Online neutralization promotes water dissociation equilibrium forward in bipolar membranes to achieve 9.2 mol/L NaOH production

被引：3

作者：

Wu, Shuang ^{[1
]}

Fu, Rong ^{[1
]}

Yan, Junying ^{[1
]}

Wang, Huangying ^{[1
]}

Wang, Baoying ^{[1
]}

Wang, Yaoming ^{[1
]}

Xu, Tongwen ^{[1
]}

机构：

[1] Univ Sci & Technol China, Sch Chem & Mat Sci, Key Lab Precis & Intelligent Chem, Anhui Prov Engn Lab Funct Membrane Sci & Technol, Hefei 230026, Anhui, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2024年 / 490卷

基金：

中国国家自然科学基金;

关键词：

Bipolar membrane; Electrodialysis; Water dissociation; Chlor-alkali; Clean production; PROTON LEAKAGE; CHLORALKALI PROCESS; ELECTRIC-FIELD; ELECTRODIALYSIS; PERFORMANCE; INTEGRATION;

D O I：

10.1016/j.cej.2024.151610

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The bipolar membrane electrodialysis is a promising caustic soda production technique by taking advantage of the water dissociation under a reverse voltage bias. However, dissociation equilibrium is easily reached when forward water dissociation is equivalent to the back diffusion of acid and base into the salt chamber. Here, we propose manipulating the water dissociation equilibrium by introducing an online neutralization reaction for acid or base products. The results indicate that the online neutralization of the acid product could promote water dissociation forward in bipolar membranes, leading to an increase in the base yield of 27.7 % and a saving of 43.7 % in time in parallel with conventional operation. The boosting water dissociation via online acid neutralization results in the production of 9.2 mol/L NaOH, the highest recorded base concentration produced by bipolar membrane electrodialysis. The present study provides a simple and unique approach for manipulating the water dissociation equilibrium, suggesting the increasingly crucial role of bipolar membranes in base production.

引用

页数：9