Patents by Inventor Emmerich Pflegerl

Emmerich Pflegerl 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).

  • Apparatus for the esterification of terephthalic acid in the gas phase
    Patent number: 4015943
    Abstract: Dimethyl terephthalate is prepared by the continuous esterification of terephthalic acid in the gas phase by evaporating solid terephthalic acid in a pre-reactor by means of a hot methanol vapor stream, conducting the gas mixture through a solid bed catalyst in a follow-up reactor, and recirculating a portion of the reaction product to the pre-reactor. After the pre-reactor the terephthalic acid dispersed in the methanol gas phase is heated and vaporized in one or more consecutive heat exchangers followed by one or more dwell period lengths and immediately heated to the esterification temperature prior to entry into the follow-up reactor.
    Type: Grant
    Filed: April 21, 1976
    Date of Patent: April 5, 1977
    Assignee: Chemische Werke Huls Aktiengesellschaft
    Inventors: Horst-Dieter Wulf, Ferdinand List, Friedrich-August Orlowski, Norbert Wilke, Emmerich Pflegerl
  • Process for the esterification of terephthalic acid in the gas phase
    Patent number: 3972912
    Abstract: Dimethyl terephthalate is prepared by the continuous esterification of terephthalic acid in the gas phase by evaporating solid terephthalic acid in a pre-reactor by means of a hot methanol vapor stream, conducting the gas mixture through a solid bed catalyst in a follow-up reactor, and recirculating a portion of the reaction product to the pre-reactor. After the pre-reactor the terephthalic acid dispersed in the methanol gas phase is heated and vaporized in one or more consecutive heat exchangers followed by one or more dwell period lengths and immediately heated to the esterification temperature prior to entry into the follow-up reactor.
    Type: Grant
    Filed: November 29, 1973
    Date of Patent: August 3, 1976
    Assignee: Chemische Werke Huls Aktiengesellschaft
    Inventors: Horst-Dieter Wulf, Ferdinand List, Friedrich-August Orlowski, Norbert Wilke, Emmerich Pflegerl