Freeze-wash method for separating carbon dioxide and ethane

Details Freeze-wash method for separating carbon dioxide and ethane Freeze-wash method for separating carbon dioxide and ethane

1979-12-31

1981-01-20

Yudkoff, Norman

Refrigeration

Processes

Circulating external gas

62532, 62 28, F25J 302

Patent

active

042460158

ABSTRACT:
A method is disclosed for separating a mixture of carbon dioxide and ethane derived from a prior separation stage. The separation is accomplished by freezing the carbon dioxide in an azeotrope of carbon dioxide and ethane and washing the ethane from the solid carbon dioxide with a liquid hydrocarbon having at least three carbon atoms. The freezing stage may be preceded by distillation of a carbon dioxide-ethane mixture to form the azeotrope. The carbon dioxide and wash hydrocarbon may be separated in a subsequent distillation stage. In addition, if desired, the ethane-wash hydrocarbon mixture may be similarly 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: 3130026 (1964-04-01), Becker
patent: 3224208 (1965-12-01), Schlumberger et al.
patent: 3236057 (1966-02-01), Hashemi-Tafreshi
patent: 3376709 (1968-04-01), Dickey et al.
patent: 3798918 (1974-03-01), Maher et al.

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