Patents by Inventor Siegmund Greschek

Siegmund Greschek 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 preparing phenols
    Patent number: 6875898
    Abstract: The present invention relates to a process for preparing phenols by adding an aqueous base to the reaction product from the acid-catalyzed cleavage of alkylaryl hydroperoxides while maintaining a homogeneous phase prior to the work-up of the product.
    Type: Grant
    Filed: April 4, 2003
    Date of Patent: April 5, 2005
    Assignee: Ineos Phenol GmbH & Co. KG
    Inventors: Manfred Weber, Reinhard Sigg, Michael Lausmann, Siegmund Greschek
  • Process for preparing phenols
    Publication number: 20030220528
    Abstract: The present invention relates to a process for preparing phenols by adding an aqueous base to the reaction product from the acid-catalyzed cleavage of alkylaryl hydroperoxides while maintaining a homogeneous phase prior to the work-up of the product.
    Type: Application
    Filed: April 4, 2003
    Publication date: November 27, 2003
    Inventors: Manfred Weber, Reinhard Sigg, Michael Lausmann, Siegmund Greschek
  • Process for preparing phenols
    Patent number: 6630608
    Abstract: The present invention relates to a process for preparing phenols, in which the pH of the reaction product from the acid-catalyzed cleavage of alkylaryl hydroperoxides is set to a value of at least 8 at a temperature of at least 100° C. prior to the work-up of the product. This measure enables the content of undesirable by-products, e.g. hydroxyacetone, in the cleavage product to be significantly reduced. This procedure is particularly advantageously integrated into a process for preparing phenols by: a) acid-catalyzed cleavage of alkylaryl hydroperoxides and b) thermal after-treatment of the cleavage product from step a), with the temperature in step b) being higher than in step a) and is at least 100° C., wherein the adjustment to a pH of at least 8 is carried out after the thermal after-treatment and prior to cooling of the cleavage product.
    Type: Grant
    Filed: March 4, 2002
    Date of Patent: October 7, 2003
    Assignee: INEOS Phenol & GmbH Co., KG
    Inventors: Uwe Tanger, Reinhard Sigg, Siegmund Greschek, Manfred Weber
  • Process for preparing phenols
    Publication number: 20020183563
    Abstract: The present invention relates to a process for preparing phenols, in which the pH of the reaction product from the acid-catalyzed cleavage of alkylaryl hydroperoxides is set to a value of at least 8 at a temperature of at least 100° C. prior to the work-up of the product. This measure enables the content of undesirable by-products, e.g. hydroxyacetone, in the cleavage product to be significantly reduced.
    Type: Application
    Filed: March 4, 2002
    Publication date: December 5, 2002
    Inventors: Uwe Tanger, Reinhard Sigg, Siegmund Greschek, Manfred Weber