Pretreatment of poly(acrylic acid) sodium by continuous diafiltration and time revolution of filtration potential

作     者：XU Jing-yuan TANG Shu-yun QIU Yun-ren 徐静远;汤淑云;邱运仁

作者机构：School of Chemistry and Chemical Engineering Central South University 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2019年第26卷第3期

页      面：577-586页

核心收录：

学科分类：080706[工学-化工过程机械] 08[工学] 0807[工学-动力工程及工程热物理] 

基　　金：Projects(21176264 21476265)supported by the National Natural Science Foundation of China 

主　　题：pretreatment diafiltration ultrafiltration poly(acrylic acid) sodium filtration potential 

摘      要：The pretreatment for the removal of small molecules from poly(acrylic acid) sodium (PAAS) solution by continuous diafiltration was investigated using ultrafiltration membrane. The effects of PAAS concentration, pH, trans-membrane pressure and pretreatment time on the permeate concentration and permeate flux were studied. The results show that the necessary pretreatment time (NPT) increases with PAAS concentration, decreases with TMP. The change trend of permeate flux with time is affected by pH. The permeate fluxes rapidly decrease from the start, and then increase gradually to stable values at pH 5.0, pH 7.0 and pH 9.3. However, it decreases gradually with time till a state value at pH 3.0 (iso-electric point, IEP). The removal of small molecules is easy at pH greater than iso-electric point (IEP). The change of filtration potential with time indicates the similar trend to that of permeation concentration, but the former is more convenient for indication of NPT.