| 摘要 |
<p>A process is disclosed for producing a saturated gem-dichloro chlorofluorocarbon product of the formula CnClaFb, 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 AlZ3, where Z is selected from F, Cl and/or Br (provided that AlZ3 cannot be entirely AlF3) and (2) an effective amount of promoter selected from the group consisting of 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 CnHcCldFb from a gem-dichloro product produced by said isomerization (where c is 1 to 4 and c + d equals a) which involves hydrodechlorinating the gem-dichloro product.</p> |
