Continuous process for the gaseous-phase preparation of trichlor

Details Continuous process for the gaseous-phase preparation of trichlor Continuous process for the gaseous-phase preparation of trichlor

1981-11-25

1986-08-12

Warren, Charles F.

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

Organic compounds

Halogen containing

570163, 570165, 570166, 570167, 570168, 570169, C07C 1700

Patent

active

046057986

ABSTRACT:
This invention relates to a continuous gaseous-phase process for the preparation of trichlorotrifluoroethane, dichlorotetrafluoroethane and monochloropentafluoroethane, in predetermined proportions, from tetrachloroethylene, chlorine and hydrofluoric acid in the presence of a catalyst. The process is characterized by the combination of two chlorination-fluorination reactors in sequence, a parallel fluorination-dismutation reactor, and a separation unit for extracting the desired products and recycling recovered hydrofluoric acid and non-fluorinated or insufficiently fluorinated products. The process advantageously yields dichlorotetrafluoroethane containing less than 7% asymmetric isomer, and trichlorotrifluoroethane containing less than 2% asymmetric isomer.

REFERENCES:
patent: 2478362 (1949-08-01), Benning
patent: 3157707 (1964-11-01), Clark et al.
patent: 3455840 (1969-07-01), Kato et al.
patent: 3632834 (1972-01-01), Christoph
patent: 3793229 (1974-02-01), Groppelli et al.
L. Marangoni, et al., "Preparation of Chloropentafluoroethane from Dichoro Tetrafluoro Ethane," J. Fluor, Chem., 19, pp. 21-34 (1981/82).

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