B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
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B01D 53/04 (2006.01) B01D 53/047 (2006.01) B01D 53/22 (2006.01) C01B 3/50 (2006.01) C01B 3/56 (2006.01)
Patent
CA 1201661
- 24 - ENHANCED HYDROGEN RECOVERY FROM LOW PURITY GAS STREAMS Abstract of the Disclosure A high pressure gas stream having a hydrogen content of up to about 90 mol percent is passed to a separator containing a permeable membrane capable of selectively permeating hydrogen. The separator is used to achieve a bulk separation of the desired hydrogen from impurities contained in the gas stream. The separated hydrogen is recovered at a reduced pressure and is passed to a pressure swing adsorption system adapted for operation at said reduced pressure. The off-gas from the separator is recovered essentially at the higher pressure of the gas stream. A portion of the off-gas is throttled to a lower pressure, with appropriate power recovery, and is passed to the pressure swing adsorption system as a co-feed gas, thereby contributing to the recovery of purified hydrogen product and to a reduction in the operating costs for the desired hydrogen separation and purification. The remaining off-gas is recovered as a relatively high pressure fuel or feed gas for other purposes.
425472
Hopley William G.
Union Carbide Corporation
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