Effect of some parameters on the improvement of the bipolar membrane electrodialysis process
Effect of some parameters on the improvement of the bipolar membrane electrodialysis process
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DOI：
10.1016/j.desal.2006.03.584
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发表时间：
2007-04
期刊：
影响因子：
9.9
通讯作者：
I. Raissouni;M. Marraha;A. Azmani
中科院分区：
文献类型：
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作者：
I. Raissouni;M. Marraha;A. Azmani
对NaNO3溶液双极膜电渗析生产硝酸和苏打进行了研究，目的是强调双极膜电渗析池中辅助离子交换膜的作用。酸回收的效率很大程度上取决于阴离子交换膜的性能。关于这些效应，对几种工业阴离子交换膜进行了表征。我们的 BPM 电渗析结果导致我们选择了 AD-Solvay 膜。使用配备这种膜的一堆电池来研究在流经电池室的溶液浓度的影响下 HNO3 和 NaOH 的生产效率。分别测量盐、酸和碱溶液的影响。结果表明，随着盐浓度的增加，酸和碱的法拉第产率增加并趋于极限值。初始酸和碱浓度的增加降低了法拉第产率以及最终酸和碱浓度与初始浓度的比率。通过改变在盐室中循环的 NaNO3 溶液的体积进行了类似的研究。随着盐溶液体积的增加，酸浓度从初始值 0.1M 变化到 3.9 N，碱浓度从初始值 4.5 N 变化。在混合 NaNO3-NaCl 盐溶液的双极膜电渗析的情况下对酸产生进行了一些测量。
A study of electrodialysis with biploar membranes of NaNO3solutions to produce nitric acid and soda wasperformed with the object of stressing the role of the auxiliary ion-exchange membranes used to equip the bipolarmembrane electrodialysis cell. Efficiencies of the recovery of acid largely depend on the anion-exchange membraneproperties. In relation to such effects, characterization of several industrial anion-exchange membranes wasperformed. Our results of BPM electrodialysis led to select the AD-Solvay membrane. A stack of cells equipped withthis membrane was used to study the efficiency of HNO3and NaOH production under the influence of theconcentrations of the solutions that were flowing across the cell compartments. Measurements were performedseparately for the effects of salt, acid and base solutions. It is shown that with increasing salt concentration the faradicyields of both acid and base increase and tend towards limiting values. The increase of initial acid and baseconcentration reduces the faradic yields as well as the ratio of the final to the initial acid and base concentration. Asimilar investigation was made by changing the volume of the NaNO3solution that circulates across the saltcompartment. With increasing volumes of salt solutions, concentrations vary from an initial value of 0.1M to 3.9 Nfor acid and 4.5 N for base. Some measurements of acid production were made in the case of bipolar membraneelectrodialysis of a mixed NaNO3–NaCl salt solution.