Gem-dihydropolyfluoroalkanes and monohydropolyfluoroalkenes, pro

Details Gem-dihydropolyfluoroalkanes and monohydropolyfluoroalkenes, pro Gem-dihydropolyfluoroalkanes and monohydropolyfluoroalkenes, pro

1991-08-28

1993-12-07

Albrecht, Dennis

Compositions

Water-softening or purifying or scale-inhibiting agents

252162, 252170, 252172, 252364, 252DIG9, 570134, C11D 730, C11D 750, C23G 5028, C23G 5032

Patent

active

052681220

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.

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