Purifaction of pentafluoroethanes

Details Purifaction of pentafluoroethanes Purifaction of pentafluoroethanes

1996-07-30

1997-07-15

Siegel, Alan

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

Organic compounds

Halogen containing

C07C 1738

Patent

active

056485697

ABSTRACT:
Mixtures of CClF.sub.2 CF.sub.3 (CFC-115) and CHF.sub.2 CF.sub.3 (HFC-125) can be substantially separated by using carbon nanotubes as a sorbent for CClF.sub.2 CF.sub.3. A process is described for treating a starting mixture of CHF.sub.2 CF.sub.3 and CClF.sub.2 CF.sub.3 to provide a product wherein the mole ratio of CHF.sub.2 CF.sub.3 to CClF.sub.2 CF.sub.3 is increased relative to the mole ratio of CHF.sub.2 CF.sub.3 to CClF.sub.2 CF.sub.3 in the starting mixture; and another process (involving desorbing sorbed CClF.sub.2 CF.sub.3) is disclosed for treating a starting mixture of CClF.sub.2 CF.sub.3 and CHF.sub.2 CF.sub.3 to provide a product mixture wherein the mole ratio of CClF.sub.2 CF.sub.3 to CHF.sub.2 CF.sub.3 is increased relative to the mole ratio of CClF.sub.2 CF.sub.3 to CHF.sub.2 CF.sub.3 in the starting mixture. The process for producing a CHF.sub.2 CF.sub.3 -enriched product and the process for producing a CClF.sub.2 CF.sub.3 -enriched product may be integrated into an overall process (e.g., a thermal swing cycle process) where both of said products are provided. Production of high purity HFC-125 is disclosed.

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patent: 5087329 (1992-02-01), Felix
patent: 5210342 (1993-05-01), Moore
T.W. Ebbesen & P.M. Ajayan, "Large-scale synthesis of carbon nanotubes", Letters to Nature, 358, pp. 220-222, 16 Jul. 1992.
Szostak, R., Molecular Sieves: Principles of Synthesis and Identification, Van Nostrand Reinhold, p. 2 (1989).

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