膜科学与技术

PDMS中空纤维复合膜渗透汽化分离丙酮－水溶液

作者：李冰冰¹，² 王亮¹ 孙德¹ 许振良²

单位： 1长春工业大学化学工程学院，吉林长春 130012；

关键词：渗透汽化；PDMS；中空纤维膜；丙酮－水

出版年,卷(期):页码： 2011,31(5):18-24

摘要：

采用干湿相转化法纺制了聚砜(PSF)中空纤维超滤底膜，并采用溶液浸渍法制备了PDMS/PSF中空纤维复合膜。研究了PDMS膜的溶胀性能和PDMS/PSF膜渗透汽化性能，考察了PDMS/PSF膜的稳定性以及料液温度、料液丙酮浓度和渗透物侧压力等因素对膜渗透汽化性能的影响。结果表明，PDMS膜对丙酮有很强的吸附能力而对水的吸附能力则相对较弱，渗透液中丙酮浓度大于膜吸附液中丙酮浓度更远远大于浸泡液中丙酮浓度，连续操作72小时膜的渗透汽化性能保持稳定，渗透通量随料液温度以及料液浓度的升高而增加，分离系数随料液浓度的增加而降低，基本不受温度的影响。当丙酮浓度为5wt.%、料液温度为60℃时，渗透通量为632 g/(m2•h)，分离系数为35.8，乙醇和水的表观活化能分别为45.7和49 KJ/mol。

Polysulfone (PSF) ultrafiltration hollow fiber base membranes were fabricated by the dry/wet-spinning method. PDMS/PSF hollow fiber composite membranes were prepared by coating PDMS solution on the outer surface of the PSF ultrafiltration membranes using the dip-coated method. PDMS swelling behaviors and pervaporation performances of PDMS/PSF membranes were studied. PDMS/PSF membranes were used to separate dilute acetone aqueous by pervaporation. Membrane stability and the effects of feed temperature, feed concentration and permeate pressure on membrane performance were studied. Working for 72 hours continuously, the pervaporation performance of PDMS/PSF membrane kept stable. Swelling experiments showed that PDMS membrane has a strong adsorption capacity toward acetone and a weak absorption capacity to water; acetone concentration in permeate is greater than acetone concentration in the swelled membranes and is largely greater than acetone concentration in soaking solution. Permeate flux increased with the increases of feed temperature and feed concentration. Separation factor decreased with the increasing of feed concentration and is independent of feed temperature. When acetone concentration is 5wt.%, permeation flux is 632 g/(m2? h) and separation factor is 37. The apparent activation energy of ethanol and water were 45.7 and 49 KJ / mol.

李冰冰（1966-），女，博士，讲师，主要从事膜分离的研究,Email:lbb2006@hotmail.com

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