Purification of 1,1,1,3,3-pentafluoropropane

Details Purification of 1,1,1,3,3-pentafluoropropane Purification of 1,1,1,3,3-pentafluoropropane

1996-04-12

1997-12-09

Siegel, Alan

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

Organic compounds

Halogen containing

570178, C07C 1938

Patent

active

056963106

ABSTRACT:
A process for producing a substantially pure polyfluorinated aliphatic hydrocarbon from a crude reaction solution thereof containing unsaturated hydrocarbon and halogenated saturated and unsaturated aliphatic hydrocarbon impurities is disclosed. The process comprises, as a first step, treating said crude reaction solution with a dehydrohalogenation agent that does not substantially react with the polyfluorinated aliphatic hydrocarbon. The treatment converts the halogenated aliphatic impurities into olefinic impurities.
As a second step to the process of this invention, the solution formed from the first step is further treated with an agent that transforms the olefinic hydrocarbon impurities into compounds that have a boiling point than the desired polyfluorinated aliphatic hydrocarbon. The transformed impurities are then separated from the polyfluorinated aliphatic hydrocarbon.

REFERENCES:
patent: 4766261 (1988-08-01), Bierl
patent: 5475169 (1995-12-01), Hopp et al.

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