硅橡胶膜在乙醇发酵-渗透蒸发耦合过程中的分离性能  被引量:8

Separation Performances of PDMS Membrane in an Ethanol Fermentation-pervaporation Coupled Process

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作  者:石尔[1] 黄卫星[1] 肖泽仪[1] 伍勇[1] 许荣强[1] 

机构地区:[1]四川大学化学工程学院,四川成都610065

出  处:《四川大学学报(工程科学版)》2004年第2期41-45,共5页Journal of Sichuan University (Engineering Science Edition)

基  金:国家自然科学基金资助项目 (2 0 2 760 3 0 )

摘  要:为掌握乙醇发酵 -渗透蒸发耦合过程中的膜分离行为 ,在发酵液温度 30~ 4 0℃、糖浓度 0~ 10 0g/L以及有无细胞存在的实验条件下 ,测试了乙醇通过硅橡胶膜的传质分离速率。结果表明 ,发酵温度升高促进渗透蒸发 ,但乙醇产率同时降低 ,导致过膜总通量增加而乙醇通量无明显变化 ,说明耦合过程操作温度应以实现高浓度连续发酵为控制因素 ;糖浓度增加对水分子在膜面的吸附有抑制作用 ,导致水的渗透通量减少 ,从而相对提高了膜对乙醇的选择性 ,分离因子提高 ;发酵液中细胞的存在促进了膜面的传质 ,有利于乙醇的渗透蒸发 ,过膜通量增加。To make clear of the behaviors of PDMS composite membrane for separating ethanol from a real yeast solution, the authors prepared a silicon rubber membrane and experimentally studied its pervaporation performances at the temperatures from 30°C to 40°C, the glucose concentrations from 0 g/L to 100 g/L and the yeast cell concentrations of 0 g/L and 55 g/L. The results show that higher temperature promotes the pervaporation but brings down the ethanol generation rate so that the solution flux through the membrane increases while the ethanol flux keeps nearly unchanged. With the increase of glucose concentration from 0 to 100 g/L, the total flux decreases 25% but the separation factor for ethanol increases from 7.71 to 9.99, suggesting that higher glucose concentration inhibits water molecules from being adsorbed to the membrane or, in other words, enhances the selectivity of membrane to ethanol. Also, the existence of cells stimulates the mass transfers on the membrane surface and, therefore, increase the flux or pervaporation of ethanol through the membrane.

关 键 词:乙醇 发酵反应器 硅橡胶膜 渗透汽化 

分 类 号:TQ028[化学工程]

 

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