Wang Z, Yang D. SO
2 capture by 2-pyridineethanol through the formation of a zwitterionic liquid.
Chem Commun (Camb) 2022;
58:6212-6214. [PMID:
35507031 DOI:
10.1039/d2cc01722a]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this work, we report the SO2 capture by 2-pyridineethanol (2-PyEtOH). 2-PyEtOH exhibits a high SO2 capacity, up to 1.16 g SO2 per g solvent at 1.0 atm. The effect of temperature and pressure on the SO2 absorption by 2-PyEtOH is investigated. It is found that 2-PyEtOH can capture 0.57 g SO2 per g solvent even at a low SO2 partial pressure of 0.10 atm. Interestingly, the absorbed SO2 by 2-PyEtOH can be released at a low temperature of 50 °C, suggesting that 2-PyEtOH not only has a high capacity but also exhibits a regeneration process of low energy cost. Moreover, 2-PyEtOH also exhibits an excellent reversibility. The NMR and FTIR studies disclose that SO2 reacts with the -OH group of 2-PyEtOH, resulting in the formation of a zwitterionic sulfite. We believe that the findings of this work will be very useful for the design of efficient absorbents for SO2 capture.
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