Permeation of pure gases through polyamide membranes and laminated polyamide membranes.

Abstract

Asymmetric polyamide membranes of different porosities were prepared by varying the oven evaporation times. Permeation rates of hydrogen, helium, methane, nitrogen, oxygen, and carbon dioxide, for pressures between 345 and 2068 kPa, were measured for the above membranes and for the same membranes laminated with silicone rubber. The surface force pore flow model was employed to characterize and subsequently predict the permeation rates through the polyamide membranes; whereas, the modified resistance model was employed to analyze the experimental data of the laminated membranes. Membrane performance for various substrate porosities and lamination thicknesses were simulated by the modified resistance model.