Method of separating chlorinated aliphatic hydrocarbons with 1 t

Details Method of separating chlorinated aliphatic hydrocarbons with 1 t Method of separating chlorinated aliphatic hydrocarbons with 1 t

1976-06-17

1977-07-19

Bascomb, Jr., Wilbur L.

Distillation: processes, separatory

Adding material to distilland except water or steam per se

Organic compound

203 58, 203 60, 203 62, 203 63, 260652P, 260654S, 203 73, 203 78, B01D 340, C07C 1738

Patent

active

040367037

ABSTRACT:
A method of partially or totally separating chlorinated aliphatic C.sub.1 to C.sub.3 hydrocarbons from mixtures of at least two of the chlorinated hydrocarbons by extractive distillation.
The mixture of the chlorinated hydrocarbons is distilled in the presence of one or more third organic compounds having a boiling point higher than that of the substances to be separated, selected from the group comprising methyl, ethyl, normal propyl and isopropyl mono and di-chloroacetates; benzyl alcohol; salicylaldehyde, benzaldehyde, n-heptanal, methylisobutylketone, tetramethylurea, .gamma.-butyrolactone; normal propyl, isopropyl, normal, secondary and tertiary butyl acetylacetates; diethyl oxalate, dimethyl succinate and preferably methyl and ethyl acetylacetates; acetic anhydride, N-formyl-morpholine, 2-chloro ethanol, hexamethylphosphotriamide, dimethyl sulphate and normal tributyl and triisobutyl phosphates.
This method is particularly applicable to separation of mixtures of 1,1,1-trichloro ethane and 1,2-dichloro ethane; trichloroethylene and 1,2-dichloro ethane; perchloroethylene and 1,1,2-trichloro ethane; and carbon tetrachloride and 1,2-dichloro ethane.

REFERENCES:
patent: 3113079 (1963-12-01), Bergeron et al.
patent: 3658657 (1972-04-01), Bursack et al.
patent: 3658658 (1972-04-01), Bursack et al.
patent: 3869353 (1975-04-01), Schubert

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