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6174372 
Journal Article 
Gas separation by silicone-coated dry asymmetric aromatic polyamide membranes 
Matsuura, T; Mohammadi, AT; Sourirajan, S 
1995 
9 
3 
181-187 
A study was made on the permeation rate of pure gases including helium, hydrogen, oxygen, nitrogen, carbon dioxide and methane, and the separation of CO2/CH4 gas mixtures by a silicone-coated aromatic polyamide membrane. The ideal and actual separation factors of the polymer towards these gases were calculated. The membranes were prepared by the phase-inversion technique and coated with silicone rubber after drying. While the permeation rates of He, H2 and CO2 were not affected significantly by coating, the permeation rates of N2 and CH4 gases decreased to below the detectable limit of the flow meter. The permeation rate of O2 decreased after coating. The actual separation factor for mixtures of CO2/CH4 varied from 64 to 166, one of the highest separation factors reported in the literature. 
gas separation; composite membrane; aromatic polyamide membrane