电渗析-超滤耦合技术研究进展

doi:10.16085/j.issn.1000-6613.2020-1316

摘要/Abstract

摘要：

电渗析-超滤耦合技术（EDUF）是一项用于分离带电有机物的新型技术，用超滤膜替换一部分离子交换膜，或将超滤膜嵌入到传统电渗析器中，从而形成一种超滤与电渗析内部结合的新型分离技术。该技术一方面利用超滤膜的孔径差异性分离不同分子量的带电有机物，另一方面利用电驱动原理克服压力驱动式超滤膜的膜污染问题，在营养食品、生物制药等领域用于分离提纯活性有机物组分，展示出了良好的应用优势。本文聚焦于电渗析-超滤耦合技术的产生和发展，详细介绍了该技术的技术原理及应用优势，重点阐述了影响其分离效率的主要因素，包括pH、超滤膜切割分子量（MWCO）、电场强度、膜对结构等。最后，从提高分离效率、降低系统能耗、超滤膜材质、水解液预处理、系统泄漏等角度提出了未来的研究方向，为该技术的研究和应用提供指导。

关键词: 电渗析, 超滤, 耦合, 有机物, 分离

Abstract:

Electrodialysis with ultrafiltration membrane(EDUF) is a innovative technology for separation of organic charged molecules. It is an internal combination of electrodialysis (ED) and UF processes, with UF membranes are stacked or replaced partial ion-exchange membranes in a conventional ED stack. The ultrafiltration membrane is stacked as a different molecular barrier according to the different molecular weight cut-off of the UF membrane. And the driving force of the process is an external electric field, contrary to pressure-driven processes, no significant fouling at membrane interface was detected. It has been found effective in numerous potential applications in the food and bio-pharmaceutical industry for the separation and the recovery of bioactive compounds. In this process, it is the focus of the emergence and development of EDUF. The main factors affecting the separation efficiency are discussed, inclouding pH, the molecular weight cut-off of the UF membrane(MWCO), the appropriate electric field, stack configuration and so on. Finally, the future research direction is proposed for improving separation efficiency, reducing system energy consumption, ultrafiltration membrane material, hydrolysate pretreatment, system leakage. It will provide guidance for the research and application of this technology.

Key words: electrodialysis, ultrafiltration, coupling, organic matter, separation

中图分类号:

苏慧超, 张田明, 吴云奇, 徐国荣. 电渗析-超滤耦合技术研究进展[J]. 化工进展, 2020, 39(S2): 1-7.

Huichao SU, Tianming ZHANG, Yunqi WU, Guorong XU. Development of electrodialysis with ultrafiltration membrane technology[J]. Chemical Industry and Engineering Progress, 2020, 39(S2): 1-7.

图/表 5

图1 EDUF分离原理图

图2 分离阳离子有机物的膜对结构图

图3 分离阴离子有机物的膜对结构图

图4 同时分离阴阳离子的膜对结构图

图5 两种膜对结构对比

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