Solubility equilibrium of SO2 in the decalcified seawater

doi:10.16085/j.issn.1000-6613.2016.04.007

Chemical Industry and Engineering Progree ›› 2016, Vol. 35 ›› Issue (04): 1012-1016.DOI: 10.16085/j.issn.1000-6613.2016.04.007

• Chemical processes and equipments • Previous Articles Next Articles

Solubility equilibrium of SO₂ in the decalcified seawater

XIE Yinghui, CAO Hainan, ZHAO Yingying, YUAN Junsheng

School of Marine Science and Engineering, Hebei University of Technology, Tianjin 300130, China

Received:2015-11-02 Revised:2015-12-31 Online:2016-04-05 Published:2016-04-05

二氧化硫在脱钙后海水体系中的溶解平衡

谢英惠, 曹海楠, 赵颖颖, 袁俊生

河北工业大学海洋科学与工程学院, 天津 300130

通讯作者: 赵颖颖,副教授.E-mail:luckyzhaoyy@126.com;袁俊生,教授.E-mail:jsyuan2012@126.com.
作者简介:谢英惠(1958-),男,教授.E-mail:yinghuix@126.com.
基金资助:
国家"十二五"科技支撑计划(2015BAB09B00)、国家自然科学基金(21306037)、天津市自然科学基金(13JCQNJC05600、14JCYBJC20700)及河北省高层次人才资助项目(C2013003041).

Abstract

Abstract: Compared with normal seawater, the content of HCO₃^- in the seawater of calcium removed using CO₂ is higher. Because HCO₃^- can react with hydrogen sulfite produced by sulfur dioxide dissolving in water, which in return helps increase the solubility of sulfur dioxide. Therefore, the effect of the amount of HCO₃^- and Ca²⁺ on the solubility of sulfur dioxide in seawater was studied at temperatures of 34.0—63.9℃ with N₂ as inert carrier gas and under 1atm. The results showed that the solubility of SO₂ in standard seawater significantly reduced linearly with increasing temperature. The increase of HCO₃^- ion concentration in demineralized seawater will enhance the solubility of SO₂ in water. But there is no significant effect of the reduction of Ca²⁺ ion concentration on the SO₂solubility within the studied scope. It can be concluded that sulfur dioxide shows a better dissolution performance in the seawater decalcified by CO₂ than in the standard seawater, and this study provides a theoretical support to the coupling of flue gas desulfurization and seawater decalcification using CO₂.

Key words: decalcified seawater, solubility, sulfur dioxide

摘要： CO₂脱钙后海水与标准海水相比,具有更少的Ca²⁺和更多的HCO₃^-,理论上HCO₃^-可与SO₂溶于水后产生的亚硫酸氢根反应,促进SO₂的溶解.为此本文以N₂为惰性载气,研究了1atm下,温度变化范围为34.0~63.9℃,SO₂在标准海水、NaHCO₃含量增多的海水以及钙离子减少的海水中的溶解性能,以期实现海水CO₂脱钙与烟道气脱硫的耦合.结果表明SO₂在标准海水中的溶解度随着温度的升高显著降低,且SO₂溶解度的数值与温度呈近似线性关系;海水中HCO₃^-含量的增加会提高SO₂在此水体系中的溶解度;而海水中钙离子的减少对SO₂在此水体系中的溶解性能并无显著影响.因此与标准海水体系相比,CO₂脱钙后海水体系对SO₂具有更好的溶解性能,为利用CO₂脱钙后海水进行烟气脱硫,从而实现海水脱钙与烟气脱硫的耦合提供了理论支持及基础数据.

关键词: 脱钙海水, 溶解性能, 二氧化硫

CLC Number:

TQ132.2

XIE Yinghui, CAO Hainan, ZHAO Yingying, YUAN Junsheng. Solubility equilibrium of SO₂ in the decalcified seawater[J]. Chemical Industry and Engineering Progree, 2016, 35(04): 1012-1016.

谢英惠, 曹海楠, 赵颖颖, 袁俊生. 二氧化硫在脱钙后海水体系中的溶解平衡[J]. 化工进展, 2016, 35(04): 1012-1016.

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Solubility equilibrium of SO₂ in the decalcified seawater

二氧化硫在脱钙后海水体系中的溶解平衡

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