应用响应面法优化3,3 ',5,5'-联苯四甲酰氯(BTEC)和间苯二胺(MPDA)界面聚合工艺中各影响因素(水相单体浓度、有机相单体浓度、聚合时间以及水相浸没时间),研究各影响因素及其交互作用对膜分离性能的影响.通过中心组合设计实验,并采用回归分析拟合得到二次方模型.结果发现BTEC浓度、MPDA浓度、聚合时间和水相浸没时间对脱盐率的影响显著性依次降低.BTEC和MPDA单体浓度的交互作用对膜脱盐率影响最显著,其次是MPDA浓度与聚合时间的交互作用,而BTEC浓度与水相浸没时间的交互作用最弱.最优操作参数:MPDA浓度9.1 g/L、BTEC浓度1.2 g/L、水相浸没时间65 min、聚合时间123 s,预测脱盐率为99.10％,而在此条件下实际值为98.97％,二者十分接近.在此条件下得到致密均一的聚酰胺复合膜.%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 is BTEC concentration>MPDA concentration> reaction time> immersion time in aqueous phase. The interaction effect between MPDA concentration and BTEC concentration on the rejection is most significant and followed by the effect between MPDA concentration and reaction time; whereas the interaction effects between immersion time in aqueous phase and BTEC concentration is the weakest. The optimal reaction conditions are 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 are uniform and dense, which is responsible for the high separation performance.
展开▼
