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).
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Publication number: 20250033020Abstract: 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: ApplicationFiled: December 7, 2022Publication date: January 30, 2025Inventors: Ralf Dirk LOEFFLER, Andreas WOELFERT, Erik Johannes VON HARBOU, Bernhard BRUNNER
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Publication number: 20240216861Abstract: The invention relates to a process for decomposing nitrous oxide from a gas stream (1).Type: ApplicationFiled: January 5, 2022Publication date: July 4, 2024Inventors: Andreas WOELFERT, Michael LORENZ, Gerrit WATERS, Marcu REBLE, Holger FRIEDRICH, Andreas WEICKGENANNT, Wolfgang GMEINER
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Publication number: 20190100547Abstract: 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: ApplicationFiled: March 8, 2017Publication date: April 4, 2019Inventors: MICHAEL PUHL, Stephanie RENZ, Andreas WOELFERT
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Patent number: 9067872Abstract: 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: GrantFiled: December 22, 2009Date of Patent: June 30, 2015Assignee: BASF SEInventors: Andreas Woelfert, Frank Grzonkowski, Harald Jachow, Guenter Renz
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Patent number: 8580208Abstract: 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: GrantFiled: December 9, 2010Date of Patent: November 12, 2013Assignee: BASF SEInventors: Andreas Woelfert, Herald Jachow, Heinz Driess
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Patent number: 8546606Abstract: 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: GrantFiled: February 20, 2004Date of Patent: October 1, 2013Assignee: BASF AktiengesellschaftInventors: Andreas Brodhagen, Martin Sohn, Filip Nevejans, Eckhard Stroefer, Andreas Woelfert, Steffen Oehlenschlaeger
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Patent number: 8436204Abstract: 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: GrantFiled: July 5, 2007Date of Patent: May 7, 2013Assignee: BASF AktiengesellschaftInventors: Carsten Knoesche, Eckhard Stroefer, Dieter Stuetzer, Bernd Sachweh, Markus Linsenbuhler, Andreas Woelfert
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Patent number: 8288584Abstract: The present invention relates to a process for preparing diisocyanates from diamines and phosgene in the gas phase.Type: GrantFiled: September 11, 2008Date of Patent: October 16, 2012Assignee: BASF SEInventors: Carsten Knoesche, Andreas Woelfert, Torsten Mattke, Eckhard Stroefer, Heinrich-Josef Blankertz, Bernhard Geissler
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Patent number: 8258337Abstract: 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: GrantFiled: August 23, 2006Date of Patent: September 4, 2012Assignee: BASF AktiengesellschaftInventors: Andreas Woelfert, Carsten Knoesche, Andreas Daiss, Tsung-Chieh Cheng, Torsten Mattke, Eckhard Stroefer
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Patent number: 8173833Abstract: The present invention relates to a process for preparing isocyanates.Type: GrantFiled: November 6, 2007Date of Patent: May 8, 2012Assignee: BASF AktiengesellschaftInventors: Andreas Woelfert, Andreas Daiss, Torsten Mattke
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Patent number: 8168818Abstract: The invention relates to a process for preparing isocyanates in the gas phase.Type: GrantFiled: November 6, 2007Date of Patent: May 1, 2012Assignee: BASF AktiengesellschaftInventors: Andreas Daiss, Andreas Woelfert, Carsten Knoesche, Eckhard Stroefer
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Patent number: 8088944Abstract: Isocyanates are prepared by a process in which a product stream from the isocyanate synthesis is purified.Type: GrantFiled: September 20, 2006Date of Patent: January 3, 2012Assignee: BASF SEInventors: Andreas Woelfert, Hans-Juergen Pallasch, Eckhard Stroefer, Heinrich-Josef Blankertz
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Publication number: 20110263894Abstract: 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: ApplicationFiled: December 22, 2009Publication date: October 27, 2011Applicant: BASF SEInventors: Andreas Woelfert, Frank Grzonkowski, Harald Jachow, Guenter Renz
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Patent number: 7994361Abstract: 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: GrantFiled: July 24, 2003Date of Patent: August 9, 2011Assignee: BASF AktiengesellschaftInventors: Andreas Woelfert, Christian Mueller, Eckhard Stroefer, Markus Weber, Joachim Pfeffinger, Carsten Knoesche
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Patent number: 7915444Abstract: The present invention relates to a process for preparing diisocyanates from diamines and phosgene in the gas phase.Type: GrantFiled: July 31, 2006Date of Patent: March 29, 2011Assignee: BASF AktiengesellschaftInventors: Andreas Woelfert, Carsten Knoesche, Manfred Heilig, Eckhard Stroefer
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Patent number: 7851648Abstract: 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: GrantFiled: December 13, 2003Date of Patent: December 14, 2010Assignee: BASF AktiengesellschaftInventors: Martin Sohn, Eckhard Stroefer, Filip Nevejans, Ulrich Penzel, Hans-Juergen Pallasch, Rene Leuthold, Andreas Brodhagen, Andreas Woelfert, Wolfgang Mackenroth, Markus Maurer
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Publication number: 20100217035Abstract: The present invention relates to a process for preparing diisocyanates from diamines and phosgene in the gas phase.Type: ApplicationFiled: September 11, 2008Publication date: August 26, 2010Applicant: BASF SEInventors: Carsten Knoesche, Andreas Woelfert, Torsten Mattke, Eckhard Stroefer, Heinrich-Josef Blankertz, Bernhard Geissler
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Publication number: 20100076218Abstract: The invention relates to a process for preparing isocyanates in the gas phase.Type: ApplicationFiled: November 6, 2007Publication date: March 25, 2010Applicant: BASF SEInventors: Andreas Daiss, Andreas Woelfert, Carsten Knoesche, Eckhard Stroefer
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Publication number: 20100056822Abstract: The invention relates to a process for preparing isocyanates in the gas phase.Type: ApplicationFiled: November 6, 2007Publication date: March 4, 2010Applicant: BASF SEInventors: Andreas Daiss, Andreas Woelfert, Carsten Knoesche, Eckhard Stroefer
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Publication number: 20100041914Abstract: The present invention relates to a process for preparing isocyanates.Type: ApplicationFiled: November 6, 2007Publication date: February 18, 2010Applicant: BASF SEInventors: Andreas Woelfert, Andreas Daiss, Torsten Mattke