Patents by Inventor Ulrich Neutzler

Ulrich Neutzler 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).

  • Process for the distillation of crude ester in the DMT/PTA process
    Patent number: 6180817
    Abstract: A process for preparing crude dimethyl terephthalate, comprises oxidizing a mixture comprising para-xylene and methyl para-toluate, esterifying the oxidized mixture with methanol, separating the resulting crude ester into fractions. By separating the crude ester with a distillation column containing structured packing and using a lower bottom temperature, product yield is increased, and the process is made more economical.
    Type: Grant
    Filed: September 16, 1998
    Date of Patent: January 30, 2001
    Assignee: Huels Aktiengesellschaft
    Inventors: Udo Lenz, Ulrich Neutzler, Anton Schoengen, Reinhard Sigg
  • Process for the distillation of crude ester in the DMT/PTA process
    Patent number: 6096171
    Abstract: A process for purifying a crude ester containing dimethyl terephthalate, includes flash distilling a mixture including para-xylene and methyl para-toluate, and separating the crude ester into fractions. By separating the crude ester with a distillation column containing structured packing and using a lower bottom temperature, product yield is increased, and the process is made more economical.
    Type: Grant
    Filed: May 13, 1998
    Date of Patent: August 1, 2000
    Assignee: Huels Aktiengesellschaft
    Inventors: Udo Lenz, Ulrich Neutzler, Anton Schoengen, Reinhard Sigg
  • Process for the distillation of crude ester in the DMT/PTA process
    Patent number: 5852201
    Abstract: A process for preparing crude dimethyl terephthalate, comprises oxidizing a mixture comprising para-xylene and methyl para-toluate, esterifying the oxidized mixture with methanol, separating the resulting crude ester into fractions. By separating the crude ester with a distillation column containing structured packing and using a lower bottom temperature, product yield is increased, and the process is made more economical.
    Type: Grant
    Filed: January 17, 1997
    Date of Patent: December 22, 1998
    Assignee: Huels Aktiengesellschaft
    Inventors: Udo Lenz, Ulrich Neutzler, Anton Schoengen, Reinhard Sigg