Liquid carbon dioxide recovery from gas mixtures with methane

Details Liquid carbon dioxide recovery from gas mixtures with methane Liquid carbon dioxide recovery from gas mixtures with methane

1986-07-31

1987-11-03

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

55 68, 62 24, 62 28, 62 32, 62 42, F25J 300

Patent

active

047041463

ABSTRACT:
Land-fill and other gases containing principally methane and carbon dioxide have been separated into high BTU fuel gas and discard carbon dioxide containing appreciable methane. Such discard gas can now be simply fractionated into high-purity liquid carbon dioxide with recoveries in excess of 80% while using a single refrigerant at a single low temperature to satisfy all refrigeration requirements of fractionation. This novel fractionation is ideally combined with the process of separating land-fill gas into high BTU fuel gas because then the methane and carbon dioxide are recovered completely as two valuable products, high BTU fuel gas and pure liquid carbon dioxide.

REFERENCES:
patent: 3130026 (1964-04-01), Becker
patent: 3453835 (1969-07-01), Hochgesand
patent: 3516261 (1970-06-01), Hoffman
patent: 3640052 (1972-02-01), Konoki et al.
patent: 3977203 (1976-08-01), Hinton et al.
patent: 4252548 (1981-02-01), Markbreiter et al.

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