Method for purifying dichloropentafluoropropanes

Details Method for purifying dichloropentafluoropropanes Method for purifying dichloropentafluoropropanes

1991-10-25

1995-07-04

Siegel, Alan

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

Organic compounds

Halogen containing

570177, C07C 1738

Patent

active

054302064

ABSTRACT:
A method of recovering pure dichloropentafluoropropane from a mixture of dichloropentaflouropropane and chloroform (including breaking the azeotropic mixture thereof) involving selectively fluorinating the chloroform to the lower boiling dichloromonofluoromethane and then distilling to separate and recover pure dichloropentafluoropropane.

REFERENCES:
patent: 2450414 (1948-10-01), Benning
patent: 2462402 (1949-02-01), Joyce
Coffman et al., J. Amer. Chem. Soc., vol. 71, pp. 979-990 (1949) "Synthesis of Chlorofluoropropanes".
Siegel et al., J. Org. Chem., 53 pp. 2629-2630 (1988) "Dichlorofluoromethane-d: A Versatile Solvent for VT-NMR Experiments".
Boothe et al., Ind. and Eng. Chem. vol. 24 pp. 637-641 (Jun. 1932) "Fluorine Derivatives of Chloroform".

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