高性能醋酸纤维素正渗透膜的研制

Preparation of High Performance Cellulose Acetate(CA) Forward Osmosis Membrane

本文以醋酸纤维素(CA)为膜材料,N,N-二甲基甲酰胺(DMF)和丙酮作为溶剂体系,聚乙二醇400(PEG400)作为添加剂,聚酯筛网作为支撑层,利用相转化方法制备醋酸纤维素正渗透膜。论文系统研究了CA的含量、DMF与丙酮的比例、添加剂的含量、支撑层的目数以及凝固浴温度对膜性能的影响,结果表明,当CA的质量分数为16%、DMF:丙酮的体积比为1:0.6、PEG400的质量分数为4%、作为支撑层的筛网目数为120mol/L、凝固浴的温度为60℃时,所制备正渗透膜的性能最佳;利用1mol/L NaCl作为驱动液,去离子水作为原料液,在1h的测试时间里,所制备膜的纯水通量可达到15 L/(m2·h)以上,反向盐通量控制在7.5g/(m2·h)以下。

In this paper, the cellulose acetate （CA） as the membrane materials, the N, N - dimethylformamide （DMF） and acetone as the solvent system, the polyethylene glycol 400 （PEG400） as additive, the polyester screen mesh as the support layer. Preparation the cellulose acetate membrane using phase transformation method. Control the content of the CA, the DMF and acetone proportion,the PEG400 additive, the mesh number of support layer and the coagulation temperature for membrane performance. As the result, the better membrane performance of the mass fraction of CA is 16%, the DMF： acetone volume ratio of 1：0. 6, the PEG400 mass fraction of 4% , the support layer is 120 mesh, the coagulation temperature of 60 ~C. Using Imol/L NaC1 as the drive solution, deionized water as the feed solution, In one hour testing time,the water flux of the high performafice FO membrane reaches 15 L/（ m2 · h） o h or more, the reverse salt flue control at 7.5 g/（m2 · h） or less.