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A multi-layer mesoporous silicalite-1 membrane supported on commercially available porous alumina tubes was prepared by firstly dip-coating the tubes in silica colloid sol and then using a hydrothermal synthetic process.The mesoporous silicalite-1 membrane was further modified by grafting organosilane compounds with various alkyl chains length(C_nH_(2n+1)(CH_3)_2SiCl;n = 1,3,8,12 and 18).These hydrophobic silicalite-1 membranes containing silane coupling agents effectively removed ethanol from 3 wt.%,5 wt.%and 10 wt.%aqueous ethanol solutions by pervaporation over a temperature range of 303-323 K.The separation factor(a) of ethanol decreased as the ethanol content in the feed solution increased from 3%to 10%whereas the permeation flux(J) basically remained constant.Ethanol separation factors(a) of 7.90-22.24 with total fluxes(J) of 0.76-2.89 kg/(m~2h) were obtained by pervaporation at 3_3-323 K for ethanol feed composition of 3%-10%.
A multi-layer mesoporous silicalite-1 membrane supported on commercially available porous alumina tubes was prepared by dip-coating the tubes in silica colloid and then using a hydrothermal synthetic process. The mesoporous silicalite-1 membrane was further modified by grafting organosilane compounds with various alkyl chains length (C_nH_ (2n + 1) (CH_3) _2SiCl; n = 1, 3, 8, 12 and 18). The hydrophobic silicalite- 1 membranes containing silane coupling agents efficiently removed ethanol from 3 wt. wt.% and 10 wt.% aqueous ethanol solutions by pervaporation over a temperature range of 303-323 K. The separation factor (a) of ethanol decreased as the ethanol content in the feed solution increased from 3% to 10% of the permeation (a) of 7.90-22.24 with total fluxes (J) of 0.76-2.89 kg / (m ~ 2h) were obtained by pervaporation at 3_3-323 K for ethanol feed composition of 3 % -10%.