Process for the manufacture of halogenated hydrocarbons

Details Process for the manufacture of halogenated hydrocarbons Process for the manufacture of halogenated hydrocarbons

1980-05-15

1981-08-25

Sever, Frank

Distillation: processes, separatory

With disparate physical separation

Utilizing removing solid from liquid

203 79, 203 80, 203 85, 203 91, 203 95, 570135, B01D 310

Patent

active

042857783

ABSTRACT:
2,2-Dichloro-5-methyl-1,1,1-trifluorohex-4-ene, an intermediate in the synthesis of pyrethroid insecticides, is obtained by continuous distillation, preferably under sub-atmospheric pressure, of a mixture of 5-methyl-2,2,4-trichloro-1,1,1-trifluorohexane, dimethylformamide and lithium bromide, precipitating the chlorofluorocarbons from the distillate with water and separating the desired product from starting material by a further distillation.

REFERENCES:
patent: 2996527 (1961-08-01), Krespan
patent: 3067264 (1962-12-01), Paciorek et al.
patent: 3317618 (1967-05-01), Hazeldine
patent: 3925491 (1975-12-01), Riess et al.
patent: 4210611 (1980-07-01), Crosby et al.

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