Collect. Czech. Chem. Commun. 1989, 54, 2919-2932

Permeation and sorption methods for the determination of transport parameters of gases and vapours through flat membranes

Jiří Hodek, Milan Šípek and Oskar Šlechta

Department of Physical Chemistry, Prague Institute of Chemical Technology, 166 28 Prague 6


New relations were derived for the determination of diffusion coefficients, coefficients of permeability, and sorption coefficients of gases and vapours through flat membranes by means of the permeation and sorption methods. To verify these relations, a polyurethane filled with silicium oxide (Silica) was chosen as a model system. Transport parameters of water vapours at the temperature of 25 °C were determined of this system by the sorption and permeation methods. Both the methods yield practically the same transport parameters especially after evacuating the membrane before the measurement by the permeation technique.