Chlorofluorocarbon isomerization

Details Chlorofluorocarbon isomerization Chlorofluorocarbon isomerization

1994-10-14

1995-05-16

Siegel, Alan

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

570176, C07C 1908, C07C 2118

Patent

active

054162467

ABSTRACT:
A process is disclosed for producing a saturated gem-dichloro chlorofluorocarbon product of the formula C.sub.n Cl.sub.a F.sub.b, wherein n is 2 to 12, a is 2 to 4, and b is 4 to 24, and wherein a+b equals 2n+2 when the chlorofluorocarbon is acyclic and equals 2n when the chlorofluorocarbon is cyclic, from a starting material of the same formula which has a lesser thermodynamic stability than the saturated gem-dichloro chlorofluorocarbon product. The process involves isomerizing the starting material in the presence of (1) a catalyst of the formula AlZ.sub.3, where Z is selected from F, Cl and/or Br (provided that AlZ.sub.3 cannot be entirely AlF.sub.3) and (2) an effective amount of promoter selected from the group consisting of is selected from hexafluoropropene, 2-chloropentafluoropropene, perfluorobutenes, perfluoropentenes, perfluorocyclobutene, 1-chlorocyclobutene, 1,2-dichlorocyclobutene, perfluorocyclopentene, 1-chlorocyclopentene, and 1,2-dichlorocyclopentene, and mixtures thereof, to accelerate production of the saturated gem-dichloro chlorofluorocarbon product. Also disclosed is a process for producing a halohydrocarbon of the formula C.sub.n H.sub.c Cl.sub.d F.sub.b from a gem-dichloro product produced by said isomerization (where c is 1 to 4 and c+equals a) which involves hydrodechlorinating the gem-dichloro product.

REFERENCES:
patent: 2942036 (1951-06-01), Smith et al.
patent: 3598411 (1952-05-01), Miller et al.
patent: 4748284 (1988-05-01), Gozzo et al.
patent: 4925993 (1990-05-01), Zawalski
patent: 5017732 (1991-05-01), Zawalski
patent: 5068473 (1991-11-01), Kellner et al.
patent: 5157171 (1992-10-01), Sievert et al.
patent: 5162594 (1992-11-01), Krespan

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