摘要
对自制聚二甲基硅氧烷(PDMS)膜渗透汽化分离低浓度吡啶-水体系的性能进行了研究。采用扫描电镜(SEM)和X射线能谱仪(EDS)对膜的形貌及化学组成进行了分析和表征,测定了PDMS膜在吡啶-水溶液中的溶胀行为。分别考察了膜厚度、操作温度、下游侧压强、进料浓度以及超声对PDMS膜渗透蒸发分离性能影响。结果表明,随着操作温度和原料中吡啶浓度的增加,膜的渗透通量增加,分离因子减小;随着膜厚度的增加,膜的渗透通量减小,分离因子增加。下游侧压强增加时,膜的渗透通量和分离因子都先升后降。在操作温度318 K、下游侧压强55 mmHg的条件下,采用膜厚为150·m的PDMS膜对2%(wt)的吡啶-水体系进行渗透汽化分离,其渗透通量和分离因子分别达到108 g·m·2·h-1和75.2。有超声波作用时,该膜的渗透通量最大提高13.1%,分离因子最大提高3.6%。
The pervaporation separation of pyridine from dilute aqueous solution using polydimethylsiloxane（PDMS） membrane was investigated.The PDMS membranes were characterized with SEM and EDS,and the swelling degree of PDMS membranes in pyridine-water mixture was determined.The effects of membrane thickness,operation temperature,the downstream side pressure and feed concentration on the separation performance of PDMS membrane during pervaporation process were evaluated.Furthermore,the effects of ultrasound irradiation on membrane separation performance were studied.The results indicate that the increase of the feed concentration and operation temperature is in favor of the permeation flux but the separation factor decreases;while the separation factor increases and the permeation flux decreases with the increase of membrane thickness;permeation flux and separation factor increase and then decrease with the increase of downstream pressure.The PDMS membrane with the membrane thickness of 0.15 mm shows the permeation flux of 108 g·m·2·h-1 and the separation factor of 75.2 under following conditions： pyridine solution 2%（wt）,operation temperature 318 K,downstream pressure 55 mmHg.The ultrasonic enhancement ratio of flux and separation factor could reach 13.1% and 3.6%.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2011年第6期934-940,共7页
Journal of Chemical Engineering of Chinese Universities
基金
江苏省六大人才高峰资助项目(2008028)
国家高技术研究发展计划(863计划
2009AA03Z222
2009AA05Z437)
江苏省普通高校研究生科研创新计划(CX07B_142z)
关键词
渗透汽化
聚二甲基硅氧烷膜
超声波
吡啶-水
pervaporation
polydimethylsiloxane membrane
ultrasound wave
pyridine-water
