膜科学与技术

疏水膜、疏水性能评价及其自发脱水干燥

作者：吕晓龙，谷杰

单位： 1膜材料与膜应用国家重点实验室，天津膜天膜科技股份有限公司，天津300457； 2省部共建分离膜与膜过程国家重点实验室，材料科学与工程学院，生物化工研究所，天津工业大学，天津 300387

关键词：疏水膜，临界润湿值，透水压力，疏水膜干燥，自发脱水

出版年,卷(期):页码： 2024,44(1):1-7

摘要：

介绍了多孔疏水膜的定义、临界润湿值的概念、疏水膜的透水压力值和临界润湿值测试方法。区别于通常的外力加热等方法，介绍了利用疏水膜材料自身特性来实现疏水膜干燥的两种疏水膜自脱水干燥的方法。一种方法是控制膜污染润湿进程，当膜孔被润湿的深度小于该疏水膜材料的临界润湿值时，通过膜清洗实现疏水膜的自发脱水干燥。另一种方法是构建亲疏水双层复合疏水膜，当膜运行至产水电导率明显上升时，停机清洗，利用亲水材料与水之间的吸引力大于疏水材料与水之间的吸引力的特性使疏水膜孔自发脱水干燥。

This article introduces the definition of porous hydrophobic membranes, the concept of critical wetting value, the permeability pressure value of hydrophobic membranes, and the testing method of critical wetting value. Different from the usual methods such as external heating, this article introduces two methods of self dehydration and drying of hydrophobic membranes by utilizing the inherent characteristics of hydrophobic membrane materials. One method is to control the wetting process of membrane fouling. When the depth of membrane pores being wetted is less than the critical wetting value of the hydrophobic membrane material, membrane cleaning is used to achieve spontaneous dehydration and drying of the hydrophobic membrane. Another method is to construct a hydrophilic and hydrophobic bilayer composite hydrophobic membrane. When the membrane runs until the conductivity of the produced water increases significantly, it is shut down for cleaning. By utilizing the characteristic that the adhesion between hydrophilic materials and water is greater than that between hydrophobic materials and water, the hydrophobic membrane pores are spontaneously dehydrated and dried.

吕晓龙(1964-),男，山西忻州人，教授，研究方向为分离膜制备与应用。E-mail：13920286131@163.com

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