Formic acid regeneration by electromembrane processes
Formic acid regeneration by electromembrane processes
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DOI：
10.1016/j.memsci.2006.02.012
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发表时间：
2006-09-01
影响因子：
9.5
通讯作者：
Rakib, M.
中科院分区：
文献类型：
--
作者：
Ferrer, J. S. Jaime;Laborie, S.;Rakib, M.
对含有少量甲酸钠和氢氧化钠的水进行处理以再生甲酸。处理分三个步骤进行：废水中和、通过常规电渗析（ED）浓缩甲酸钠、通过双极膜电渗析（BMED）甲酸钠分解成甲酸和氢氧化钠。执行这些过程的耦合。 ED 的电流效率为 90%，甲酸钠浓度高达 2 mol dm(-3)。 BMED 在三室单元配置中进行。在电流密度为500 A·m(-2)时，得到浓度高达30%的甲酸溶液，电流效率为80%。分子甲酸的扩散解释了电流效率损失。电流效率随酸浓度和电流密度而变化。通过阴离子交换膜的扩散比通过双极膜的扩散更重要（2.5 倍）。 BMED 中产生的贫盐被回收到中和步骤。 (c) 2006 Elsevier B.V. 保留所有权利。
Waters containing low amounts of sodium formate and sodium hydroxide were processed in order to regenerate formic acid. The treatment was performed in three steps: wastewaters neutralization, sodium formate concentration by conventional electrodialysis (ED), and sodium formate splitting into formic acid and sodium hydroxide by bipolar membrane electrodialysis (BMED). A coupling of these processes was performed. ED was carried out with a current efficiency of 90% and sodium formate concentration up to 2 mol dm(-3). BMED was performed in a three-compartment cell configuration. Formic acid solution up to 30% was obtained with current efficiency of 80% under a current density of 500 A m(-2). Diffusion of molecular formic acid explains the current efficiency loss. The current efficiency varies with acid concentration and current density. Diffusion is more important through the anion-exchange membrane than through the bipolar membrane (2.5-fold). Depleted salt produced in BMED was recycled to the neutralisation step. (c) 2006 Elsevier B.V. All rights reserved.