Patents by Inventor Wolfram Stüer

Wolfram Stüer 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).

  • Method for the continuous production of a compound that carries at least two functional groups
    Patent number: 7371890
    Abstract: A process for continuously preparing a compound which bears at least two functional groups which are each independently selected from the group consisting of nitrile group, carboxylic acid group, carboxylic ester group and carboxamide group.
    Type: Grant
    Filed: June 11, 2004
    Date of Patent: May 13, 2008
    Assignee: BASF Aktiengesellschaft
    Inventors: Wolfram Stüer, Jens Scheidel, Hartwig Voβ, Peter Baβler, Michael Röper
  • Flexible method for the joint production of (i) formic acid, (ii) a carboxylic acid comprising at least two carbon atoms and/or the derivatives thereof, and (iii) a carboxylic acid anhydride
    Patent number: 7253316
    Abstract: Disclosed is a method for jointly producing (i) formic acid (III); (ii) a carboxylic acid comprising at least two carbon atoms (II) and/or the derivatives thereof; and (iii) a carboxylic acid anhydride (VII). According to said method, (a) a formic acid ester (I) is transesterfied to formic acid (III) and the corresponding carboxylic acid ester (IV) by means of a carboxylic acid comprising at least two carbon atoms (II); (b) at least one portion of the carboxylic acid ester (IV) formed in step (a) is carbonylated in order to obtain the carboxylic acid anhydride (V); and (c) at least one portion of the carboxylic acid anhydride (V) formed in step (b) is further dehydrated by means of a carboxylic acid (VI) so as to form a carboxylic acid anhydride (VII) and the carboxylic acid (II).
    Type: Grant
    Filed: October 21, 2003
    Date of Patent: August 7, 2007
    Assignee: BASF Aktiengesellschaft
    Inventors: Jörg Pastre, Kai Michael Exner, Wolfram Stüer, Elke Geissler, Otto Machhammer
  • Preparation of 1,6-hexanediol
    Patent number: 7064239
    Abstract: The present invention provides a process for preparing 1,6-hexanediol having a purity of ?99.5% by weight by catalytically dimerizing acrylic esters and catalytically hydrogenating the hexenedioic diesters obtained in this way to 1,6-hexanediol by a) dimerizing C1- to C8-acrylic esters in the presence of at least one rhodium compound to give mixtures of predominantly 2- and 3-hexenedioic diesters, b) hydrogenating the resulting dimerizing effluent in the presence of chromium-free catalysts comprising predominantly copper as the hydrogenation component and c) purifying the crude 1,6-hexanediol obtained in this way by fractional distillation.
    Type: Grant
    Filed: December 3, 2003
    Date of Patent: June 20, 2006
    Assignee: BASF Aktiengesellschaft
    Inventors: Rolf-Hartmuth Fischer, Thomas Krug, Andrea Haunert, Michael Röper, Tilman Sirch, Wolfram Stüer
  • Felxible method for the common production of formic acid, a carboxylic acid having at least two carbon atoms, and/or the derivatives of the same
    Patent number: 6992212
    Abstract: Formic acid and a carboxylic acid having at least two carbon atoms and/or derivatives thereof are prepared jointly by a process in which (a) a formic ester (I) is transesterified with a carboxylic acid having at least two carbon atoms (II) to form formic acid (III) and the corresponding carboxylic ester (IV); and (b) at least part of the carboxylic ester (IV) formed in step (a) is carbonylated to give the corresponding carboxylic anhydride (V).
    Type: Grant
    Filed: July 24, 2002
    Date of Patent: January 31, 2006
    Assignee: BASF Aktiengesellschaft
    Inventors: Peter Zehner, Jörg Pastre, Wolfram Stüer