Abstract
Permeation rates of hydrogen, helium, methane, nitrogen, carbon monoxide, oxygen, argon, carbon dioxide and propane through asymmetric cellulose acetate membranes were measured in the temperature range from 273 to 373 K. Membranes constants of the transport model equation consisting of solution-diffusion flow through the polymer matrix and Knudsen flow through the micropores were determined by permeabilities of zero pressure limit of helium and nitrogen. The permeabilities of other gases can be predicted well by the model equation with these constants. The variety of data which depends on the membrane structures and the measuring temperatures has been explained reasonably by the transport model.
