Process for the recovery of mixtures of chlorotetrafluoroethane

Details Process for the recovery of mixtures of chlorotetrafluoroethane Process for the recovery of mixtures of chlorotetrafluoroethane

1991-04-10

1992-07-14

Bascomb, Jr., Wilbur

Distillation: processes, separatory

Miscellaneous separatory

203DIG9, 203DIG19, 570178, B01D 314, C07C 1738

Patent

active

051299976

ABSTRACT:
A process for the preparation of mixtures of chlorotetrafluoroethane and octafluorocyclobutane from the gas stream from the pyrolysis of chlorodifluoromethane at temperatures above 600.degree. C. is described in which the principal constituents tetrafluoroethylene and hexafluoropropylene as well as hydrogen chloride are removed in advance. The mixtures are obtained by withdrawal as a side fraction during the rectifying distillation of the residue remaining, a clean separation of the perfluorocyclobutenes advantageously taking place. The mixtures are used for obtaining hexafluoropropylene by pyrolysis.

REFERENCES:
patent: 2406794 (1946-09-01), Benning et al.
patent: 2640017 (1953-05-01), Graff
patent: 3408264 (1968-10-01), Ward
patent: 4623432 (1986-11-01), Ali
patent: 4747914 (1988-05-01), Schwarzmaier et al.
patent: 4898645 (1990-02-01), Voight et al.
R. J. Hengstebeck: Distillation; Principles & Design Procedures, Reinhold Publ. Corp. N.Y., 1961 (pp. 119, 147 and 193).

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