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:
Apr. 15, 2003
Filed:
Jan. 30, 2002
William H. Manogue, Newark, DE (US);
V. N. Mallikarjuna Rao, Wilmington, DE (US);
Allen Capron Sievert, Elkton, MD (US);
Steven H. Swearingen, Wilmington, DE (US);
E. I. du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
A process is disclosed for producing the pentfluropropenes of the formula CF CX═CF , where X is H or Cl. The process involves hydrodehalogenating CF CCl CF with hydrogen at an elevated temperature in the vapor phase over a catalyst comprising an elemental metal, metal oxide, metal halide and/or metal oxyhalide (the metal being copper, nickel, chromium and the halogen of said halides and said oxyhalides being fluorine and/or chlorine. Processes for producing the hydrofluorocarbons CF CH CHF , CF CHFCF and CF CH CF are also disclosed which involve (a) hydrodehalogenating CF CCl CF with the hydrogen as indicated above to produce a product comprising CF CCl═CF , CF CH═CF , HCl and HF; and (b) either reacting the CF CCl═CF and/or CF CH═CF produced in (a) in the vapor phase with hydrogen to produce CF CH CHF , reacting CF CCl═CF produced in (a) with HF to produce CF CHFCF , or reacting the CF CH═CF produced in (a) with HF to produce CF CH CF . Azeotrope compositions of CF CHFCH with HF, and a process for recovering HF from a product mixture comprising HF and CF CHFCF are also disclosed. Also disclosed are compositions and a process for producing compositions comprising (c1) CF CHFCF , CF CH CF or CHF CH CF and (c2) at least one saturated halogenated hydrocarbon and/or ether having the formula: C H Cl F O wherein n is an integer from 1 to 4, a is an integer from 0 to 2n+1, b is an integer from 1 to 2n+2−a, and c is 0 or 1, provided that when c is 1 then n is an integer from 2 to 4, and provided that component (c2) does not include the selected component (c1) compound, wherein the molar ratio of component (c2) to component (c1) is between about 1:99 and a molar ratio of HF to component (c1) in an azeotrope or azeotrope-like composition of component (c1) with HF. The process involves (A) combining (i) the azeotropic composition with (ii) the fluorination precursor to component (c2); and (B) reacting a sufficient amount of the HF from the azeotrope or azeotrope-like composition(i) with precursor component (ii) to provide a composition containing components (c1) and (c2) in the desired ratio. The compositions include at least two (c1) compounds, at least one of which is an ether.