a metal complex catalyst which contains neutral bidentate N-chelate ligands of the (N˜N) type, two monoanionic N,O-chelate ligands of the general type (N˜O)? or tetradentate dianionic chelate ligands (O˜N˜N˜O)2?.
    Type: Grant
    Filed: February 4, 2016
    Date of Patent: October 25, 2016
    Assignee: Covestro Deutschland AG
    Inventors: Andreas Jacob, Stefan Wershofen, Stephan Klein, Jorg Sundermeyer, Fuming Mei
  • Patent number: 9416094
    Abstract: The invention relates to a method for producing diamines and polyamines of the diphenylmethane series in which, by using a coalescence auxiliary in the phase separation of the process product obtained in the scrubbing of the neutralized crude product, the fraction of water and thus also of water-soluble impurities in the organic MDA-containing phase is reduced. According to the invention, the coalescence auxiliary used is a filter bed made of coalescence fiber material. The di- and polyamines of the diphenylmethane series obtained after distillative purification of this MDA-containing organic phase are exceptionally suitable for the preparation of the corresponding isocyanates.
    Type: Grant
    Filed: April 8, 2014
    Date of Patent: August 16, 2016
    Assignee: Covestro Deutschland AG
    Inventors: Thomas Knauf, Wolfgang Lorenz, Stefan Wershofen, Richard Adamson, Karsten Becker
  • Publication number: 20160194277
    Abstract: The present invention relates to metallic zinc cluster compounds which are suitable as catalysts in the reaction of amines with dialkyl carbonates to produce carbamates. The invention is also directed towards a method for the alkoxycarbonylation of amines. The cluster compound has a general formula which may be written as [M(O2C—R)2]x.[MO]y.[H2O]z, wherein M is Zn, R is an unsubstituted or substituted aromatic, cycloaliphatic, linear aliphatic, or other organic rest, x is 1, y is ?x is 1, y is ?0.03 to ?26.0 and z is >0.00 to ?17.0.
    Type: Application
    Filed: May 19, 2014
    Publication date: July 7, 2016
    Applicant: Covestro Deutschland AG
    Inventors: Thorsten Dreier, Stefan Wershofen, Anton Vidal, Robert Haak
  • Publication number: 20160152559
    Abstract: Urethanes are prepared by oxidative carbonylation of at least one amino compound in the presence of carbon monoxide, oxygen and organic, at least one hydroxyl-group-carrying compound. The carbonylation is carried out in the absence of halogen-containing promoters. The carbonylation is also carried out in the presence of a metal complex catalyst which contains neutral bidentate N-chelate ligands of the (N˜N) type, two monoanionic N,O-chelate ligands of the general type (N˜O)? or tetradentate dianionic chelate ligands (O˜N˜N˜O)2?.
    Type: Application
    Filed: February 4, 2016
    Publication date: June 2, 2016
    Inventors: Andreas Jacob, Stefan Wershofen, Stephan Klein, Jorg Sundermeyer, Fuming Mei
  • Patent number: 9328064
    Abstract: The invention relates to a process for the preparation of isocyanates by reaction of the corresponding amines with phosgene in the gas phase, wherein a diluent containing between 90.0000% by weight and 99.9999% by weight of substances which are inert in the phosgenation process and between 0.0001% by weight and 10.0000% by weight of oxygen is present during the conversion of the amine into the gas phase and the molar ratio of amine to oxygen (O2) is ?1,000:1.
    Type: Grant
    Filed: July 2, 2015
    Date of Patent: May 3, 2016
    Assignee: Bayer MaterialScience AG
    Inventors: Rainer Bruns, Wolfgang Lorenz, Andreas Karl Rausch, Stefan Wershofen, Tim Loddenkemper
  • Patent number: 9309184
    Abstract: The invention relates to a method for producing diamines and polyamines of the diphenylmethane series, wherein first aniline and formaldehyde are reacted in the absence of an acidic catalyst to form a reaction mixture containing animal and water and, after the water has been separated the aminal is reacted by acid catalysis to form a reaction mixture containing diamines and polyamines of the diphenylmethane series, wherein the separation of the water from the aminal is supported by the use of a coalescence aid. According to the invention, a filter bed made front coalescence fiber material is used an coalescence aid.
    Type: Grant
    Filed: April 9, 2014
    Date of Patent: April 12, 2016
    Assignee: Covestro Deutschland AG
    Inventors: Thomas Knauf, Wolfgang Lorenz, Stefan Wershofen, Richard Adamson, Karsten Becker
  • Patent number: 9284267
    Abstract: Urethanes are prepared by oxidative carbonylation of at least one amino compound in the presence of carbon monoxide, oxygen and organic, at least one hydroxyl-group-carrying compound. The carbonylation is carried out in the absence of halogen-containing promoters. The carbonylation is also carried out in the presence of a metal complex catalyst which contains neutral bidentate N-chelate ligands of the (N˜N) type, two monoanionic N,O-chelate ligands of the general type (N˜O)? or tetradentate dianionic chelate ligands (O˜N˜N˜O)2?.
    Type: Grant
    Filed: January 28, 2009
    Date of Patent: March 15, 2016
    Assignee: Bayer MaterialScience AG
    Inventors: Andreas Jacob, Stefan Wershofen, Stephan Klein, Jörg Sundermeyer, Fuming Mei
  • Publication number: 20160068474
    Abstract: The present invention provides a process for preparing di- and polyamines from the diphenylmethane series by converting aniline and formaldehyde in the absence of an acid catalyst to give aminal and water, removing the aqueous phase and further processing the organic aminal phase to give the di- and polyamines of the diphenylmethane series, in which use of a coalescence aid in the phase separation of the process product obtained in aminal reaction reduces the proportion of water and hence also of water-soluble impurities in the organic phase containing the aminal. The di- and polyamines of the diphenylmethane series obtained by acid-catalysed rearrangement and workup after further processing of the aminal phase are outstanding suitably for preparation of the corresponding isocyanates.
    Type: Application
    Filed: April 22, 2014
    Publication date: March 10, 2016
    Inventors: Thomas Knauf, Stefan Wershofen, Klaus-Gerd Gruner, Esteve Obis Torruella
  • Publication number: 20160068475
    Abstract: The invention relates to a method for producing diamines and polyamines of the diphenylmethane series, wherein first aniline and formaldehyde are reacted in the absence of an acidic catalyst to form a reaction mixture containing aminal and water and, after the water has been separated the aminal is reacted by acid catalysis to form a reaction mixture containing diamines and polyamines of the diphenylmethane series, wherein the separation of the water from the aminal is supported by the use of a coalescence aid. According to the invention, a filter bed made from coalescence fiber material is used an coalescence aid.
    Type: Application
    Filed: April 9, 2014
    Publication date: March 10, 2016
    Inventors: Thomas Knauf, Wolfgang Lorenz, Stefan Wershofen, Richard Adamson, Karsten Becker
  • Publication number: 20160068473
    Abstract: The invention relates to a method for producing diamines and polyamines of the diphenylmethane series, wherein first aniline and formaldehyde are reacted in the absence of an acidic catalyst to form a reaction mixture containing aminal and water and, after the water has been separated, the aminal is reacted by acid catalysis to form a reaction mixture containing diamines and polyamines of the dephenylmethane series, wherein the separation of the water and aminal is supported by the use of a coalescence aid. According to the invention, a filter bed made of coalescence fiber material is used as coalescence aid.
    Type: Application
    Filed: April 8, 2014
    Publication date: March 10, 2016
    Inventors: Thomas Knauf, Wolfgang Lorenz, Stefan Wershofen, Richard Adamson, Karsten Becker
  • Patent number: 9279029
    Abstract: The invention relates to a method for producing light-coloured polyisocyanates by phosgenation of mixtures comprising MDA and polycyclic aromatic polyamines that have o-phenylenediamine units incorporated via methylene bridges. The invention further relates to the polyisocyanate mixtures obtainable by this method.
    Type: Grant
    Filed: October 18, 2012
    Date of Patent: March 8, 2016
    Assignee: Bayer Intellectual Property GmbH
    Inventors: Thomas Ernst Mueller, Christoph Guertler, Axel Scherer-Werke, Stefan Wershofen, Henning Vogt, Walter Leitner
  • Patent number: 9272988
    Abstract: The invention relates to a method for producing organic diisocyanates by reacting the corresponding diamines with phosgene in inert solvents. High-melting diamines from the series of 1,5-naphthalenediamine, tetralindiamine, 1,4-phenylenediamine, durenediamine, and o-tolidinediamine are used as diamines. According to the invention, a suspension of the diamines in inert solvents is produced, wherein dynamic mixing units, selected from dispersion disks and rotor-stator systems, are used, and the obtained suspension is phosgenated.
    Type: Grant
    Filed: September 18, 2013
    Date of Patent: March 1, 2016
    Assignee: Covestro Deutschland AG
    Inventors: Jörg Laue, Christian Steffens, Jens Krause, Stefan Wershofen, Werner Kilian, Marc Seekamp, Matthias Ruhland
  • Patent number: 9199924
    Abstract: The invention relates to a method for producing urethanes or ureas or mixtures of urethanes and ureas by oxidative carbonylation of organic amines in the presence of carbon monoxide, oxygen and a catalyst, where the catalyst used is a transition metal complex containing the structural feature: [Mn+(O˜N˜O)2?](n?2)+(L)m(Z?)n?2 and the method is carried out under halogen-free reaction conditions. The invention further relates to transition metal complexes containing said structural feature and also to the use of such transition metal complexes as catalysts in the production of urethanes or ureas or mixtures of urethanes and ureas.
    Type: Grant
    Filed: August 9, 2011
    Date of Patent: December 1, 2015
    Assignee: Bayer Intellectual Property GmbH
    Inventors: Felix Gärtner, Andreas Jacob, Jörg Sundermeyer, Stephan Klein, Stefan Wershofen
  • Publication number: 20150299111
    Abstract: The invention relates to a process for the preparation of isocyanates by reaction of the corresponding amines with phosgene in the gas phase, wherein a diluent containing between 90.0000% by weight and 99.9999% by weight of substances which are inert in the phosgenation process and between 0.0001% by weight and 10.0000% by weight of oxygen is present during the conversion of the amine into the gas phase and the molar ratio of amine to oxygen (O2) is ?1,000:1.
    Type: Application
    Filed: July 2, 2015
    Publication date: October 22, 2015
    Inventors: Rainer BRUNS, Wolfgang LORENZ, Andreas Karl RAUSCH, Stefan WERSHOFEN, Tim LODDENKEMPER
  • Publication number: 20150291512
    Abstract: The invention relates to a method for preparing isocyanates by phosgenating the corresponding amines, wherein low-boiling secondary components, excess phosgene, and the co-product hydrogen chloride are separated from the crude liquid isocyanate stream, which is obtained after the phosgenation has occurred, within a maximum of 60 minutes, and wherein the crude liquid isocyanate stream is not exposed to temperatures above 250° C. until said separation.
    Type: Application
    Filed: March 15, 2013
    Publication date: October 15, 2015
    Applicant: Bayer Intellectual Property GmbH
    Inventors: Rainer Burns, Wolfgang Orenz, Andreas KArl Rausch, Stefan Wershofen
  • Publication number: 20150246873
    Abstract: The invention relates to a method for producing organic diisocyanates by reacting the corresponding diamines with phosgene in inert solvents. High-melting diamines from the series of 1,5-naphthalenediamine, tetralindiamine, 1,4-phenylenediamine, durenediamine, and o-tolidinediamine are used as diamines. According to the invention, a suspension of the diamines in inert solvents is produced, wherein dynamic mixing units, selected from dispersion disks and rotor-stator systems, are used, and the obtained suspension is phosgenated.
    Type: Application
    Filed: September 18, 2013
    Publication date: September 3, 2015
    Applicant: BAYER MATERIALSCIENCE AG
    Inventors: Jörg Laue, Christian Steffens, Jens Krause, Stefan Wershofen, Werner Kilian, Marc Seekamp, Mathias Ruhland