B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 53/22 (2006.01) C01B 3/50 (2006.01) C01B 23/00 (2006.01)
Patent
CA 2277669
An object of the present invention is to provide a method for recovering a gas using a semipermeable membrane in an apparatus having a simple structure. The method is capable of maintaining a purity of a product gas at a constant value even if a feed amount of a feed stream is fluctuated. A feed stream G1 is a gas mixture of a fast gas having a relatively high permeability to a membrane 1 and a slow gas having a relatively low permeability to the membrane 1. The feed stream G1 is pressurized by a compressor 3 and fed to a membrane 1 separation unit 2 having the membrane 1. Part G7 of the permeate stream on the permeate side of the membrane 1 is recirculated to the upstream side of the compressor 3 through the first recirculation line 17 and merged into a stream of the feed stream G1. Simultaneously, another part of the permeate stream G2 on the permeate side of the membrane 1 is recovered through a product gas recovering line 5. In this manner, a product gas G3 having a fast gas increased in concentration is obtained.
Yamamoto Takao
Yamashita Naohiko
L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Proced Es Geo
Robic
LandOfFree
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