蒙脱石填充改性PDMS膜对稀溶液中苯的渗透分离性能

研究了CTAB柱撑改性蒙脱石填充聚二甲基硅氧烷(PDMS)膜对稀溶液中苯的渗透分离性能，考察了操作温度、有机蒙脱石填充量及料液中苯浓度对填充膜分离性能的影响. 结果表明，蒙脱石的填充不但能增强膜的机械性能，而且能明显改善膜的分离性能，随着蒙脱石填充量的增加，渗透通量增大，而分离因子先增大后减小；随着操作温度的提高，渗透通量明显增大，分离因子却减小；当料液中苯浓度增大时，苯通量增大，水通量保持不变，而分离因子减小. 用填充量为9.09%的填充膜对苯浓度为1000 kg/kg的料液进行渗透汽化实验，得到膜的渗透通量为115 g/(m2×h)，分离因子达到798，比纯PDMS膜通量增大了12%，分离因子增大了32%.

Pervaporation Removal of Benzene from Aqueous Solution through Montmorillonite-filled Polydimethysiloxane Membrane

The preferential permeation of benzene over water was investigated with organo-modified montmorillonite-filled polydimethylsiloxane (PDMS) pervaporation membrane. The membrane was characterized by SEM and mechanical strength measurement. The results showed that incorporation of organo-montmorillonite enhanced the mechanical stress of membrane and improved its pervaporation properties. With the organo-montmorillonite content increasing, permeation flux increased, but the separation factor increased first and then decreased, reached to the maximum value when the organo-montmorillonite content was 9.09%. With operation temperature increasing, permeation flux increased, but separation factor decreased. With benzene concentration in feed solution increasing, permeation flux of benzene increased, while the water flux was kept unchanged, and the separation factor decreased. When the filler content was 9.09%, benzene concentration in feed solution was 1000 kg/kg, the permeation flux reached to 115 g/(m2-h), and the separation factor reached to 798, increased 12% and 32% respectively, compared with pure PDMS membrane.