摘要
对聚二甲基硅氧烷(PDMS)/聚砜(PS)复合膜从低浓度乙醇水溶液中脱除乙醇的渗透汽化过程进行了研究。考察了操作温度、料液浓度及流速对渗透通量的影响,并对其传质过程进行分析。结果表明,乙醇渗透通量随料液温度、浓度及流速的增加而增大;利用Wilson图解法确定膜阻,并计算液相传质系数,进而获得传质准数关联式;在此传质过程中,液膜阻力占总阻力50%以上,表明液膜阻力对该渗透汽化过程有较大影响。
The effect of varying the operating conditions on the permeation flux during pervaporation of dilute aqueous solutions of ethanol through a poly（dimethylsiloxane）/polysulphone （PDMS/PS） composite membrane has been studied. It was found that the pervaporation performance was improved by increasing the operating temperature, feed concentration and flow rate. The membrane resistance was determined by means of the Wilson plot method, and the mass transfer coefficient of the liquid phase and the mass transfer correlation were obtained. The ratio of liquid boundary layer resistance to overall mass transfer resistance was higher than 50 % within the experimental range studied, indicating that the liquid film resistance has an important influence on the pervaporation.
出处
《北京化工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第3期230-233,共4页
Journal of Beijing University of Chemical Technology(Natural Science Edition)
基金
国家自然科学基金(200206003)
关键词
渗透汽化
PDMS复合膜
串联阻力模型
传质
pervaporation
PDMS composite membrane
resistance-in-series model
mass transfer
