关键词: 渗透汽化, 苯, 改性蒙脱石, 粘土, 聚二甲基硅氧烷

Abstract: 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.

Key words: pervaporation, benzene, organo-modified montmorillonite, clay, polydimethylsiloxane