Separating carbon dioxide and ethane by liquid-liquid extraction

Details Separating carbon dioxide and ethane by liquid-liquid extraction Separating carbon dioxide and ethane by liquid-liquid extraction

1979-12-28

1982-01-19

Yudkoff, Norman

Refrigeration

Processes

Circulating external gas

62 28, F25J 302

Patent

active

043114954

ABSTRACT:
A method is disclosed for separating a mixture of carbon dioxdie and ethane derived from a prior separation stage. The separation is accomplished by liquid-liquid extraction of a liquefied azeotrope of carbon dioxide and ethane with a liquid hydrocarbon having at least three carbon atoms, that is, propane, or a heavier hydrocarbon, or a mixture of hydrocarbons. The liquid-liquid extraction unit may be preceded by distillation of a carbon dioxide-ethane mixture to form the azeotrope. The ethane and extraction hydrocarbon may be separated in a subsequent distillation stage. The method is useful in carbon dioxide separation facilities where it is desirable to recover ethane that would otherwise be lost.

REFERENCES:
patent: 3595782 (1971-07-01), Bucklin et al.
patent: 4012212 (1977-03-01), Kniel
patent: 4035167 (1977-07-01), Starks
patent: 4185978 (1980-01-01), McGalliard

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