电解法研究DF988膜对钠离子的水传递数  

Electrolysis study on water transfer number of Na^+ through DF988 ion-exchange membrane

作　　者：王学军 王婧 张恒 张永明[1,2,3] 

机构地区：[1]山东东岳高分子材料有限公司,桓台256401 [2]东岳集团有限公司技术中心,桓台256401 [3]上海交通大学化学化工学院,上海200240

出　　处：《膜科学与技术》2012年第6期59-63,共5页Membrane Science and Technology

基　　金：国家"十二五"科技支撑计划资助项目(2011BAE08B04)

摘　　要：离子膜电解过程中,水分子伴随阳离子通过离子膜而发生移动的现象称为水的电渗透或水传递.简要介绍了国产DF988离子交换膜的结构.通过傅立叶红外光谱(ATR-FTIR)对DF988膜表面进行分析,表明其一侧为磺酸层另一侧为羧酸层即阻挡层.采用自制的电解测试装置对DF988膜的水传递进行了较为系统的实验研究,测定了不同条件下的水传递数和氢氧化钠中氯化钠含量,包括阳极液浓度、阴极液浓度、电流密度和温度等条件.结果表明,电解液浓度对水传递数有明显的影响,水传递数随盐水浓度的降低有明显的增大;而电流密度和温度等则对氢氧化钠中含氯化钠的量影响明显.In the process of ion-exchange membrane electrolysis, ions passing through an ion exchange membrane are accompanied by a solvation shell of water molecules, which is known as the electro-osmotic water flux or water transfer phenomenon. The structure of domestic DF988 ion-exchange membrane was introduced briefly. The attenuated total reflectance Fourier transform infrared （ATR-FTIR） spectra revealed that DF988 membrane do contain a sulfonic polymer layer and a carboxylic layer, the barrier layer. Research on water transfer phenomenon is conducive to understand the transference performance of DF988 membrane. The water transfer was investigated systematically using self-made electrolysis equipment. The water transfer number （tw） and the sodium chloride content in NaOH were determined under different conditions, including anolyte concentration, catholyte concentration, current density and temperature. The results show that water transfer number was remarkably affected by the concentration of the electrolytes. The decreasing of anolyte concentration can increase the water transfer number. While the current density and temperature have an obvious influence on the sodium chloride content in NaOH.

关 键 词：离子交换膜 水传递 电解 氯碱工业 烧碱 

分 类 号：TQ114.2[化学工程—无机化工] TQ028.8