膜科学与技术

纯水体系下纳滤膜分离过程热力学问题研究

作者：阳红，叶春松²，张会琴³，王建华¹，徐伟¹ 刘海鑫¹ 余敦耀¹ 杨军¹

单位： 1. 中船重工环境工程有限公司武汉 430064；2. 武汉大学动力与机械学院武汉 430072；3. 湖北工业大学武汉 430068

关键词：纳滤膜；热力学；纯水体系

出版年,卷(期):页码： 2014,34(5):79-83

摘要：

本文采用NF270和GE DK纳滤膜，在不同压力、温度和pH条件进行纯水过滤试验，以测定不同条件下两种纳滤膜的膜通量，并研究不同条件下的纳滤膜渗透系数变化规律；构建纳滤膜渗透系数与热力学参数之间的关系式，计算两种纳滤膜的热力学参数，分析两种纳滤膜分离过程热力学原理。结果表明：两种纳滤膜的膜通量随着温度和压力的增加而增大，两种纳滤膜的渗透系数随着温度升高而增大，并随着压力和pH的变化呈现小幅波动；GE DK纳滤膜的活化能高于NF 270纳滤膜的活化能，分别为14.22KJ/mol和16.56KJ/mol。由此可知，在分离过程中GE DK纳滤膜比NF 270纳滤膜需更高的运行压力。

The two nanofiltration (NF) membranes, NF 270 and GE DK, were tested for the filtration processin pure water system at different temperatures, operating pressures and pH for water. The fluxes of two NF membranes were determined, and the variations of pure water permeability coefficient of NF membranes were discussed. The relationship between pure water permeability coefficient of NF membranes and thermodynamic parameters were conducted and the thermodynamic parameters of two types of NF membranes were calculated. Following that, the principle of the filtration process of NF membrane was discussed. The experimental results show that the fluxes of two NF membranes increased with increasing the temperature and operating pressure. The pure water permeability coefficient of both NF membranes also increased with increasing the temperature and fluctuated within a narrow range regardless of operating pressure and pH for water. The activation energy of GE DK membrane is higher than that of NF 270membrane, 16.56KJ/mol and 14.22 KJ/mol, respectively, indicating that GE DK membrane requires more energy to run than NF 270 membrane.

阳红（1980-），男，湖北武汉人，博士，中船重工环境工程有限公司，工程师，水处理及污泥资源家技术，

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