Microporous membranes approx. 0.l mm in thickness were prepared by controlled carbonization of phenol formaldehyde sheet. The effects of carbonization temperature on sorption capacity, volume of micropores, size of micropores and transport properties were studied. Sorption of CO2 at room temperature was evaluated on the basis of Dubinin-Raduskewich's isotherm. The diffusion coefficients and permeability for CO2 were established from the time course of pressure drop during sorption. Microporous membranes on a macroporous carrier were also designed.
