摘要
采用甲基三乙氧基硅烷代替四乙氧基硅烷作为交联剂制备了高甲基 /Si摩尔比的致密聚二甲基硅氧烷 (PDMS)平板膜并用于分离苯 /水体系。未溶胀状态下膜厚为 140 μm。X射线衍射 (XRD)表明膜的结晶度为 18 72 %。水、苯在膜面的接触角分别为 113 5°和 2 0° ,改性膜疏水性增大。以渗透通量和分离因子为评价指标 ,研究了原料液温度、流动状况、浓度、膜下游侧压力对渗透蒸发分离性能的影响。结果表明 ,随着原料液温度、流速以及料液浓度的提高 ,通量和分离因子都呈增加趋势。随着下游侧压力的升高 ,分离因子升高而通量降低。
Prepolymer of methyl-triethoxysilicane is used as the crosslinker instead of tetraethyl orthosilane in this paper to prepare the dense polydimethylsiloxane(PDMS) membrane with higher methyl/Si molar ratio for the benzene/water mixture separation. The thickness of unswelling PDMS membrane is 140 μm. XRD shows crystalline content of the membrane is 18.72%. The contact angles of water and benzene on the membrane surface are 113.5°and 20°, respectively. The modified membrane is high hydrophobic. The effects of feed temperature, flow rate, feed concentration and the downstream side pressure on the separation performance of membrane during pervaporation process are evaluated. Experimental results indicate that the increase of the feed concentration, flow rate and feed temperature is in favor of the permeation flux and separation factor, the later increases and the permeation flux decreases with the increase of downstream pressure.
出处
《应用化学》
CAS
CSCD
北大核心
2003年第10期932-935,共4页
Chinese Journal of Applied Chemistry
基金
教育部科学技术研究重点项目
高等学校骨干教师资助计划资助
中石化基金 (X5 0 0 0 0 3)
天津市自然科学基金重点项目资助(99380 2 0 11)
