Patents by Inventor Andreas Wolfert

Andreas Wolfert 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: 20090317322
    Abstract: The invention relates to a process and to an apparatus for preparing hydrogen sulfide H2S by converting a reactant mixture which comprises gaseous sulfur and hydrogen over a solid catalyst. The reactant mixture is converted at a pressure of from 0.5 to 10 bar absolute, a temperature of from 300 to 450° C. and a sulfur excess in a reactor (1). The sulfur excess corresponds to a ratio of excess sulfur to H2S prepared of from 0.2 to 3 kg of sulfur per kg of H2S prepared.
    Type: Application
    Filed: January 14, 2008
    Publication date: December 24, 2009
    Applicant: BASE SE
    Inventors: Andreas Wölfert, Herald Jachow, Heinz Driess
  • Publication number: 20090221846
    Abstract: The present invention relates to a process for preparing isocyanates and an apparatus suitable for this purpose, and also its use.
    Type: Application
    Filed: August 23, 2006
    Publication date: September 3, 2009
    Applicant: BASF SE
    Inventors: Andreas Wölfert, Carsten Knösche, Andreas Daiss, Tsung-Chieh Cheng, Torsten Mattke, Eckhard Stroefer
  • Publication number: 20090112018
    Abstract: The invention provides a process for preparing isocyanates by reacting the corresponding amines with phosgene in the presence of solvents, wherein compounds which form salt melts with hydrogen chloride are used as solvents.
    Type: Application
    Filed: October 22, 2005
    Publication date: April 30, 2009
    Applicant: BASF Aktiengesellschaft
    Inventors: Martin Sesing, Hartwig Voss, Eckhard Stroefer, Thorsten Rohde, Andreas Wolfert
  • Publication number: 20080262263
    Abstract: The present invention comprises a process for purifying isocyanate-comprising residues.
    Type: Application
    Filed: September 21, 2006
    Publication date: October 23, 2008
    Applicant: BASF SE
    Inventors: Andreas Wolfert, Carsten Knosche, Matthias Klotzer, Hermann Ascherl, Eckhard Stroefer, Heinrich-Josef Blankertz, Michael Schonherr, Martin Karches, Christian Benz
  • Publication number: 20080200722
    Abstract: The present invention relates to a process for preparing diisocyanates from diamines and phosgene in the gas phase.
    Type: Application
    Filed: July 31, 2006
    Publication date: August 21, 2008
    Applicant: BASF SE
    Inventors: Andreas Wolfert, Carsten Knosche, Manfred Heilig, Eckhard Stroefer
  • Publication number: 20080027242
    Abstract: The invention relates to a process for preparing isocyanates by reacting amines with phosgene in the gas phase in a reaction zone, with the reaction mixture being passed through a zone into which a liquid is sprayed to stop the reaction, wherein the reaction mixture is passed through a zone having a reduced flow cross section between the reaction zone and the zone into which the liquid is sprayed.
    Type: Application
    Filed: June 22, 2005
    Publication date: January 31, 2008
    Applicant: BASF Aktiengesellschaft
    Inventors: Carsten Knosche, Andreas Wolfert, Andreas Daiss
  • Publication number: 20070293707
    Abstract: The invention relates to a process for separating hydrogen chloride and phosgene, which comprises bringing a mixture of hydrogen chloride and phosgene into contact with an ionic liquid in which at least part of the hydrogen chloride is dissolved in a step a) and then separating off the hydrogen chloride dissolved in the ionic liquid in a step b).
    Type: Application
    Filed: September 10, 2005
    Publication date: December 20, 2007
    Applicant: BASF Aktiengesellschaft
    Inventors: Andreas Wolfert, Carsten Knosche, Hans-Jurgen Pallasch, Martin Sesing, Eckhard Stroefer, Hans-Martin Polka, Manfred Heilig
  • Publication number: 20070232827
    Abstract: A process for the preparation of isocyanates by reacting amines with phosgene, the phosgene-containing stream of starting materials (i) being substantially free of isocyanates and (ii) having a mass content of hydrogen chloride (referred to below as HCl) of less than 0.4% by mass, and a production plant for carrying out the process according to the invention.
    Type: Application
    Filed: May 21, 2002
    Publication date: October 4, 2007
    Applicant: BASF Aktiengesellschaft
    Inventors: Andreas Wolfert, Hans-Jurgen Pallasch, Eckhard Stroefer, Ulrich Penzel, Filip Deberdt
  • Publication number: 20070015934
    Abstract: Isocyanates are prepared by a process in which a product stream from the isocyanate synthesis is purified.
    Type: Application
    Filed: September 20, 2006
    Publication date: January 18, 2007
    Applicant: BASF Aktiengesellschaft
    Inventors: Andreas Wolfert, Hans-Jurgen Pallasch, Eckhard Stroefer, Heinrich-Josef Blankertz
  • Publication number: 20060223966
    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: Application
    Filed: February 20, 2004
    Publication date: October 5, 2006
    Applicant: BASF Aktiengesellschaft
    Inventors: Andreas Brodhagen, Martin Sohn, Filip Nevejans, Eckhard Stroefer, Andreas Wölfert, Steffen Oehlenschläger
  • Publication number: 20060135810
    Abstract: Isocyanates are prepared by a process in which a product stream from the isocyanate synthesis is purified.
    Type: Application
    Filed: December 16, 2003
    Publication date: June 22, 2006
    Applicant: BASF Aktiengesellschaft
    Inventors: Andreas Wolfert, Hans-Jurgen Pallasch, Eckhard Stroefer, Heinrich-Josef Blankertz
  • Publication number: 20060116529
    Abstract: The invention provides a process for preparing isocyanates by reacting amines with phosgene, wherein the phosgene-containing feed stream has a hydrogen chloride content of more than 0.8% by mass.
    Type: Application
    Filed: December 16, 2003
    Publication date: June 1, 2006
    Applicant: BASF AKTIENGESELLSCHAFT
    Inventors: Andreas Wolfert, Hans-Jurgen Pallasch, Eckhard Stroefer, Ulrich Penzel, Filip Deberdt
  • Publication number: 20060052629
    Abstract: Isocyanates are prepared by reacting primary amines with phosgene in a reactor by a process in which a reaction discharge is present in the form of a suspension which contains the isocyanate to be prepared, as a liquid, and carbamyl chlorides as a solid, and the suspension is worked up in a film evaporator, and this process is carried out in a production plant.
    Type: Application
    Filed: September 18, 2003
    Publication date: March 9, 2006
    Applicant: BASF Aktiengesellschaft
    Inventors: Eckhard Strofer, Stephan Scholl, Martin Sohn, Andreas Wolfert, Hans-Jurgen Pallasch, Jan Bredehoft
  • Patent number: 6986833
    Abstract: An amine-containing mixture containing one or more amines, water, low-boilers and optionally high-boilers is fractionated by a process having the steps (iii) and (iv) and optionally the steps (i), (ii) and (v): (i) a (first) low-boiler fraction is separated off from the amine-containing mixture by distillation, (ii) a (first) high-boiler fraction is separated off from the amine-containing mixture by distillation, (iii) the amine-containing mixture is extracted with sodium hydroxide solution, producing an aqueous, sodium-hydroxide-containing first phase and an aqueous-organic, amine-, (further) low-boiler- and possibly (further) high-boiler-containing second phase, (iv) the aqueous-organic second phase, is distilled, producing essentially anhydrous amine as bottom-phase take off or sidestream takeoff in the stripping part of the distillation column, an amine/water azeotrop as sidestream takeoff in the enrichment part of the column and a (further) low-boiler fraction as overhead takeoff, and recycling the amin
    Type: Grant
    Filed: October 17, 2002
    Date of Patent: January 17, 2006
    Assignee: BASF Aktiengesellschaft
    Inventors: Andreas Wölfert, Heinz Rütter, Stefan Rittinger, Mark Wehinger, Aurelie Alemany, Willi Schmidt
  • Publication number: 20050272910
    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: Application
    Filed: July 24, 2003
    Publication date: December 8, 2005
    Applicant: BASF Aktiengesellschaft
    Inventors: Andreas Wolfert, Christian Muller, Eckhard Strofer, Markus Weber, Joachim Pfeffinger, Carsten Knosche
  • Patent number: 6913674
    Abstract: A mixture containing one or more amines, water, low-boilers and high-boilers, is fractioned in a process wherein (i) low-boilers are separated from the mixture by distillation, (ii) high-boilers are separated from the mixture by distillation, (iii) the mixture is extracted with a sodium hydroxide solution to form an aqueous, sodium-hydroxide-containing first phase and an aqueous-organic, amine-containing second phase, and (iv) the aqueous-organic second phase is distilled to form an amine/water azeotrop and an essentially anhydrous amine, and the amine/water azeotrop is recycled to the extraction step (iii).
    Type: Grant
    Filed: July 12, 2004
    Date of Patent: July 5, 2005
    Assignee: BASF Aktiengesellschaft
    Inventors: Andreas Wölfert, Heinz Rütter, Stefan Rittinger, Mark Wehinger, Aurelie Alemany, Willi Schmidt
  • Patent number: 6896401
    Abstract: In a process for mixing reactant streams (1, 2; 5) to produce a product stream (10) using a mixing configuration (15, 16) having a number of reactant feed points, an excess component stream of one reactant is divided into two reactant substreams (1, 2) and fed into the suction region (3, 4) of a mixing space (12) at right angles to a deficient component (5) entering the mixing space (12).
    Type: Grant
    Filed: June 29, 2001
    Date of Patent: May 24, 2005
    Assignee: BASF Aktiengesellschaft
    Inventors: Andreas Wölfert, Ulrich Penzel
  • Publication number: 20050070734
    Abstract: The invention relates to a method for producing isocyanates by reacting primary amines with phosgene in the gaseous phase. Said method is characterized in that the reaction of amine and phosgene occurs in a reaction channel, the internal dimensions of which have a width/height ratio of at least 2/1.
    Type: Application
    Filed: November 19, 2002
    Publication date: March 31, 2005
    Applicant: BASF Aktiengesellschaft
    Inventors: Andreas Wölfert, Christian Muller, Eckhard Stroefer, Joachim Pfeffinger, Markus Weber, Carsten Knosche
  • Patent number: 6867324
    Abstract: Starting material streams are mixed in a mixer (13) for the phosgenation of amines by a process in which the reaction product (3) is removed in a closed loop and the starting material streams (1.2) contain organic solvents. The main streams (1.1, 2.1) and/or part-streams (1.2, 2.2) of the starting materials (1, 2) come into contact with one another according to the countercurrent principle.
    Type: Grant
    Filed: May 21, 2001
    Date of Patent: March 15, 2005
    Assignee: BASF Aktiengesellschaft
    Inventors: Andreas Wölfert, Ulrich Penzel
  • Publication number: 20050000791
    Abstract: A process for fractionating an amine-containing mixture which comprises one or more amines, water, low-boilers and high-boilers, having the steps (i) to (iv): (i) separating off by distillation low-boilers from the amine-containing mixture, (ii) separating off by distillation high-boilers from the amine-containing mixture, (iii) extracting the amine-containing mixture with sodium hydroxide solution, producing an aqueous, sodium-hydroxide-containing first phase and an aqueous-organic, amine-containing second phase, (iv) distilling the aqueous-organic second phase, producing an amine/water azeotrope and an essentially anhydrous amine, and recycling the amine/water azeotrope to the extraction step (iii).
    Type: Application
    Filed: July 12, 2004
    Publication date: January 6, 2005
    Inventors: Andreas Wolfert, Heinz Rutler, Stefan Rittinger, Mark Wehinger, Aurelie Alemany, Willi Schmidt