Abstract
Porous silica membrane was modified with phenyltriethoxysilane and was used to separate N2-CO2 and N2-CO2-H2O mixtures. The experiment of the separation for N2-CO2 mixture, the separation factor for CO2 (α CO2/N2) was 0.9 in the case of using porous silica membrane (S membrane), however, when the silica membrane modified with phenyl silane coupling reagents (SC membrane) was used, the highest separation factor for CO2 (α CO2/N2) reached 1.19. This was due to the fact that the phenyl group modified the surface of porous, and increased affinity of CO2. So, CO2 was easy to condense on the surface of porous, and N2 become difficult to permeate. For this reason, the separation factor for CO2 can be improved. Further, the experiment of SC membrane in the separation for N2-CO2-H2O mixture, the highest separation factor for CO2 (α CO2/N2) was 1.66, which is higher than that for N2-CO2 mixture.
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