Purification of telomers prepared from chlorotrifluoroethylene a

Details Purification of telomers prepared from chlorotrifluoroethylene a Purification of telomers prepared from chlorotrifluoroethylene a

1988-08-22

1989-10-10

Evans, J. E.

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

Organic compounds

Halogen containing

570172, C07C 1724, C07C 1738, C07C 1908

Patent

active

048733822

ABSTRACT:
A mixture of telomers prepared by reacting chlorotrifluoroethylene with 1,1,2-trichlorotrifluoroethane (CCl.sub.2 FCF.sub.2 Cl) is purified by reacting the telomer mixture with potassium hydroxide in the presence of a quarternery ammonium compound and, optionally, a glycol, separating and removing impurities from the telomer mixture, subsequently reacting the telomer with potassium permanganate in the presence of the quarternery ammonium compound in a solvent, and recovering a purified telomer mixture.
If additional purity is required, the purified telomer mixture can be heated to a temperature of from about 150.degree. C. to about 250.degree. C. for at least 12 hours, and impurities formed during the thermal treatment are removed.
The purified telomers of this invention find uses in applications requiring the use of non-flammable hydraulic fluids.

REFERENCES:
patent: 3388175 (1968-06-01), Viney
patent: 4102981 (1978-07-01), Woychesin et al.
patent: 4129603 (1978-12-01), Bell
patent: 4766261 (1988-08-01), Bierl

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