操作条件对渗透汽化法分离乙醇/水的影响  

Effect of operating conditions on separation of ethanol/water by pervaporation

作　　者：李静舒[1] 孙王保[1] LI Jingshu;SUN Wangbao(Shanxi TV University,Taiyuan Shanxi 030027,China)

机构地区：[1]山西广播电视大学

出　　处：《山西化工》2019年第5期13-16,共4页Shanxi Chemical Industry

摘　　要：生物发酵产生燃料醇类过程中,由于发酵液产物复杂,产物抑制作用十分严重,极大地降低了发酵效率。将渗透汽化引入发酵过程中,采用透醇膜不断地移出发酵产物将十分有利于发酵过程的进行。实验采用聚二甲基硅氧烷(PDMS)/聚偏氟乙烯(PVDF)复合膜,将其应用于模拟醇类发酵液体系的分离。将操作温度、进料液浓度、膜下游侧压力等作为对复合膜渗透汽化性能的影响条件。实验结果表明,随着进料液温度的升高,通量随之升高,分离因子上升到一定值后下降。当温度为59.85℃时,分离因子达到最大,为9.37,通量为3.26 kg·m-2·h-1。膜下游侧压力越小,通量越大,分离因子越高;进料液浓度越高,总通量越高,分离因子降低。In the process of bio-fermentation to produce fuel alcohols,because of the complex fermentation broth products,the inhibition of the products is very serious,which greatly reduces the fermentation efficiency.The introduction of pervaporation into the fermentation process and the continuous removal of fermentation products by using pervaporation membrane will be very conducive to the fermentation process.Polydimethylsiloxane(PDMS)/polyvinylidene fluoride(PVDF)composite membranes were used to separate alcoholic fermentation liquid.The operating temperature,feed liquid concentration and downstream side pressure of the membrane were taken as the influencing factors on the pervaporation performance of the composite membrane.The experimental results show that with the increase of feed liquid temperature,the flux increases and the separation factor decreases after rising to a certain value.When the temperature was 59.85℃,the separation factor reached the maximum of 9.37 and the flux was 3.26 kg·m-2·h-1.The smaller the downstream side pressure,the larger the flux and the higher the separation factor.The higher the feed concentration,the higher the total flux and the lower the separation factor.

关 键 词：复合膜 操作温度 进料液浓度 膜下游侧压力 

分 类 号：TQ92[轻工技术与工程—发酵工程]