Patents by Inventor Hans-Jürgen Pallasch

Hans-Jürgen Pallasch 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).

  • Reaction column in a special combination with a natural circulation evaporator
    Patent number: 7544832
    Abstract: An arrangement for carrying out chemical reactions comprises at least one distillation column and/or at least one container and at least one circulation evaporator, which are connected to one another via connecting elements, liquid being taken off completely or partly from a tray or from a stacked packing bed or from a dumped packing bed or from a liquid collector of the distillation column or being fed as an external feed stream below the lower tube sheet of the circulation evaporator to said evaporator.
    Type: Grant
    Filed: February 15, 2002
    Date of Patent: June 9, 2009
    Assignee: BASF Aktiengesellschaft
    Inventors: Jan Peter Bredehöft, Hans-Jürgen Pallasch, Ludwig E. Heck, Eckhard Ströfer
  • Method for separating out solvent from a reaction mixture resulting from an isocyanate synthesis and for purifying this solvent
    Patent number: 7524405
    Abstract: The invention relates to a process for preparing isocyanates by reaction of amines with phosgene in the presence of inert organic solvents in a reactor and subsequent work-up of the reaction mixture leaving the reactor, wherein the solvent is separated off in a two-stage or multistage, preferably two-stage, distillation process in which the solvent is separated off at a pressure of 0.1-15 bar in a first apparatus and at 1-900 mbar in a second apparatus or further apparatuses, with the heat of condensation of the solvent vapor from the first apparatus being used for partial or complete vaporization of solvent in the second apparatus.
    Type: Grant
    Filed: December 13, 2003
    Date of Patent: April 28, 2009
    Assignee: BASF Aktiengesellschaft
    Inventors: Martin Sohn, Eckhard Stroefer, Filip Nevejans, Ulrich Penzel, Hans-Juergen Pallasch, Peter Van Den Abeel, Filip Deberdt, Jan D. Jacobs, Wolfgang Mackenroth
  • Method for the purification of isocyanates
    Patent number: 7358388
    Abstract: Isocyanates are prepared by a process in which a product stream from the isocyanate synthesis is purified.
    Type: Grant
    Filed: December 16, 2003
    Date of Patent: April 15, 2008
    Assignee: BASF Aktiengesellschaft
    Inventors: Andreas Woelfert, Hans-Juergen Pallasch, Eckhard Stroefer, Heinrich-Josef Blankertz
  • Method for the distillative recovery of toluylenediamine
    Patent number: 7342134
    Abstract: The invention relates to a process for distillatively preparing TDA from a reactant stream comprising TDA, high boilers and low boilers in a dividing wall column in which a dividing wall is disposed in the longitudinal direction of the column to form an upper combined column region (2), a lower combined column region (3), a feed section (4) having a rectifying section (5) and stripping section (6), and also a withdrawal section (7) having a rectifying section (9) and stripping section (8), which comprises the following steps: a. feeding the reactant stream (13) into the feed section (4) of the dividing wall column (1); b. drawing off a low boiler fraction via the top of the column (11); c. drawing off TDA via a side draw (14) in the withdrawal section (7) of the dividing wall column (1); d. drawing off a low boiler fraction via the bottom of the column (12).
    Type: Grant
    Filed: January 7, 2005
    Date of Patent: March 11, 2008
    Assignee: BASF Aktiengesellschaft
    Inventors: Carsten Knoesche, Martin Sohn, Ulrich Penzel, Hans-Juergen Pallasch, Gunter Georgi, Wolfgang Mackenroth, Hans Volkmar Schwarz, Stefan Maixner, Gerald Molz, Eckhard Stroefer