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:
Dec. 07, 1993
Filed:
Aug. 28, 1991
V N Rao, Wilmington, DE (US);
Frank J Weigert, Wilmington, DE (US);
Carl G Krespan, Wilmington, DE (US);
E. I. du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
A catalyic process is disclosed for producing fluorine-substituted hydrocarbon products of the formulae RCH.sub.2 CF.sub.2 R and RFC.dbd.CHR at an elevated temperature, from compounds of the formula RCHFCHFR, where each R is independently selected from the group consisting of --CF.sub.3, --CF.sub.2 CF.sub.3 and --CF.sub.2 CF.sub.2 CF.sub.3 or where both R groups of a formula together are --(CF.sub.2).sub.2 --, --(CF.sub.2).sub.3 -- or --(CF.sub.2).sub.4 --. Suitable catalysts include carbon catalysts and catalysts containing at least one compound of a selected metal (e.g., Na, K, Rb, Cs, Y, La, Ce, Pr, Nd, Sm, Cr, Fe, Co, Rh, Ni, Cu, and/or Zn) supported on carbon. The saturated gem-dihydro- products may also be produced by hydrofluorinating the corresponding olefinic product over such catalysts at an elevated temperature, and can be combined with various other miscible solvents to form compositions useful for cleaning. Compounds such as CF.sub.3 CF.sub.2 CH.sub.2 CF.sub.2 CF.sub.3, CF.sub.3 CF.sub.2 CH.sub.2 (CF.sub.2).sub.2 CF.sub.3, CF.sub.3 CH.dbd.CF(CF.sub.2).sub.2 CF.sub.3, CF.sub.3 CF=CH(CF.sub.2).sub.2 CF.sub.3, CF.sub.3 CF.sub.2 CH.sub.2 (CF.sub.2).sub.3 CF.sub.3, CF.sub.3 (CF.sub.2).sub.2 CH.sub.2 (CF.sub.2).sub.2 CF.sub.3, CF.sub.3 CH.dbd.CF(CF.sub.2).sub.3 CF.sub.3, CF.sub.3 CF.dbd.CH(CF.sub.2).sub.3 CF.sub.3, CF.sub.3 (CF.sub.2).sub.2 CH.sub.2 (CF.sub.2).sub.3 CF.sub.3, CF.sub.3 CF.sub.2 CH.sub.2 (CF.sub.2).sub.4 CF.sub.3, CF.sub.3 CH.dbd.CF(CF.sub.2).sub.4 CF.sub.3, CF.sub.3 CF=CH(CF.sub.2).sub.4 CF.sub.3, CF.sub.3 CF.sub.2 CH.dbd.CF(CF.sub.2).sub.3 CF.sub.3, CF.sub.3 CF.sub.2 CF=CH(CF.sub.2).sub. 3 CF.sub.3 and ##STR1## and azeotropic compositions such as azeotropes of CF.sub.3 CH.sub.2 CF.sub.2 CF.sub.2 CF.sub.3 and/or CF.sub.3 CF.sub.2 CH.sub.2 CF.sub.2 CF.sub.3 with methanol, ethanol, or isopropanol are disclosed.