Distillation: processes – separatory – Adding material to distilland except water or steam per se – Organic compound
Patent
1976-10-20
1978-10-24
Yudkoff, Norman
Distillation: processes, separatory
Adding material to distilland except water or steam per se
Organic compound
203 60, 203 62, 203 64, 203 57, 260654S, 260652P, B01D 334
Patent
active
041219783
ABSTRACT:
A method for the partial or total separation by extractive distillation of C.sub.1 to C.sub.3 clorinated aliphatic hydrocarbons from mixtures of at least two such chlorinated hydrocarbons. The mixture of the chlorinated hydrocarbons is distilled in the presence of one or more other organic compounds having a boiling temperature higher than the substances to be separated, and selected from the group comprising saturated polyols, ethylene carbonate, propylene carbonate, dimethyl formamide, furfural, N-methylpyrrolidone, cyclohexanone, dimethylsulfoxide and, preferably, sulfolane and alkylsulfolanes in which the alkyl group is C.sub.1 or C.sub.2 ; use of this method for the separation of mixtures containing or essentially consisting of trichlorethylene and 1,2-dichloroethane.
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patent: 2858347 (1958-10-01), Hutchings
patent: 3113079 (1963-12-01), Bergeron et al.
patent: 3427357 (1969-02-01), Gramont et al.
patent: 3689373 (1972-09-01), Hutchinson
patent: 3809724 (1974-05-01), Golden
Rhone-Progil
Yudkoff Norman
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