耐溶剂聚酰亚胺纳滤膜的制备与分离性能

摘要本文以均苯四甲酸二酐(PMDA)和4,4′ 二氨基二苯醚(ODA)为原料,采用相转化法制备了耐溶剂的聚酰亚胺(PI)纳滤膜。通过对原料进行预处理,调节反应时间,使得聚酰胺酸(PA)特性粘度稳定在0 99mL g。试验结果表明,当聚酰胺酸铸膜液质量分数为15%,溶剂挥发时间为30min,凝胶浴为乙醇质量分数30%的乙醇水溶液时,所制得的聚酰亚胺纳滤膜具有最佳的分离性能。操作压力为2MPa时,该膜对聚乙二醇300(PEG300)水溶液截留率可达91%,通量为5 75L (m2·h)。为进一步研究适用于有机溶剂体系的纳滤膜技术提供了基础。

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	李韡
	王霖
	张金利
	丁涛

关键词：纳滤膜聚酰亚胺

Abstract： In this study, solvent-resistant nanofiltration polyimide (PI) membrane was prepared from polyamic acid (PA) solution via immersion precipitation phase inversion process. Polyimide precursor was obtained from pyromellitic dianhydride (PMDA) and 4,4′-diaminodiphenyl ether (ODA). By performing the reactants pretreatment, adjusting reaction time, the characteristic viscosity of PA could be stabilized at 0.99 mL/g. The separation performance of the synthesized membrane was evaluated by using PEG300. The membrane prepared by 15% PA, evaporation for 30 min and the gel-bath of 30% ethanol aqueous solution showed a good PEG300 rejection rate up to 91% with a flux of 5.75 L/(m~2·h) when the operation pressure was 2 MPa. The prepared PI membrane will have promising applications in separations of organic solvent systems.

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Received 2005-05-15; published 2005-05-15

引用本文:

李韡,王霖,张金利,丁涛.耐溶剂聚酰亚胺纳滤膜的制备与分离性能[J]. 化学工业与工程, 2005,22(3): 166-171

LI Wei, WANG Lin, ZHANG Jin-li, DING Tao njin University,Tianjin 300072,China).Preparation and Separation Performance of Solvent-Resistant Polyimide Nanofiltration Membrane[J]. Chemcial Industry and Engineering, 2005,22(3): 166-171

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