Claims
- 1. A process of purification of 1,1,1,3,3-pentafluoropropane characterized by contacting at least one extraction agent selected from the group consisting of(a) a fluorohydrocarbon compound corresponds to the general formula (I): CxFyHz (I) in which x is an integer from 3 to 10, y is an integer from 2 to 22 and z is an integer from 0 to 6;(b) an amine compound corresponds to the general formula (II): R1R2R3N (II) in which R1, R2 and R3 are fluoroalkyl groups each having 1-10 carbon atoms, respectively, and R1, R2 and R3 may have at most two hydrogen atoms, respectively;(c) an ether compound corresponds to the general formula (III): R4OR5 (III) in which R4 and R5 are alkyl groups each having 1-10 carbon atoms, respectively, and at least one of R4 and R5 contains one fluorine atom; and(d) a chlorohydocarbon compound corresponds to the general formula (IV): ClClmHn (IV) in which 1 is an integer from 3 to 10, m is an integer from 2 to 22 and n is an integer from 0 to 6with a mixture comprising 1,1,1,3,3-pentafluoropropane and hydrogen fluoride so as to form a liquid mixture and separating the liquid mixture into two liquid layers, followed by obtaining an extraction agent layer including 1,1,1,3,3-pentafluoropropane and the extraction agent as the main components, and separatively recovering 1,1,1,3,3-pentafluoropropane from the extraction agent layer.
- 2. The process according to claim 1 wherein the extraction agent to be used is at least one compound selected from the group consisting of the following (a) to (d):(a) perfluoro-2-methylpentane, perfluoro-n-hexane, 1,1,1,2,2,3,4,5,5,5-decafluoropentane, perfluoro-2-methyl-2-pentene, perfluoro-4-methyl-2-pentene, ω-H perfluorooctane(C8F17H)) and ω-H perfluorohexane; (b) perfluorotributylamine and perfluorotripentylamine; (c) methyl-1,1,1,2,3,3-hexafluoropropylether, ethyl-1,1,1,2,3,3-hexafluoropropylether and propyl-1,1,1,2,3,3-hexafluoropropylether, 1-methoxy-nonafluorobutane, and 1-ethoxy-nonafluorobutane; and (d) 1,1,1,3,3-pentachloropropane, hexachloropropane, trichloroethylene, and perchloroethylene.
- 3. The process according to claim 1 wherein an amount of the extraction agent used in the contacting step is in the range from 0.3 to 30 times as much as an amount of 1,1,1,3,3-pentafluoropropane in a molar ratio.
- 4. The process according to claim 1 wherein the separating step is performed at a temperature in a range from −30° C. to 100° C. and a pressure in a range from 1 to 30 atm.
- 5. The process according to claim 1 wherein the mixture comprises HCl and the other fluorohydrocarbon(s).
- 6. The process according to claim 1 wherein 1,1,1,3,3-pentafluoropropane is separatively recovered by distilling the extraction agent layer, and simultaneously the extraction agent is separated and recycled to the contacting step.
- 7. The process according to claim 1 wherein the extraction agent and 1,1,1,3,3-pentafluoropropane, or the extraction agent is removed from a layer containing hydrogen fluoride as a main component obtained through separating the resulted mixture into the liquid layers, and the balance is recovered or recycled to a reaction step.
- 8. The process according to claim 1 wherein a mixture containing 1,1,1,3,3-pentafluoropropane and hydrogen fluoride obtained from the reaction of 1,1,1,3,3-pentachloropropane with hydrogen fluoride is contacted with 1,1,1,3,3-pentachloropropane as the extraction agent so as to form a resulted mixture and the resulted mixture is separated into the two liquid layers; and 1,1,1,3,3-pentafluoropropane is selectively recovered from the extraction agent layer containing the extraction agent and 1,1,1,3,3-pentafluoropropane as the main components; and the layer containing hydrogen fluoride as a main component is recycled to the reaction without removing the extraction agent.
- 9. The process according to claim 8 wherein, after 1,1,1,3,3-pentafluoropropane is removed, the layer containing hydrogen fluoride as the main component is recycled to the reaction without removing the extraction agent.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8-167440 |
Jun 1996 |
JP |
|
Parent Case Info
This application is the national phase under 35 U.S.C. §371 of prior PCT International Application No. PCT/JP97/02102 which has an International filing date of Jun. 19, 1997 which designated the United States of America.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
102e Date |
371c Date |
PCT/JP97/02102 |
|
WO |
00 |
12/22/1998 |
12/22/1998 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO97/49656 |
12/31/1997 |
WO |
A |
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