Efficient SO2 removal using aqueous ionic liquid at low partial pressure

doi:10.1016/j.cjche.2022.09.021

Chinese Journal of Chemical Engineering ›› 2023, Vol. 58 ›› Issue (6): 355-363.DOI: 10.1016/j.cjche.2022.09.021

Efficient SO₂ removal using aqueous ionic liquid at low partial pressure

Yutong Jiang¹, Yifeng Chen^2,3, Fuliu Yang¹, Jixue Fan¹, Jun Li¹, Zhuhong Yang¹, Xiaoyan Ji⁴

1. College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China;
2. Institute of Chemical Industry of Forest Products, CAF, Key Laboratory of Biomass Energy and Material, Jiangsu Province, Nanjing 210042, China;
3. Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China;
4. Energy Engineering, Division of Energy Science, Luleå University of Technology, Luleå 97187, Sweden

Received:2022-04-18 Revised:2022-09-23 Online:2023-08-31 Published:2023-06-28
Contact: Yifeng Chen,E-mail:yfchen@icifp.cn;Zhuhong Yang,E-mail:zhhyang@njtech.edu.cn
Supported by:
We would like to thank the National Natural Science Foundation of China (22108115, 21776123). Y. Chen thanks China Postdoctoral Science Foundation funded project (2021 M691554) and Kempe foundation (SMK21-0020) in Sweden, and X. Ji thanks Swedish Energy Agency (P50830-1).

Efficient SO₂ removal using aqueous ionic liquid at low partial pressure

Yutong Jiang¹, Yifeng Chen^2,3, Fuliu Yang¹, Jixue Fan¹, Jun Li¹, Zhuhong Yang¹, Xiaoyan Ji⁴

1. College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China;
2. Institute of Chemical Industry of Forest Products, CAF, Key Laboratory of Biomass Energy and Material, Jiangsu Province, Nanjing 210042, China;
3. Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China;
4. Energy Engineering, Division of Energy Science, Luleå University of Technology, Luleå 97187, Sweden

通讯作者: Yifeng Chen,E-mail:yfchen@icifp.cn;Zhuhong Yang,E-mail:zhhyang@njtech.edu.cn
基金资助:
We would like to thank the National Natural Science Foundation of China (22108115, 21776123). Y. Chen thanks China Postdoctoral Science Foundation funded project (2021 M691554) and Kempe foundation (SMK21-0020) in Sweden, and X. Ji thanks Swedish Energy Agency (P50830-1).

Abstract

Abstract: The development of novel absorbents is essential for SO₂ removal. In this study, a novel ionic liquid (IL, [BHEP][HSO₄]) was prepared, and water was selected as the co-solvent. The density and viscosity of aqueous [BHEP][HSO₄] were measured and the SO₂ absorption performance was systematically investigated. Furthermore, the thermodynamic properties of SO₂ in aqueous [BHEP][HSO₄] were calculated. Additionally, the mechanism of SO₂ absorption in aqueous [BHEP][HSO₄] was confirmed using Fourier-transform infrared and nuclear magnetic resonance spectroscopy. It showed that [BHEP][HSO₄] absorbed 0.302 g·g^-1 (g SO₂/g IL) at an SO₂ partial pressure of 2000 μl·L^-1 at 303.2 K, and the SO₂ desorption enthalpy was -39.63 kJ·mol^-1. The mechanistic study confirmed the chemical absorption of SO₂ in aqueous [BHEP][HSO₄].

Key words: Ionic liquids, Sulfur dioxide, Absorption capacity, Desorption enthalpy

摘要： The development of novel absorbents is essential for SO₂ removal. In this study, a novel ionic liquid (IL, [BHEP][HSO₄]) was prepared, and water was selected as the co-solvent. The density and viscosity of aqueous [BHEP][HSO₄] were measured and the SO₂ absorption performance was systematically investigated. Furthermore, the thermodynamic properties of SO₂ in aqueous [BHEP][HSO₄] were calculated. Additionally, the mechanism of SO₂ absorption in aqueous [BHEP][HSO₄] was confirmed using Fourier-transform infrared and nuclear magnetic resonance spectroscopy. It showed that [BHEP][HSO₄] absorbed 0.302 g·g^-1 (g SO₂/g IL) at an SO₂ partial pressure of 2000 μl·L^-1 at 303.2 K, and the SO₂ desorption enthalpy was -39.63 kJ·mol^-1. The mechanistic study confirmed the chemical absorption of SO₂ in aqueous [BHEP][HSO₄].

关键词: Ionic liquids, Sulfur dioxide, Absorption capacity, Desorption enthalpy

Yutong Jiang, Yifeng Chen, Fuliu Yang, Jixue Fan, Jun Li, Zhuhong Yang, Xiaoyan Ji. Efficient SO₂ removal using aqueous ionic liquid at low partial pressure[J]. Chinese Journal of Chemical Engineering, 2023, 58(6): 355-363.

Yutong Jiang, Yifeng Chen, Fuliu Yang, Jixue Fan, Jun Li, Zhuhong Yang, Xiaoyan Ji. Efficient SO₂ removal using aqueous ionic liquid at low partial pressure[J]. 中国化学工程学报, 2023, 58(6): 355-363.

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Efficient SO₂ removal using aqueous ionic liquid at low partial pressure

Efficient SO₂ removal using aqueous ionic liquid at low partial pressure

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