B-oriented MFI zeolite membranes for xylene isomer separation - Effect of xylene activity on separation performance

MFI zeolite membranes, especially b-oriented ones, show superb vapor permeation/separation performance for xylene isomer separation at low pressures. In industrial applications these membranes should be operated high pressures in the mode or with liquid feed pervaporation mode. This paper reports influence of activity on and membranes. High quality were synthesized an organic template modified silica substrates. For permeation binary p/o-xylene feed, both permeance (for p-xylene o-xylene) p-/o-xylene factor increase, reaching maximum 515 150oC, then decreases increasing temperature due to combined effects dependence diffusivity adsorption. The xylenes decrease monotonically (or pressure). Lowest is observed when giving about 2. Compared randomly oriented template, better less negative effect factor. However, b- exhibit a similarly poor