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Process optimization of preparation of thin film composite membrane using response surface methodology

Authors： LIU Yu, HE Benqiao*, LI Jianxin

Units： State Key Laboratory of Hollow Fiber Membrane Materials and Processes, School of Materials Science and Engineering, Tianjin Polytechnic University, Tianjin 300160, China

KeyWords： Response surface methodology; Aromatic polyamide; Hollow fiber membrane; Reverse osmosis

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2011,31(6):19-24

Abstract：

A novel reverse osmosis hollow fiber membrane was prepared by interfacial polymerization from 3,3',5,5'-biphenyl tetraacyl chloride (BTEC) and m-phenylenediamine (MPDA). A systematic experimental design based on the response surface methodology was used to investigate the effects of preparation factors (MPDA concentration, BTEC concentration, immersion time in aqueous phase and reaction time) on the separation properties of the membrane. A quadratic polynomial equation was obtained by multiple regression analysis. It is found that the order of their effects on the rejection was BTEC concentration > MPDA concentration > reaction time > immersion time in aqueous phase. The interaction effect between MPDA concentration and BTEC concentration on the rejection was most significant and followed by the effect between MPDA concentration and reaction time; nevertheless the interaction effects between reaction time and MPDA concentration was less significant. Furthermore, the optimal reaction conditions were MPDA concentration of 9.1 g/L, BTEC concentration of 1.2 g/L, aqueous immersion time of 65 min and reaction time 123 s. The experimental rejection was 98.97%, close to the predicted rejection (99.10%) by the equation. The morphologies of the membrane obtained under the conditions were uniform and dense, which was responsible for the high separation performance.

Funds：

国家高科技（863）计划（项目编号2009AA03Z223)；国家自然科学基金（项目编号20876115）天津市应用基础及前沿技术研究计划(项目编号 08JCYBJC26400)。

AuthorIntro：

刘宇（1984- ），女，辽宁省抚顺市人，在读硕士，从事反渗透复合膜的研究。联系人电话： 022-24528072，hebenqiao@tjpu.edu.cn.

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