Hybrid prepurifier for cryogenic air separation plants

Details Hybrid prepurifier for cryogenic air separation plants Hybrid prepurifier for cryogenic air separation plants

F - Mech Eng,Light,Heat,Weapons

25

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F25J 3/04 (2006.01) B01D 53/22 (2006.01)

Patent

CA 2044727

- 33 - HYBRID PREPURIFIER FOR CRYOGENIC AIR SEPARATION PLANTS Abstract of the Disclosure Feed air to a prepurifier adsorption system/cryogenic air separation system for dry, high purity nitrogen and/or oxygen production is dried in a membrane dryer preferably characterized by a countercurrent flow path. Drying is enhanced by the use of purge gas on the permeate side of the membrane dryer, with adsorption system or cryogenic air separation system product or waste gas, dried feed air or ambient air being used as purge gas. Two membrane materials are employed in the membrane dryer, in a single stage or in two stages, for enhanced removal of water and carbon dioxide from the feed air. D-16,348

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