Patents by Inventor Andreas Woelfert

Andreas Woelfert 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: 20250033020
    Abstract: An internal loop reactor comprises: a vertically disposed cylindrical vessel comprising a sidewall and reactor fluid outlet means; and at least one draft tube arranged vertically within the vessel. The draft tube(s) have/s an inner surface and an outer surface, wherein the draft tube(s) provide(s) (a) first conduit(s) within the draft tube(s) having a tube inlet end and a tube outlet end, and a second conduit outside of the draft tube(s) and within the sidewall, the first conduit(s) being in fluid communication with the second conduit. The reactor comprises at least one nozzle arranged concentrically to the draft tube(s) for injecting a fluid into the first conduit(s) from the tube inlet end. The inner surface of the draft tube(s) convexly curves so that the first conduit(s) exhibit(s) an annular constriction of the cross-section between the tube inlet end and the tube outlet end; wherein the constriction is located closer to the tube inlet end.
    Type: Application
    Filed: December 7, 2022
    Publication date: January 30, 2025
    Inventors: Ralf Dirk LOEFFLER, Andreas WOELFERT, Erik Johannes VON HARBOU, Bernhard BRUNNER
  • Publication number: 20240216861
    Abstract: The invention relates to a process for decomposing nitrous oxide from a gas stream (1).
    Type: Application
    Filed: January 5, 2022
    Publication date: July 4, 2024
    Inventors: Andreas WOELFERT, Michael LORENZ, Gerrit WATERS, Marcu REBLE, Holger FRIEDRICH, Andreas WEICKGENANNT, Wolfgang GMEINER
  • Publication number: 20190100547
    Abstract: The present invention relates to a method for preparing 2?-O-fucosyllactose and to the protected fucosyl donor of the formula (I) used in this method. The method comprises reacting the fucose derivative of the formula (I) below with the compound of the general formula (II), in the presence of an activating reagent.
    Type: Application
    Filed: March 8, 2017
    Publication date: April 4, 2019
    Inventors: MICHAEL PUHL, Stephanie RENZ, Andreas WOELFERT
  • Patent number: 9067872
    Abstract: A process for compressing a hydrogen-sulfide-comprising gas stream, which comprises (i) compressing the hydrogen-sulfide-comprising gas stream in a compressor, (ii) flushing the compressor with a mixture comprising dialkyl polysulfides, dialkyl disulfides and at least one amine; a process for producing sulfur compounds, selected from the group consisting of alkylmercaptans, dialkyl disulfides and alkanesulfonic acids, which comprises the conversion of hydrogen-sulfide-comprising gas streams, wherein the hydrogen-sulfide-comprising gas streams are compressed according to the process comprising steps i) and ii); and also the use of a mixture comprising dialkyl polysulfides, dialkyl disulfides and at least one amine for removing sulfur deposits which occur in the compression of hydrogen-sulfide-comprising gas streams.
    Type: Grant
    Filed: December 22, 2009
    Date of Patent: June 30, 2015
    Assignee: BASF SE
    Inventors: Andreas Woelfert, Frank Grzonkowski, Harald Jachow, Guenter Renz
  • Patent number: 8580208
    Abstract: The present invention describes a reactor (1) for continuously preparing hydrogen sulfide H2S from hydrogen and sulfur, comprising a distributor device (15) for distributing gaseous hydrogen in a sulfur melt (9) present at least in a lower part of the reactor. The distributor device (15) is arranged in the sulfur melt (9) and comprises a distributor plate (16) which is arranged in the reactor (1) and has an edge (17) extending downward and, if appropriate, has passage orifices (19). The hydrogen from a hydrogen bubble which forms below the distributor plate (16) is (for example through the passage orifices (19)) distributed in the sulfur melt (9) via the distributor plate (16).
    Type: Grant
    Filed: December 9, 2010
    Date of Patent: November 12, 2013
    Assignee: BASF SE
    Inventors: Andreas Woelfert, Herald Jachow, Heinz Driess
  • Patent number: 8546606
    Abstract: The invention relates to a process for preparing polyisocyanates by reacting primary amines with phosgene, which comprises the steps a) mixing the amine with the phosgene, b) reacting the amine with the phosgene in a residence reactor and, if desired, c) transferring the output from the reactor of step b) into a distillation column, wherein the residence reactor in step b) is configured as a tube reactor.
    Type: Grant
    Filed: February 20, 2004
    Date of Patent: October 1, 2013
    Assignee: BASF Aktiengesellschaft
    Inventors: Andreas Brodhagen, Martin Sohn, Filip Nevejans, Eckhard Stroefer, Andreas Woelfert, Steffen Oehlenschlaeger
  • Patent number: 8436204
    Abstract: The invention provides a process for preparing isocyanates by reacting amines with phosgene, wherein the amine or a mixture of amine and a solvent is mixed in the form of an aerosol with gaseous phosgene and the amine is subsequently reacted with phosgene.
    Type: Grant
    Filed: July 5, 2007
    Date of Patent: May 7, 2013
    Assignee: BASF Aktiengesellschaft
    Inventors: Carsten Knoesche, Eckhard Stroefer, Dieter Stuetzer, Bernd Sachweh, Markus Linsenbuhler, Andreas Woelfert
  • Patent number: 8288584
    Abstract: The present invention relates to a process for preparing diisocyanates from diamines and phosgene in the gas phase.
    Type: Grant
    Filed: September 11, 2008
    Date of Patent: October 16, 2012
    Assignee: BASF SE
    Inventors: Carsten Knoesche, Andreas Woelfert, Torsten Mattke, Eckhard Stroefer, Heinrich-Josef Blankertz, Bernhard Geissler
  • Patent number: 8258337
    Abstract: The present invention relates to a process for preparing isocyanates and an apparatus suitable for this purpose, and also its use. In the process, an amine and phosgene, both in the gas phase, react in the presence of an inert medium. A number, n, of amine streams are reacted with a number, n +1, of phosgene streams in a reactor. The number n is a positive integer of at least 1. All amine and phosgene streams are introduced into the reactor through annular gaps for mixing.
    Type: Grant
    Filed: August 23, 2006
    Date of Patent: September 4, 2012
    Assignee: BASF Aktiengesellschaft
    Inventors: Andreas Woelfert, Carsten Knoesche, Andreas Daiss, Tsung-Chieh Cheng, Torsten Mattke, Eckhard Stroefer
  • Patent number: 8173833
    Abstract: The present invention relates to a process for preparing isocyanates.
    Type: Grant
    Filed: November 6, 2007
    Date of Patent: May 8, 2012
    Assignee: BASF Aktiengesellschaft
    Inventors: Andreas Woelfert, Andreas Daiss, Torsten Mattke
  • Patent number: 8168818
    Abstract: The invention relates to a process for preparing isocyanates in the gas phase.
    Type: Grant
    Filed: November 6, 2007
    Date of Patent: May 1, 2012
    Assignee: BASF Aktiengesellschaft
    Inventors: Andreas Daiss, Andreas Woelfert, Carsten Knoesche, Eckhard Stroefer
  • Patent number: 8088944
    Abstract: Isocyanates are prepared by a process in which a product stream from the isocyanate synthesis is purified.
    Type: Grant
    Filed: September 20, 2006
    Date of Patent: January 3, 2012
    Assignee: BASF SE
    Inventors: Andreas Woelfert, Hans-Juergen Pallasch, Eckhard Stroefer, Heinrich-Josef Blankertz
  • Publication number: 20110263894
    Abstract: A process for compressing a hydrogen-sulfide-comprising gas stream, which comprises (i) compressing the hydrogen-sulfide-comprising gas stream in a compressor, (ii) flushing the compressor with a mixture comprising dialkyl polysulfides, dialkyl disulfides and at least one amine; a process for producing sulfur compounds, selected from the group consisting of alkylmercaptans, dialkyl disulfides and alkanesulfonic acids, which comprises the conversion of hydrogen-sulfide-comprising gas streams, wherein the hydrogen-sulfide-comprising gas streams are compressed according to the process comprising steps i) and ii); and also the use of a mixture comprising dialkyl polysulfides, dialkyl disulfides and at least one amine for removing sulfur deposits which occur in the compression of hydrogen-sulfide-comprising gas streams.
    Type: Application
    Filed: December 22, 2009
    Publication date: October 27, 2011
    Applicant: BASF SE
    Inventors: Andreas Woelfert, Frank Grzonkowski, Harald Jachow, Guenter Renz
  • Patent number: 7994361
    Abstract: The invention relates to a process for preparing aromatic diisocyanates by reaction of phosgene with diamines in the gas phase, in which the reaction is carried out in a reaction zone at moderate pressures, i.e. the pressure in this reaction zone is more than 3 bar and less than 20 bar.
    Type: Grant
    Filed: July 24, 2003
    Date of Patent: August 9, 2011
    Assignee: BASF Aktiengesellschaft
    Inventors: Andreas Woelfert, Christian Mueller, Eckhard Stroefer, Markus Weber, Joachim Pfeffinger, Carsten Knoesche
  • Patent number: 7915444
    Abstract: The present invention relates to a process for preparing diisocyanates from diamines and phosgene in the gas phase.
    Type: Grant
    Filed: July 31, 2006
    Date of Patent: March 29, 2011
    Assignee: BASF Aktiengesellschaft
    Inventors: Andreas Woelfert, Carsten Knoesche, Manfred Heilig, Eckhard Stroefer
  • Patent number: 7851648
    Abstract: The invention relates to a process for preparing polyisocyanates by reacting organic amines with phosgene, wherein the reaction is carried out in at least three stages, with the first stage being carried out in a mixing apparatus, the second stage in at least one residence apparatus and the third stage in at least one separation apparatus and the pressure in each successive stage being lower than that in the previous stage.
    Type: Grant
    Filed: December 13, 2003
    Date of Patent: December 14, 2010
    Assignee: BASF Aktiengesellschaft
    Inventors: Martin Sohn, Eckhard Stroefer, Filip Nevejans, Ulrich Penzel, Hans-Juergen Pallasch, Rene Leuthold, Andreas Brodhagen, Andreas Woelfert, Wolfgang Mackenroth, Markus Maurer
  • Publication number: 20100217035
    Abstract: The present invention relates to a process for preparing diisocyanates from diamines and phosgene in the gas phase.
    Type: Application
    Filed: September 11, 2008
    Publication date: August 26, 2010
    Applicant: BASF SE
    Inventors: Carsten Knoesche, Andreas Woelfert, Torsten Mattke, Eckhard Stroefer, Heinrich-Josef Blankertz, Bernhard Geissler
  • Publication number: 20100076218
    Abstract: The invention relates to a process for preparing isocyanates in the gas phase.
    Type: Application
    Filed: November 6, 2007
    Publication date: March 25, 2010
    Applicant: BASF SE
    Inventors: Andreas Daiss, Andreas Woelfert, Carsten Knoesche, Eckhard Stroefer
  • Publication number: 20100056822
    Abstract: The invention relates to a process for preparing isocyanates in the gas phase.
    Type: Application
    Filed: November 6, 2007
    Publication date: March 4, 2010
    Applicant: BASF SE
    Inventors: Andreas Daiss, Andreas Woelfert, Carsten Knoesche, Eckhard Stroefer
  • Publication number: 20100041914
    Abstract: The present invention relates to a process for preparing isocyanates.
    Type: Application
    Filed: November 6, 2007
    Publication date: February 18, 2010
    Applicant: BASF SE
    Inventors: Andreas Woelfert, Andreas Daiss, Torsten Mattke