Abstract
New facilitated transport membranes have been synthesized and shown to selectively permeate carbon dioxide and hydrogen sulfide from methane and hydrogen. The membranes are based on the polyelectrolyte poly(vinylbenzyltrimethyl-ammonium fluoride), PVBTAF, and exhibit exceptional permselective properties. For example, at 23°C and 32 cmHg CO 2, a PVBTAF composite membrane displayed a CO 2 permeance of 6×10 −6cm 3/cm 2 s cmHg and CO 2/H 2 and CO 2/CH 4 selectivities of 87 and 1000, respectively. The CO 2/H 2 selectivity is the highest reported for any membrane. The permeance of both CO 2 and H 2S increased with decreasing feed partial pressure of the respective gases, a characteristic of facilitated transport membranes. The permselectivity is also dependent on the hydration state of the membrane and is optimal at a gas stream relative humidity in the range 0.25−0.50. The membranes show no deterioration after 30 days of continuous operation but react with trace level sulfur-containing contaminants common to cylinder H 2S.
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