Preparation of NaOH for CO2 capture by electrolysis of Na2SO4

doi:10.16085/j.issn.1000-6613.2023-1474

Abstract

Abstract:

As an important means of carbon capture in flue gas, chemical absorption has been widely used in various demonstration projects. Among them, the sodium alkali method has the advantages of low volatility, low toxicity and low cost compared to the current mainstream absorption method. In this paper, to deal with the acidic gas CO₂ in flue gas and the desulfurization wastewater containing Na₂SO₄ after dry desulfurization and SO₂ removal, electrolytic Na₂SO₄ and CO₂ capture by NaOH aqueous solution were coupled to analyze the electrolytic efficiency and NaOH yield under different conditions, explore the absorption effect of CO₂ capture in absorption equilibrium experiment and spray tower, and compare the crystallization amount of NaHCO₃ under different conditions. The electrolysis efficiency and NaOH yield under various conditions were analyzed. The CO₂ absorption equilibrium experiment showed that the electrolytic product NaOH had a higher absorption amount and absorption rate than Na₂CO₃, and MEA could further enhance the CO₂ absorption effect of NaOH. When the temperature was 50℃ and the liquid-gas ratio was 167, the CO₂ capture effect in the spray tower was optimal with an absorption rate of 98.67%. Fine crystalline rod-shaped NaHCO₃ powder can be obtained and the maximum crystallization amount can reach 22.447g.

Key words: electrodialysis, carbon dioxide capture, absorption, crystallization, spray tower

摘要：

化学吸收法作为当前烟气碳捕集的重要手段已经广泛应用于各项示范工程中，其中钠碱法相较于当前主流吸收法具有低挥发、低毒性、低成本的优点。为了应对烟气中的酸性气体CO₂以及干法脱硫脱除SO₂后的含Na₂SO₄废水，利用双极膜电渗析法将电解Na₂SO₄与NaOH捕集CO₂相结合，对不同条件下的电解效率和NaOH产率进行了分析，探究了在吸收平衡实验和喷淋塔中NaOH捕集CO₂的效果，并比较了不同条件下的NaHCO₃结晶量。结果表明，双极膜电渗析可以使Na₂SO₄有效电解为NaOH。CO₂吸收平衡实验表明电解产物NaOH相对于Na₂CO₃具有更高的CO₂吸收量和吸收速率，且乙醇胺（MEA）能进一步加强NaOH对CO₂的吸收效果。当温度为50℃和液气比为167时，喷淋塔中CO₂捕集效果最佳，吸收量达到CO₂理论吸收值的98.67%，可获取结晶细小的棒状NaHCO₃粉末，最大的结晶量可达22.447g。

关键词: 电渗析, 二氧化碳捕集, 吸收, 结晶, 喷淋塔

CLC Number:

TQ028.8

WANG Bowei, ZHENG Mingzhen, WANG Lemeng, FU Dong, WANG Shan, ZHU Shengjun, ZHAO Kun, ZHANG Pan. Preparation of NaOH for CO₂ capture by electrolysis of Na₂SO₄[J]. Chemical Industry and Engineering Progress, 2024, 43(S1): 604-614.

王博葳, 郑明朕, 王乐萌, 付东, 王珊, 朱生俊, 赵昆, 张盼. Na₂SO₄电解制备NaOH捕集CO₂[J]. 化工进展, 2024, 43(S1): 604-614.

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References 30

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名称	分子量	纯度	生产厂家
Na₂SO₄	142.04	AR，99%	阿拉丁试剂（上海）有限公司
NaOH	40	≥98%
无水Na₂CO₃	105.99	99.5%
乙醇胺（MEA）	61	99%
CO₂	44	99.9%	保定市京联气体厂
N₂	28.013	99.9%	保定市京联气体厂
变色硅胶	60.08	99%	永华化学股份有限公司

名称	分子量	纯度	生产厂家
Na₂SO₄	142.04	AR，99%	阿拉丁试剂（上海）有限公司
NaOH	40	≥98%
无水Na₂CO₃	105.99	99.5%
乙醇胺（MEA）	61	99%
CO₂	44	99.9%	保定市京联气体厂
N₂	28.013	99.9%	保定市京联气体厂
变色硅胶	60.08	99%	永华化学股份有限公司

名称	型号	生产厂家
在线式CO₂分析仪	UE-55	深圳市昂为电子有限公司
N₂质量流量控制器 (MFC)	CS 200A	北京七星华创精密电子科技股份有限责任公司
CO₂质量流量控制器 (MFC)	CS 200A	北京七星华创精密电子科技股份有限责任公司
集热式恒温加热磁力搅拌器	DF-101	巩义市予华仪器有限责任公司

名称	型号	生产厂家
在线式CO₂分析仪	UE-55	深圳市昂为电子有限公司
N₂质量流量控制器 (MFC)	CS 200A	北京七星华创精密电子科技股份有限责任公司
CO₂质量流量控制器 (MFC)	CS 200A	北京七星华创精密电子科技股份有限责任公司
集热式恒温加热磁力搅拌器	DF-101	巩义市予华仪器有限责任公司

项目	规格
喷淋塔材料	合成塑料
塔高/mm	360
塔径/mm	48
壁厚/mm	5
喷淋口直径/mm	1
进气口至底部距离/mm	80
出气口至顶部距离/mm	70
进气口、出气口、出液口孔径/mm	4

Preparation of NaOH for CO₂ capture by electrolysis of Na₂SO₄

Na₂SO₄电解制备NaOH捕集CO₂

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