高化学耐久性反渗透膜片的制备与性能研究

RESEARCH ON PREPARATION AND PERFORMANCE OF REVERSE OSMOSIS MEMBRANE WITH HIGH CHEMICAL DURABILITY

考察了在聚酰胺反渗透膜片制备过程中,化学改性对提高膜性能的作用,以及改性后膜片的化学耐久性的提高程度。结果表明,经过化学改性的反渗透膜片脱盐率由99.4%提高至99.8%;并且耐酸碱性和耐氯性都有所提升:经过酸、碱和氯处理后改性膜片脱盐率下降至99.6%、99.4%和99.5%,而非改性膜片脱盐率下降至99.4%、98.2%和98.5%;改性膜片对于氧化剂高锰酸钾和过氧化氢抵抗能力并无明显提高。

In this paper, we studied the chemical durability of the aromatic polyamide reverse osmosis membrane modified by chemical agent. The results show that after the chemical modification, salt rejection ratio of reverse osmosis membrane increased from 99.4% to 99.8%, and the resistance to acid, alkali and chlorine improved. After the acid, alkali and chlorine treatment, the salt rejection ratio of modified membrane reduced to 99.6%, 99.4% and 99.5%, and the salt rejection ratio of unmodified membrane reduced to 99.4%, 98.2% and 98.5%. Modified membrane does not show better chemical resistance to hydrogen peroxide and potassium permanganate.