(317f) Transient Permeation of Binary and Ternary Gas Mixtures on Mtes Templating Silica/á-Alumina Composite Membrane

In case of molecular sieving materials, such as Zeolite or CMS membranes, transport/separation models have been well developed by many researchers. But in case of organic templating silica membranes, in spite of the importance of transport mechanisms, especially multi-component transport mechanism remains very limited. The equilibirum and kinetic characteristics of a MTES (methyltriethoxysilane) templating silica/á-alumina composite membrane were studied using unsteady and steady-state permeation of pure CO2, N2, CH4, H2 and He gases. The saturated amount of adsorption, Langmuir parameter, and diffusivity could be estimated by the generalized Maxwell-Stefan model, the incorporating dust gas model, and the Langmuir model using transient and steady-state measurements. In this study, the experimental and theoretical studies were extended to multicomponent (binary and ternary; CO2:H2=1:1, CO2:CH4:H2=1:1:1 etc.) gas mixture separation from single gas permeation. Since the permeation flux in the MTES membrane was affected by molecular sieving effects as well as surface diffusion properties, the kinetic and equilibrium separation should be considered simultaneously in the membrane according to molecular properties. All mathematical simulations and parameter estimations were performed by gPROMS dynamic simulator.