电渗析使用零间隙电极生产浓缩产品没有显著的溶液电阻损失。

IF 3.3 4区 工程技术 Q2 CHEMISTRY, PHYSICAL
W Henry Freer, Charles Perks, Charles Codner, Paul A Kohl
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引用次数: 0

摘要

电化学分离利用离子电流驱动离子流过离子交换膜,产生稀释和浓缩的流。这些系统的经济性具有挑战性,因为通过稀释溶液的离子电流通常需要较小的电池间隙来降低离子电阻,并且使用低电流密度来最小化稀释产品流的电压降。产品流中较低的盐浓度提高了盐的回收率,但由于高欧姆损耗而增加了电力成本。通过降低电流密度来控制电力成本,从而大大增加了电厂的平衡。本研究中展示的电池结构消除了通过稀释产物流的离子电流的需要。离子电流只通过浓缩的产物流,这允许使用高电流密度和较小的植物平衡。该电池具有三个腔室,其阴离子和阳离子膜分别将阴极和阳极与浓缩产物溶液分开。该装置使用零间隙膜电极组件来提高电池电压和系统性能。当离子集中在中心隔室时,溶液电阻降低,与传统电渗析相比,产品以更低的电压惩罚回收。这种较低的电压降允许更快的进料流速和更高的电流密度。此外,该产品的较大孔隙为溶液中悬浮固体的系统提供了机会。发现离子收集效率随着电流的增加而增加,这是由于进料流中对流传质的增强。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Electrodialysis Using Zero-Gap Electrodes Producing Concentrated Product Without Significant Solution Resistance Losses.

Electrochemical separations use an ionic current to drive the flow of ions across an ion exchange membrane to produce dilute and concentrated streams. The economics of these systems is challenging because passing an ionic current through a dilute solution often requires a small cell gap to lower the ionic resistance and the use of a low current density to minimize the voltage drop across the dilute product stream. Lower salt concentration in the product stream improves the fraction of the salt recovered but increases the electricity cost due to high ohmic losses. The electricity cost is managed by lowering the current density which greatly increases the balance of the plant. The cell configuration demonstrated in this study eliminates the need to pass an ionic current through the diluted product stream. Ionic current passes only through the concentrated product stream, which allows use of high current density and smaller balance of the plant. The cell has three chambers with an anion and cation membrane separating the cathode and anode, respectively, from the concentrated product solution. The device uses zero-gap membrane electrode assemblies to improve the cell voltage and system performance. As ions concentrate in the center compartment, the solution resistance decreases, and the product is recovered with a lower voltage penalty compared to traditional electrodialysis. This lower voltage drop allows for faster feed flow rates and higher current density. Additionally, the larger cell gap for the product provides opportunities for systems with solids suspended in solution. It was found that the ion collection efficiency increased with current due to enhanced convective mass transfer in the feed streams.

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来源期刊
Membranes
Membranes Chemical Engineering-Filtration and Separation
CiteScore
6.10
自引率
16.70%
发文量
1071
审稿时长
11 weeks
期刊介绍: Membranes (ISSN 2077-0375) is an international, peer-reviewed open access journal of separation science and technology. It publishes reviews, research articles, communications and technical notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. Full experimental and/or methodical details must be provided.
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