Abstract
A high silica CHA-type membrane was synthesized by the in-situ crystallization method on a disk like α-alumina porous support to separate both acid (H2S, CO2) gases from methane. The membrane showed a permeance of 3.39×10−8mol/m2sPa for pure CO2with CO2/CH4 ideal selectivity of 21.6 at 303K and 100kPa pressure difference across the membrane. The membrane was also tested with N2 and O2 pure gases indicating a small O2/N2 selectivity of 1.2–1.4, which shows that this type of membrane is not suitable for O2/N2 separation. The membrane performance was also analyzed by binary (CO2–CH4) and ternary (H2S–CO2–CH4) gas mixtures, with compositions near the real sour natural gas (CO2: 2.13mol%, H2S: 0.3mol% and CH4:97.57mol %), at 298K and 400kPa pressure difference. The results revealed that the synthesized membrane is able to separate H2S from CH4 so that both acid gases (CO2, H2S) can be removed from CH4 simultaneously. H2S permeance was 1.70×10−8mol/m2sPa with H2S/CH4 selectivity of 3.24.
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