Patents by Inventor David H. Rosenfeld

David H. Rosenfeld 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 Preparation of 1,1,1,3,3-Penta-Fluoropropane and/or 1,1,1,3,3,3-Hexafluoropropane
    Publication number: 20090137853
    Abstract: A process for the manufacture of CF3CH2CHF2 and/or CF3CH2CF3 is disclosed. The process involves (a) reacting HF and at least one halopropene of the formula CX3CCI?CCIX (where each X is independently F or Cl) to produce a product including both CF3CCI?CF2 and CF3CHCICF3; (b) reacting CF3CCI?CF2 and/or CF3CHCICF3 produced in (a) with hydrogen to produce a product including CF3CH2CHF2 and/or CF3CH2CF3; and (c) recovering CF3CH2CHF2 and/or CF3CH2CF3 from the product produced in (b). In (a), the CF3CCI?CF2 and CF3CHCICF3 are produced in the presence of a fluorination catalyst comprising at least one chromium-containing component selected from (i) a crystalline alpha-chromium oxide where at least 0.05 atom % of the chromium atoms in the alpha-chromium oxide lattice are replaced by divalent copper, and (ii) a chromium-containing composition of (i) which has been treated with a fluorinating agent.
    Type: Application
    Filed: August 4, 2006
    Publication date: May 28, 2009
    Inventors: Velliyur Nott Mallikarjuna Rao, David H. Rosenfeld, Allen Capron Sievert, Shekhar Subramoney