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采用浸渍法和表面改性多步组装合成技术在商业用多孔氧化铝管上制备介孔二氧化硅担载膜。所制备的介孔二氧化硅膜层的厚度平均为2μm,平均孔径为1.59nm。单一气体的渗透实验表明:气体通过介孔二氧化硅膜层符合Knudsen扩散模型,在298K和100kPa的恒定条件下,氦气和氮气的渗透量分别为15.6×10-6mol/(s·m2·Pa)和2.5×10-6mol/(s·m2·Pa)。渗透蒸发实验表明:经六甲基二硅氮烷表面改性的二氧化硅膜层在303K和313K下分别对含3%(质量分数,下同)和5%乙醇的水溶液进行乙醇组分的提浓,乙醇的分离系数和渗透通量分别为15.2～18.7和1.09～1.25kg/(m2·h)。
Mesoporous silica supported membranes were prepared on commercial porous alumina tubes by impregnation method and surface modification multi-step assembly synthesis technique. The prepared mesoporous silica film had an average thickness of 2 μm and an average pore diameter of 1.59 nm. The experiments of single gas permeation show that the gas passes through the Knudsen diffusion model through the mesoporous silica film and the permeation amounts of helium and nitrogen are respectively 15.6 × 10-6mol / (s · m2 · s) at 298K and 100kPa Pa) and 2.5 × 10 -6 mol / (s · m 2 · Pa). Pervaporation experiments showed that the aqueous solution of 3% (mass fraction, the same below) and 5% ethanol were subjected to ethanol solution at 303K and 313K respectively by hexamethyldisilazane surface modification silica membrane Concentration, ethanol separation factor and permeate flux were 15.2 ~ 18.7 and 1.09 ~ 1.25kg / (m2 · h).