Binary permeation through a silicalite-1 membrane

Permeation of binary gaseous mixtures through a silicalite-l membrane was s tudied. Results are reported for the fluxes and separation factors as a fun ction of the feed composition, the pressure and the temperature. For the va rious cases a comparison is made between the binary and the single-componen t permeation behavior. For the permeation of the mixtures the stronger adso rbed component is little affected by the presence of the weaker adsorbed co mponent. On the other hand for the weaker adsorbed component a clear reduct ion in the flux is observed. As a consequence, the separation factor for mi xtures differs considerably from the so-called ideal separation factor, whi ch is the ratio of the one-component permeances. As expected, the separatio n factor depends on the temperature. The separation factor is also a functi on of the composition and the feed pressure. This means that the binary equ ilibrium adsorption cannot be described with the extended Langmuir model. B inary permeation and separation behavior is described using the ideal adsor ption solution theory for equilibrium adsorption.