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Hydrogen (H2) is selectively separated from carbon monoxide (CO) by permeation through a polymeric hollow fiber membrane. The driving force is the partial pressure difference across the membrane for H2 and CO. H2 is the “fast” gas, whereas CO and carbon dioxide (CO2) are the “slow” gases. The pressurized feed gas enters the bundle from the shell side; the syngas stays under pressure while the H2 is collected at a lower pressure from the fiber bore.
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