双极膜电渗析解离NaCl清洁制备酸碱的实验研究

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1 王建友 已出版文章查询
王建友
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1 刘红斌 已出版文章查询
刘红斌
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1南开大学环境科学与工程学院,天津,300071

2军事医学科学院卫生装备研究所,天津,300161


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采用国产双极膜、均相阴、阳离子交换膜交替排列构成的三隔室双极膜电渗析(BMED)构型,以NaCl为原料制备NaOH和HCl.研究了电流密度、原料液浓度和电极液浓度对BMED操作性能的影响,并对两种不同的均相阳膜进行了对比考察.结果表明:在电流密度30 mA/cm2,NaCl原料液浓度为1.5mol/L的条件下,实验范围内NaOH的收率可达80.19%,其收率和能耗随电流密度的增大而增加;电流密度恒定时,较高的原料液浓度利于保持更小的膜堆电阻,过程能耗相应降低;本实验条件下,极室Na2SO4溶液在1%~2%的低浓度范围内时,过程运行效果较3%~4%的高浓度更优.采取进一步向原料室持续补充10%NaCl的操作时,5h后产品NaOH浓度可提高至10%左右,较间歇式操作时的4%水平有显著提高.

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语种: 中文   

基金天津市科技兴海专项资金(KJXH2011-007)

关键词双极膜 电渗析 氢氧化钠 盐酸


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