Department of Chemical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Hafez Ave., P.O. Box 15875-4413, Tehran, Iran.
Water Sci Technol. 2011;63(12):2820-6. doi: 10.2166/wst.2011.612.
This study describes the successful separation of acrylonitrile (ACN) from dilute aqueous streams using pervaporation process. The influences of ACN feed concentration, permeate pressure, operating temperature, feed flow rate and membrane thickness on the membrane separation performance were investigated. The results showed that with an increase in ACN concentration in the feed solution, the permeation flux of ACN increased while the enrichment factor decreased. It was also indicated that increasing the permeate pressure reduced the driving force for mass transfer and consequently the permeation flux dropped while the enrichment factor enhanced. Polydimethylsiloxane membranes used in this study showed very good properties in the separation process, leading to enrichment factors in the range of 70-140. Furthermore, the activation energy for pervaporation of both ACN and water calculated from Arrhenius plot indicated that the permeation of water through the membrane was more temperature dependant than ACN.
本研究描述了使用渗透蒸发过程从稀水溶液中成功分离丙烯腈（ACN）的过程。考察了进料浓度、渗透侧压力、操作温度、进料流量和膜厚度对膜分离性能的影响。结果表明，随着进料溶液中 ACN 浓度的增加，ACN 的渗透通量增加，而浓缩因子降低。结果还表明，提高渗透侧压力会降低传质驱动力，从而导致渗透通量下降，而浓缩因子增加。本研究中使用的聚二甲基硅氧烷膜在分离过程中表现出非常好的性能，导致浓缩因子在 70-140 范围内。此外，由 Arrhenius 图计算的水和 ACN 渗透的活化能表明，水通过膜的渗透对温度的依赖性大于 ACN。
