Selective permeation of carbon dioxide through synthetic polymer membranes having pyridine moiety as a fixed carrier

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Abstract
Sorption and permeation of CO2 were investigated by using synthetic polymer membranes having pyridine moiety or pyridine–Cu(II) complex group as a fixed carrier. The solubility data for CO2 were interpreted by the dual sorption model, Henry's law plus Langmuir‐type adsorption. The permeation results of CO2 through the present membranes containing pyridine moiety were analyzed in terms of the partial immobilization model, while the solubilities and permeablities of O2 and N2 obeyed Henry's law. Permselectivity of the present membrane for CO2 was achieved. These results were explained by the acid‐base interaction between CO2 molecules and fixed carrier in the present membrane.