Recovery of carbon dioxide from gas mixture

Details Recovery of carbon dioxide from gas mixture Recovery of carbon dioxide from gas mixture

1985-07-15

1987-01-27

Spitzer, Robert

Gas separation

Means within gas stream for conducting concentrate to collector

55 68, 203 39, 203 41, B01D 5322

Patent

active

046392572

ABSTRACT:
Carbon dioxide is recovered from gas mixtures containing it in a concentration not greater than the equilibrium concentration at the freezing temperature of the mixture, by subjecting the gas mixture to membrane separation and recovering from the membrane separation a permeate having a carbon dioxide concentration between the equilibrium concentration and 98% (by volume), distilling said permeate at subambient temperature above the freezing temperature of the permeate and recovering substantially pure carbon dioxide as a liquid bottoms product of the distillation. Carbon dioxide is recovered from gas mixtures containing it in a high concentration by supplying the gas mixture at superatmospheric pressure and distilling said gas mixture at sub-ambient temperature in a distillation column, recovering substantially pure carbon dioxide as a liquid bottoms product of the distillation, warming the overhead stream from the distillation to a temperature suitable for membrane separation, passing the overhead stream at superatmospheric pressure over a membrane which is selectively permeable for carbon dioxide and thereafter recycling carbon dioxide-rich permeate for recompression and feeding to the distillation column.

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patent: 4386944 (1983-06-01), Kimura
patent: 4466946 (1984-08-01), Goddin, Jr. et al.

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