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模拟发酵液中渗透汽化膜分离乙醇性能劣化研究

作者：曹中琦，陈宁，王庚，贾伟，张卫东

单位：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

关键词：乙醇发酵；渗透汽化；膜劣化

DOI号：

分类号： TQ028.8

出版年,卷(期):页码： 2018,38(6):22-26

摘要：

渗透汽化技术（Pervaporation，简称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。本文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 integrated with ethanol fermentation process was applied to overcome the product inhibition by removing ethanol from fermentation broth. However, the component of fermentation broth was complex, and the effect on membrane performance was inconclusive. In this study, glucose, glycerol and succinic acid was added to the ethanol aqueous solution to investigate the effect on ethanol permeation performance. Experimental results show that effects of salts, glucose and glycerol on the PDMS membrane performance were not obvious. Succinic acid was easy to adsorb on the membrane surface and into the membrane to block the ethanol water channel, which result in a 7% decrease of flux. Therefore, succinic acid was the main component that result in the membrane degradation in the fermentation/PV process. The flux of PDMS membrane decrease 11.2% result from the cooperative organization of succinic acid, glucose and glycerol.

基金项目：

项目来源“国家自然科学基金”（21476010）

作者简介：

第一作者简介：曹中琦（1990-），男，辽宁省锦州市人，博士研究生，研究方向为膜材料与膜分离过程，E-mail：caozqmembr@163.com 通讯作者，Email：zhangwd@mail.buct.edu.cn

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