Separation of gaseous mixtures

Details Separation of gaseous mixtures Separation of gaseous mixtures

1986-12-22

1988-07-26

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 32, 62 36, 62 42, F25J 302

Patent

active

047597860

ABSTRACT:
An incoming stream of gas mixture typically comprising methane and up to 12% by volume of carbon dioxide is subjected to rectification in a first column to form a carbon dioxide depleted fraction that is withdrawn as product from the top of the column and a carbon dioxide-enriched fraction which is withdrawn from the bottom of the column is warmed in a heat exchanger and is introduced into a second rectification column operating at a higher pressure than the first column. A stream in which carbon dioxide predominates is withdrawn from the bottom of the higher pressure column while a stream 34 containing a lower proportion of carbon dioxide than said enriched fraction is withdrawn from the top of the higher pressure column is throttled through a valve and is united with the incoming stream of gas mixture upstream of or in the lower pressure column.

REFERENCES:
patent: 2768118 (1956-10-01), Laurence et al.
patent: 2888807 (1959-06-01), Bocquet
patent: 3313724 (1967-04-01), Kniel
patent: 3518165 (1970-06-01), Ward
patent: 4318723 (1982-03-01), Holmes et al.
Natural Gas Processing and Utilization Conference--"Cryogenic Removal of Carbon Dioxide from Natural Gas"--G. C. Schianni pp. 1-50-1-55.

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