Xylene Permeation Transport through Composite Ba-ZSM-5/SS Tubular Membranes: Modeling the Steady-State Permeation

A.M. TARDITI; E. LOMBARDO; A. M. AVILA

INDUSTRIAL & ENGINEERING CHEMICAL RESEARCH

American Chemical Society

Lugar: Columbus, Ohio, USA; Año: 2008 vol. 47 p. 2377 - 2385

0888-5885

Steady-state single-component and ternary mixture xylene permeation fluxes through Ba-ZSM-5/SS composite membranes were studied as a function of temperature and pressure. The single p-xylene flux has a weak maximum with temperature (100 - 400°C). The flux magnitude and its maximum location depend on the extent of Ba-exchange. The o- and m-xylene fluxes steadily increase with temperature. The single permeation behavior is well described by a model based on the contribution of different transport mechanisms: Knudsen flux, surface diffusion, and activated gas translation diffusion. The comparisons between either the mixture permeation results or the pressure effect experiments and the simulated data reflect the existing adsorbate-framework interactions that are not easily contemplated by a macroscopic model.