Effective Absorption of Dichloromethane Using Carboxyl-Functionalized Ionic Liquids

Mengjun Wang, Manman Zhang, Shaojuan Zeng, Yi Nie, Tao Li, Baozeng Ren, Yinge Bai () and Xiangping Zhang ()
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Mengjun Wang: College of Chemical and Engineering, Zhengzhou University, Zhengzhou 450001, China
Manman Zhang: Longzihu New Energy Laboratory, Zhengzhou Institute of Emerging Industrial Technology, Zhengzhou 450000, China
Shaojuan Zeng: CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
Yi Nie: Longzihu New Energy Laboratory, Zhengzhou Institute of Emerging Industrial Technology, Zhengzhou 450000, China
Tao Li: College of Chemical and Engineering, Zhengzhou University, Zhengzhou 450001, China
Baozeng Ren: College of Chemical and Engineering, Zhengzhou University, Zhengzhou 450001, China
Yinge Bai: Longzihu New Energy Laboratory, Zhengzhou Institute of Emerging Industrial Technology, Zhengzhou 450000, China
Xiangping Zhang: Longzihu New Energy Laboratory, Zhengzhou Institute of Emerging Industrial Technology, Zhengzhou 450000, China

IJERPH, 2023, vol. 20, issue 10, 1-15

Abstract: Dichloromethane (DCM) is recognized as a very harmful air pollutant because of its strong volatility and difficulty to degrade. Ionic liquids (ILs) are considered as potential solvents for absorbing DCM, while it is still a challenge to develop ILs with high absorption performances. In this study, four carboxyl-functionalized ILs—trioctylmethylammonium acetate [N 1888 ][Ac], trioctylmethylammonium formate [N 1888 ][FA], trioctylmethylammonium glycinate [N 1888 ][Gly], and trihexyl(tetradecyl)phosphonium glycinate [P 66614 ][Gly]—were synthesized for DCM capture. The absorption capacity follows the order of [P 66614 ][Gly] > [N 1888 ][Gly] > [N 1888 ][FA] > [N 1888 ][Ac], and [P 66614 ][Gly] showed the best absorption capacity, 130 mg DCM/g IL at 313.15 K and a DCM concentration of 6.1%, which was two times higher than the reported ILs [Beim][EtSO 4 ] and [Emim][Ac]. Moreover, the vapor–liquid equilibrium (VLE) of the DCM + IL binary system was experimentally measured. The NRTL (non-random two-liquid) model was developed to predict the VLE data, and a relative root mean square deviation (rRMSD) of 0.8467 was obtained. The absorption mechanism was explored via FT-IR spectra, 1 H-NMR, and quantum chemistry calculations. It showed a nonpolar affinity between the cation and the DCM, while the interaction between the anion and the DCM was a hydrogen bond. Based on the results of the study of the interaction energy, it was found that the hydrogen bond between the anion and the DCM had the greatest influence on the absorption process.

Keywords: ionic liquids; dichloromethane; absorption; vapor-liquid equilibrium; NRTL model; quantum chemical calculations (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2023
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