抄録
Zeolite membranes have potential to separate organic solvents. Several research groups reported separation performance of zeolite membranes. However, separation mechanism through zeolite membranes is not clear. The separation mechanism through a silicalite membrane have been investigated in this article. Pervaporation of various organic solvents and sorption measurements of binary components were performed. Separation mechanism was discussed by adsorption-diffusion model with permeance and overall diffusion coefficient in the membrane calculated using sorption measurements. Permeance ratio of ethanol/benzene or ethanol/water were 4.0 and 5.8, respectively. The silicalite membrane showed ethanol selective sorption, and the concentration of sorbed liquid was almost same as the permeate vapor. For binary components mixture, diffusion coefficient in the membrane of both components were almost the same, although diffusion coefficient of single component were fairly different. The single file diffusion should occur in the membrane, and each diffusion coefficient greatly depends on the coexistence molecules.
