Claims
- 1. A process for separating a fluorinated aliphatic hydrocarbon of the formula
- CH.sub.a F.sub.3-a --CH.sub.2 --CH.sub.b F.sub.3-b
- wherein a is 0 or the integer 1 or 2 and b is 0 or the integer 1, 2 or 3, from a hydrogen fluoride-containing reaction mixture said separation comprising
- a. adding to said reaction mixture an organic or inorganic salt thereby forming a mixture containing a separate phase enriched with said aliphatic fluorinated hydrocarbon and then separating from said mixture said phase enriched with said aliphatic fluorinated hydrocarbon, said organic or inorganic salt being
- I. unreactive to the components contained in the reaction mixture;
- ii. substantially insoluble in said separate phase that is enriched with said fluorinated aliphatic hydrocarbon; and
- iii. separable from the mixture that is formed after separation of the phase enriched in said fluorinated aliphatic hydrocarbon, and
- b. separating the fluorinated aliphatic hydrocarbon from the phase enriched in said fluorinated aliphatic hydrocarbon.
- 2. The process according to claim 1 wherein said organic salt is ammonium fluoride or a lower alkyl ammonium fluoride.
- 3. The process according to claim 2 wherein said organic salt is ammonium fluoride or selected from the group consisting of mono, di, tri or tetra C.sub.1 to C.sub.3 linear or branched alkyl ammonium fluoride.
- 4. The process according to claim 3 wherein said organic salt is ammonium fluoride, monomethylammonium fluoride, dimethylammonium fluoride, monoethylammonium fluoride and diethylammonium fluoride.
- 5. The process according to claim 4 wherein said organic salt is ammonium fluoride.
- 6. The process according to claim 1 wherein the inorganic salt is a fluoride or a bifluoride of the metals of Group Ia of the Periodic Table of the Elements.
- 7. The process according to claim 6 wherein said inorganic salt is a fluoride or a bifluoride of an alkali metal selected from the group consisting of lithium, sodium and potassium.
- 8. The process according to claim 7 wherein said inorganic salt is a fluoride of sodium or of potassium.
- 9. The process according to claim 1 wherein quantity of organic or inorganic salt added to the reaction mixture is directly proportional to the amount of fluorinated aliphatic hydrocarbon that appears in the enriched, liquid separate phase.
- 10. The process according to claim 9 wherein said quantity of organic or inorganic salt is from about 0.01 mole of salt per mole of hydrogen fluoride to about 0.25 mole of salt per mole of hydrogen fluoride.
- 11. The process according to claim 10 wherein said quantity of organic or inorganic salt is from about 0 02 mole of salt per mole of hydrogen fluoride to about 0.20 mole of salt per mole of hydrogen fluoride.
- 12. The process according to claim 11 wherein said quantity of organic or inorganic salt is from about 0.05 mole of salt per mole of hydrogen fluoride to about 0.10 mole of salt per mole of hydrogen fluoride.
Parent Case Info
This application is a continuation of Ser. No. 08/559,779 filed Aug. 28, 1995 now U.S. Pat. No. 5,616,819.
US Referenced Citations (6)
Continuations (1)
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519779 |
Aug 1995 |
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