双极膜电渗析质子渗漏相关因素的分析

Analysis correlative factor with proton leakage during the process of bipolar membrane electrodialysis

采用恒流三室双极膜电渗析方式,利用同一种阴离子交换膜和两种不同型号的双极膜对Na2SO4溶液再生H2SO4和NaOH过程中酸室H+离子渗漏进行了研究,分析了双极膜及电渗透水通量与双极膜电渗析(BMED)再生酸碱中酸室H+离子渗漏的相互作用.实验结果表明:在相同电流密度条件下,双极膜的膜电阻越小,酸室电渗透水的通量越大,进而酸室质子渗漏的百分数越小.酸室H+渗漏携带的水量仅为酸室渗漏"逃水"水量的一部分.

H2SO4 and NaOH were regenerated from NazSO4 solution under constant current density by bi- polar membrane electrodialysis（BMED） of three cells. The process of BMED was studied by two types of bipolar membrane （BPM） and the same anion exchange membrane. The interactions between bipolar mem- brane quality, water flux in acid cell and proton leakage in the regeneration process of acid were analyzed. The results show that under constant current density, as the resistance of bipolar membrane decreases, the water flux in acid cell increases and the percentage of the proton leakage in acid cell goes down. The lost water amount caused by proton leakage is only a small part of the total water losses in acid cell.