The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 11, 2006
Filed:
Aug. 21, 2003
Mario J. Nappa, Newark, DE (US);
Velliyur Nott Mallikarjuna Rao, Wilmington, DE (US);
H. David Rosenfeld, Drumore, PA (US);
Shekhar Subramoney, Hockessin, DE (US);
Munirpallam A. Subramanian, Kennett Square, PA (US);
Allen C. Sievert, Elkton, MD (US);
Mario J. Nappa, Newark, DE (US);
Velliyur Nott Mallikarjuna Rao, Wilmington, DE (US);
H. David Rosenfeld, Drumore, PA (US);
Shekhar Subramoney, Hockessin, DE (US);
Munirpallam A. Subramanian, Kennett Square, PA (US);
Allen C. Sievert, Elkton, MD (US);
E. I. du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
A process for the preparation of pentafluoroethane is disclosed which involves contacting a mixture comprising hydrogen fluoride and at least one starting material selected from haloethanes of the formula CXCHXand haloethanes of the formula CX═CX, where each X is independently selected from the group consisting of F and Cl (provided that no more than four of X are F), with a fluorination catalyst in a reaction zone to produce a product mixture comprising HF, HCl, pentafluoroethane, underfluorinated halogenated hydrocarbon intermediates and less than 0.2 mole percent chloropentafluoroethane based on the total moles of halogenated hydrocarbons in the product mixture. The process is characterized by the fluorination catalyst comprising (i) a crystalline cobalt-substituted alpha-chromium oxide where from about 0.05 atom % to about 6 atom % of the chromium atoms in the alpha-chromium oxide lattice are replaced by trivalent cobalt (Co) and/or (ii) a fluorinated crystalline oxide of (i).