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Separation of Carbon Dioxide (CO2) from Gas Mixture by Membrane Permeation Process

V. Soesilowati Praptowidodo,

Data & Software Engineering Research Group
STEI-ITB, Jl. Ganeca No.10, Bandung 40132, Indonesia


Removal CO2 from natural gas and combustion exhaust gas have been studied by employing membrane permeation process. In these studies, polysulfone, polyimide and polydimethylsiloxane membranes are used to elucidate the influence of flexibility and rigidity of polymer  as well as the influence of polar groups within polymer matrix on gas transport through membrane. The performance of the membranes as specified  by its selectivity and permeation flux are measured in terms on the diffusion and sorption coefficients as well as the permeability. It is found that the flexibility of the membrane tends to suppress its selectivity while enhancing its permeation flux. On the other hand, rigidity of the membrane together with  the polar groups is shown to induce the opposite  effects. In both case, however, the selectivity and permeation follow approximately the same qualitative variations with respect to concentration which is suspected to be caused by the plasticization effect  in the membrane. It is therefore concluded that a rigid polymer membrane with polar groups is most effective for its performance.

Keywords: membrane; polymer; polar; permeation; separation; selectivity

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