Preparation of high concentration polyaluminum chloride by chemical synthesis-membrane distillation method with self-made hollow fiber membrane

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• 作者：Changwei Zhao ; Yong Yan ; Deyin Hou ; Zhaokun Luan ; ^{zhaocw@rcees.ac.cn} ; ^{luanzk@rcees.ac.cn} ; Zhiping Jia
• 关键词：polyaluminum chloride ; membrane distillation ; high concentration ; high Alb content ; PVDF hollow fiber membrane
• 刊名：Journal of Environmental Sciences
• 出版年：2012
• 期刊代码：8_10010742
• 类别：env
• 出版时间：May, 2012
• 卷：24
• 期：5
• 页码：834-839
• 文件大小：925 K

摘要

A method of direct contact membrane distillation (DCMD) with a self-made hollow polyvinylidene fluoride membrane was applied to prepare high concentration polyaluminum chloride (PACl) with high Al_b content based on chemical synthesis. The permeate flux and Al species distribution were investigated. The experimental results showed that the permeate flux decreased from 14 to 6 kg/(m²路hr) at the end of the DCMD process, which can be mainly attributed to the formation of NaCl deposits on the membrane surface. The Alb content decreased slightly, only from 86.3%to 84.4%, when the DCMD experiment finished, correspondingly the Al_c content increased slightly from 7.2%to 8.5%, and the Al_a content remained at 7%during the whole DCMD process. A PACl with Al_b content of 84%at total aluminum concentration 2.2 mol/L was successfully prepared by the chemical synthesis-DCMD method.