Solubility of sulfur dioxide in tetraglyme-NH4SCN ionic liquid: high absorption efficiency

Qiang Xu; Wei Jiang; Jianbai Xiao; Xionghui Wei

doi:10.1039/c8ra08991d

Solubility of sulfur dioxide in tetraglyme-NH₄SCN ionic liquid: high absorption efficiency

RSC Adv. 2018 Dec 18;8(73):42116-42122. doi: 10.1039/c8ra08991d. eCollection 2018 Dec 12.

Authors

Qiang Xu¹, Wei Jiang¹, Jianbai Xiao¹, Xionghui Wei¹

Affiliation

¹ College of Chemistry and Molecular Engineering, Peking University 100871 PR China xhwei@pku.edu.cn.

Abstract

An easily prepared ionic liquid was synthesized by a one-step method and applied in SO₂ absorption efficiently. The cation of the ionic liquid is a supramolecular structure consisting of NH⁺ ₄ and tetraglyme, similar to the structure of NH⁺ ₄ and crown ether, and the anion is selected as SCN^-. The ionic liquid has good thermal stability. Under the conditions of 293 K and 1 bar, one mol ionic liquid can absorb 2.73 mol SO₂, which is about 30% higher than tetraglyme. The absorption mechanism was characterized using IR and NMR. And the results confirmed that the interaction mechanism between SO₂ and the ionic liquid is a physical interaction rather than a chemical interaction.