Organic compounds -- part of the class 532-570 series – Organic compounds – Halogen containing
Patent
1987-07-27
1989-01-31
Evans, J. E.
Organic compounds -- part of the class 532-570 series
Organic compounds
Halogen containing
20415795, 570134, 570137, 570170, 570178, C07C 1720, C07C 1738, C07C 1908, C07G 1300
Patent
active
048017639
ABSTRACT:
A process is disclosed for purifying and stabilizing a mixture of regular chlorotrifluoroethyelne telomers of formula RCXCl(CF.sub.2 CFCl).sub.n Br from bromine-containing irregular telomer impurities of similar molecular weight. The telomer mixture is produced by reacting chlorotrifluoroethylene with a telogen of formula RCXClBr, where R is CF.sub.2 Br, or Cl, and X is Cl or F. The telomer mixture is then chlorinated using either elevated temperature alone (100.degree. C.-350.degree. C.), or a combination of elevated temperatures (100.degree. C.-200.degree. C.) and light energy primarily of the wavelength region greater than about 3000.degree.A. Under these conditions, CFClBr telomer end group of the regular or normal telomer is chlorinated to form --CFCl.sub.2 end groups, while the bromine-containing irregular telomer impurities (whose bromine-containing end groups are substantially only --CF.sub.2 Br) are substantially not chlorinated. The desired regular telomers can then be readily separated from the higher boiling impurities by distillation. Any --CF.sub.2 Br groups present in the isolated regular telomer are then further stabilized by prolonged chlorination under the above conditions or at elevated temperatures (100.degree. C.-350.degree. C.) with irradiation by a UV lamp.
REFERENCES:
patent: 2788375 (1957-04-01), Ehrenfeld
patent: 3558723 (1971-01-01), Davis et al.
patent: 3686082 (1972-08-01), Ruehlen
patent: 4731170 (1988-03-01), Caporiccio et al.
Dannels Bobby F.
Maul James J.
Tang David Y.
Evans J. E.
Gosz William G.
Occidental Chemical Corporation
Tao James F.
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