Two stage carbon dioxide and methane separation

Details Two stage carbon dioxide and methane separation Two stage carbon dioxide and methane separation

1981-04-21

1982-09-28

Yudkoff, Norman

Refrigeration

Processes

Circulating external gas

62 24, F25J 302

Patent

active

043516556

ABSTRACT:
A method is disclosed for standard distillation of a mixture of carbon dioxide and ethane derived from a prior separation state in a way that greater than normal separation is obtained. The greater separation is accomplished in two stages. In the first stage, an azeotrope of carbon dioxide and ethane is formed in a first distillation column at a first pressure. The azeotropic mixture is then transferred to a second distillation column operated at a second pressure. The second pressure is at least 150 psia greater or less than the first pressure and is sufficient to shift the phase curves or equilibrium ratios so that additional separation of the ethane and carbon dioxide is accomplished in the second column. Preferably, if the concentration of carbon dioxide in the original ethane-carbon dioxide mixture is less than the concentration of carbon dioxide in the azeotrope, the pressure in the second column will be lower than pressure in the first column. The reverse is preferred when the concentration of carbon dioxide in the original mixture is greater than the concentration of carbon dioxide in the azeotrope. The method is useful in carbon dioxide separation facilities where it is desirable to recover additional ethane that would otherwise be lost.

REFERENCES:
patent: 3595782 (1971-07-01), Bucklin et al.
patent: 3983711 (1976-10-01), Solomon
patent: 4012212 (1977-03-01), Kniel
patent: 4277268 (1981-07-01), Spangler, Jr.
patent: 4284423 (1981-08-01), Eakman

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