界面聚合反应制备中空纤维纳滤膜的数学模型

来源期刊:中南大学学报(自然科学版)2009年第2期

论文作者:刘久清 李新海 王志兴 刘婉蓉

文章页码:294 - 298

关键词:复合膜;界面聚合;中空纤维膜;数学模型

Key words:composite membrane; interfacial polymerization; hollow fiber nanofiltration membrane; mathematic model

摘    要:采用界面聚合反应成膜机理制备中空纤维纳滤膜,建立在非稳态条件下化学反应-扩散控制的数学模型,并通过有针对性的简化,使该模型适用于扩散控制。以哌嗪-三乙胺水溶液作为水相,均苯三甲酰氯作为有机相单体,甲苯作为有机相溶剂进行界面聚合反应制备中空纤维膜,进而通过实验对数学模型进行验证。研究结果表明:通过模型计算,在反应达到10 s时,复合膜的厚度约为0.9 μm;从实验中甲苯体系反应10 s后得到的扫描电镜照片可以看到,此时复合膜的厚度为1 μm左右,说明界面聚合反应成膜原理能正确地指导建立数学模型;模型预测值与实验数据基本吻合;所建立的数学模型能够较好地揭示界面聚合反应成膜过程的实质。

Abstract: A mathematic model for the formation of the hollow fiber nanofiltration membrane by interfacial polymerization was established. The model described the process of interfacial polymerization controlled by both chemical reaction and diffusion control under non-steady-state conditions, which was applied into the process of diffusion control through the according simplification. At the same time, the experiment for the formation of membranes by interfacial polymerization reaction with piperazine-triethylamine as the aqueous phase, trimesol as organic monomer and toluene as the organic solvent in the organic phase respectively were made. The results show that after 10 s reaction, the thickness of composite membrane is up to 0.9 μm by model account when it’s up to about 1 μm by experiment. The model prediction tallies with experiment data, and a mathematical model established can prove the process of formation of the hollow fiber nanofiltration membrane by interfacial polymerization better.

基金信息:国家重点基础研究发展计划资助项目
国家自然科学基金资助项目

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