Abstract
ABSTRACT Helium is a non-renewable resource that is obtained from natural gas. The recent increase in the wholesale price of He has focused attention on exploiting low grade reservoirs. Cryogenic liquefaction for He recovery becomes increasing energy intensive as the feed He concentration decreases. Hence, alternative separation technologies are required and membrane gas separation has potential. Here, membranes are simulated for the recovery of He for a range of feed gas compositions. A cellulose acetate membrane is the focus, with simulations indicating that for a feed with less than 3 mol% He, a three-membrane stage cascade process is viable. The energy duty of the process increased with reduced He concentration, but this increase in energy duty is less than that observed for cryogenic liquefaction and below a feed concentration of 2.5 mol% He, the membrane process is energy competitive. Hence, membrane gas separation has potential for He recovery from natural gas.
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