复合反渗透膜的制备研究
发布时间：2019-03-25 21:51
【摘要】：复合反渗透膜因其分离层和基膜为两种不同材料,可以针对不同要求分别进行优化使膜整体性能达到最优,因此得到了广泛应用。本文从基膜和分离层的制备工艺出发,分别探讨各主要制备工艺参数对基膜和分离层性能的影响,为进一步的研究奠定基础。首先是聚砜基膜的制备。以N-甲基吡络烷酮为溶剂,聚砜为溶质配制铸膜液,采用浸没相转化法制备基膜,分别探讨聚砜浓度、添加剂PEG分子量和含量、凝固浴组成、凝固浴温度等工艺参数对基膜纯水通量、BSA截留率、孔隙率、平均孔径等膜特征的影响,最终选择PSF21%,PEG-2000浓度8%,凝固浴组成W水:Wnmp=10:3,凝固浴温度为35℃为聚砜基膜的制备工艺参数。其次在自制的基膜上界面聚合脱盐功能层。探讨间苯二胺浓度、均苯三甲酰氯浓度、水相溶液pH值、反应时间、热处理温度和时间对分离层的形成及对复合反渗透膜整体性能的影响,初步确定最佳界面聚合反应工艺:间苯二胺浓度2%,均苯三甲酰氯浓度0.08%,水相溶液pH=9,反应时间20s,热处理温度60℃,热处理时间10 min。在此制备工艺参数下制备的反渗透膜脱盐率为97.13%,通量为 45.23 L/m2·h。最后探讨了极性非质子添加剂二甲基亚砜(DMSO)对反渗透膜通量和脱盐率的影响,并对外部运行条件对反渗透系统的影响因素做了总结。
[Abstract]:The composite reverse osmosis membrane has been widely used because its separation layer and base membrane are two kinds of different materials which can be optimized according to different requirements to achieve the optimal overall performance of the membrane. Based on the preparation technology of base membrane and separation layer, the influence of main preparation parameters on the performance of base membrane and separation layer is discussed in this paper, which lays a foundation for further research. The first is the preparation of polysulfone based membrane. The casting solution was prepared with N-methylpyrrolidone as solvent and polysulfone as solute. The substrate membrane was prepared by immersion phase inversion method. The concentration of polysulfone, molecular weight and content of additive PEG, composition of coagulation bath were discussed respectively. The effects of coagulation bath temperature on membrane characteristics such as pure water flux, BSA retention, porosity, average pore diameter and so on were studied. Finally, the concentration of PSF21%,PEG-2000 was 8% and the composition of W water: Wnmp=10:3, in solidification bath was composed of W water: Wnmp=10:3,. The coagulation bath temperature is 35 鈩，
本文编号：2447353
[Abstract]:The composite reverse osmosis membrane has been widely used because its separation layer and base membrane are two kinds of different materials which can be optimized according to different requirements to achieve the optimal overall performance of the membrane. Based on the preparation technology of base membrane and separation layer, the influence of main preparation parameters on the performance of base membrane and separation layer is discussed in this paper, which lays a foundation for further research. The first is the preparation of polysulfone based membrane. The casting solution was prepared with N-methylpyrrolidone as solvent and polysulfone as solute. The substrate membrane was prepared by immersion phase inversion method. The concentration of polysulfone, molecular weight and content of additive PEG, composition of coagulation bath were discussed respectively. The effects of coagulation bath temperature on membrane characteristics such as pure water flux, BSA retention, porosity, average pore diameter and so on were studied. Finally, the concentration of PSF21%,PEG-2000 was 8% and the composition of W water: Wnmp=10:3, in solidification bath was composed of W water: Wnmp=10:3,. The coagulation bath temperature is 35 鈩，
本文编号：2447353
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