高性能工业用聚砜平板复合膜的制备

Preparation of high-performance industrial purpose polysulfone flat composite membrane

考察了浸没沉淀相转化法制备高性能工业用聚砜(PSF)平板复合膜的影响因素,确定N-甲基吡咯烷酮(NMP)/水为溶剂/非溶剂体系,铸膜液中聚砜的质量分数为12%~16%,基膜1作为复合膜的支撑层基膜,利用聚乙烯吡咯烷酮K30(PVPK30)和氯化锂(Li Cl)组成的复合添加剂及PSF/PVP/Li Cl/NMP质量比为15/5/3/77组成的铸膜液制备的聚砜平板复合膜,用于石化废水处理,COD和浊度去除率分别为79.5%和96.8%,水通量为167.2 L/m2·h,废水处理效果明显,膜通量衰减慢,抗污染能力强。

The influencing factors for using immersion precipitation phase inversion method to prepare high performance industrial-purpose polysulfone（ PSF） flat composite membrane are studied. It has been proved through experiments if N-methyl pyrrolidone（ NMP）/H2O are used as the solvent/non-solvent system,the mass percentage of polysulfone in the casting solution is in the range of 12%-16%,basement membrane 1 is used as the support layer of composite membrane,polyvinylpyrrolidone K30（ PVP K30） and lithium chloride（ Li Cl） are used as composite additives,and quality percentage of PSF/PVP/Li Cl/NMP in the casting solution is 15/5/3/77,then the prepared PSF flat composite membrane when is used in the petrochemical wastewater treatment can make the removal rates of COD and turbidity reach 79. 5% and 96. 8% respectively,and the water flux reach 167. 2 L/m2·h. The wastewater treatment efficiency is obvious,with the slow flux decline and high anti-pollution ability.