Separation of CO.sub.2 from a gaseous mixture

Details Separation of CO.sub.2 from a gaseous mixture Separation of CO.sub.2 from a gaseous mixture

1985-06-12

1987-09-22

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 32, 62 42, F24J 302

Patent

active

046953043

ABSTRACT:
For the separation of CO.sub.2 from a gaseous mixture containing CO.sub.2 and C.sub.1 -C.sub.6 hydrocarbons, the gaseous mixture to be fractionated is separated in a first fractionating stage into an overhead fraction containing substantially all of the C.sub.1 and C.sub.2 hydrocarbons as well as CO.sub.2 in a molar ratio CO.sub.2 /C.sub.2 of 2:1 to 3.5:1, and into a bottoms fraction containing the remainder of CO.sub.2 and the C.sub.3+ hydrocarbons. The fraction containing CO.sub.2 /C.sub.3+ hydrocarbons is further fractionated, preferably in two serially connected rectification columns, into CO.sub.2 and C.sub.3+ hydrocarbon fractions.

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