| 摘要 |
Hydrogen sulfide is removed from a mixture of gases including carbon dioxide by passing the mixture over an immobilized liquid membrane in intimate contact with a hydrophobic, microporous gas, permeable barrier and absorbing in a liquid solution hydrogen sulfide passing through the membrane. In a sweep of hot carbonate solution, a nearly stagnant boundary layer adjacent the gas permeable barrier absorbs acid gases by reaction and diffusion, maintaining low hydrogen sulfide partial pressure at the outlet side of the barrier. Alternatively, the sweep may comprise an aqueous solution containing a redox agent which converts absorbed hydrogen sulfide into sulfur, or an ethanol amine solution. The apparatus exhibits low permeability to carbon dioxide and high permeability to hydrogen sulfide.
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