模拟发酵液中渗透汽化膜分离乙醇性能劣化研究  

Membrane degradation in pervaporation of a simulated fermentation broth

作　　者：曹中琦 陈宁[1] 王庚[1] 贾伟[1] 张卫东[1] CAO Zhongqi;CHEN Ning WANG Geng;JIA Wei;ZHANG Weidong(Beijing University of Chemical Technology,Beijing Key Laboratory of Membrane Science and Technology,Beijing,100029,China)

机构地区：[1]北京化工大学膜分离过程与技术北京市重点实验室,北京100029

出　　处：《膜科学与技术》2018年第6期22-26,40,共6页Membrane Science and Technology

基　　金：国家自然科学基金(21476010)

摘　　要：渗透汽化技术(PV)与乙醇发酵过程耦合可将发酵液中的乙醇原位移除,从而缓解产物抑制作用,提高乙醇产率.但是发酵液中所含的物质复杂,且其对膜渗透汽化性能的影响尚无定论.通过在乙醇水溶液中添加葡萄糖、甘油、琥珀酸以及无机盐等发酵液中的代表性物质,考察其对乙醇透过性能的影响.结果表明,无机盐、葡萄糖和甘油对PDMS膜的渗透汽化性能没有明显影响.琥珀酸容易在膜表面吸附沉积并进入膜内阻塞乙醇与水的通道,使渗透通量下降7%,是导致发酵-渗透汽化耦合过程中膜劣化的主要物质.琥珀酸、葡萄糖和甘油的协同作用使PDMS膜的渗透通量下降11.2%.Pervaporation(PV)integrated with an ethanol fermentation process has been employed to overcome product inhibition by removing ethanol from the fermentation broth.However,the fermentation broth is a complex mixture of components,and their effect the membrane performance is not well understood.In this study,glucose,glycerol and succinic acid were added to the ethanol aqueous solution in order to investigate their effects on ethanol permeation performance.The effects of adding salts,glucose and glycerol on the PDMS membrane performance were not signficiant.However,succinic acid was easily adsorbed on the membrane surface and into the membrane,blocking the ethanol water channels,resulting in a 7% decrease in flux.Therefore,succinic acid was shown to be the main component responsible for membrane degradation in the fermentation/PV process.The flux of the PDMS membrane decreased by11.2%as a result of the combined effects of succinic acid,glucose and glycerol.

关 键 词：乙醇发酵 渗透汽化 膜劣化 

分 类 号：TQ028.8[化学工程]