Patents by Inventor Reinhard Freyhof

Reinhard Freyhof 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 producing pure trioxane
    Publication number: 20050176973
    Abstract: A process for preparing trioxane by trimerization of formaldehyde in aqueous acidic solution and subsequently removing trioxane from a mixture substantially comprising trioxane, water and formaldehyde (crude trioxane product), which comprises a) distilling the crude trioxane product from the trimerization, b) crystallizing the trioxane out and c) removing it from the mother liquor and d) subsequently melting it and e) distilling off further by-products.
    Type: Application
    Filed: May 13, 2003
    Publication date: August 11, 2005
    Inventors: Katrin Friese, Matthias Rauls, Reinhard Freyhof, Thorsten Friese, Harald Armbruster, Hartmut Zeiner, Gitta Egbers, Eckhard Strofer, Ludwig Heck, Peter Hildenbrand
  • Method for trioxane isolation
    Patent number: 6200429
    Abstract: A process for isolating trioxane from an aqueous mixture which includes trioxane, water and formaldehyde, including removing trioxane from the mixture by pervaporation, and subjecting the mixture enriched in trioxane (permeate) to rectification to give trioxane and an azeotropic mixture of trioxane, water and formaldehyde.
    Type: Grant
    Filed: January 11, 2000
    Date of Patent: March 13, 2001
    Assignee: BASF Aktiengesellschaft
    Inventors: Reinhard Freyhof, Stefan Bitterlich, Hugues Vandenmersch