CO2 Absorption in Composite of Aprotic Solvent and Iron-based Ionic Liquid

doi:10.7503/cjcu20220120

Abstract

Abstract:

Two kinds of aprotic solvents， polyethylene glycol dimethyl ether（NHD） and N， N-dimethylacetamide （DMAC）， which have excellent desulphurization and decarbonization ability， were selected to construct composite of BmimFeCl₄ and solvent as novel decarbonization agents. The effects of temperature， mass ratio of BmimFeCl₄/solvent and pressure on CO₂ solubility were investigated. The results show that high pressure and low temperature are more conducive to the dissolution of CO₂. The Henry coefficient of BmimFeCl₄/DMAC（7∶3） with 0.9181 MPa·L·mol^-1 at 298.2 K， is lower than BmimFeCl₄/NHD under the same conditions， indicating that the former has a larger absorption capacity for carbon dioxide. Fourier transform infrared spectroscopy（FTIR） spectra show that the absorptions of carbon dioxide by the two composites depends on physical absorption between CO₂ molecule and the functional groups of BmimFeCl₄ before and after CO₂ absorption. After five absorption-regeneration cycles of CO₂ with the two kinds of the iron-based ionic liquid composites， the amounts of CO₂ absorption reached 92.53% and 99.04% of the first absorption for BmimFeCl₄/NHD and BmimFeCl₄/DMAC， respectively. density functional theory（DFT） calculations and IRI analyses show that CO₂ is more likely to interact with ［Bmim］⁺ cations and DMAC molecules in BmimFeCl₄/DMAC， nevertheless， in BmimFeCl₄/NHD， CO₂ is more likely to interact with ［FeCl₄］^- anions and NHD molecules.

Key words: Iron-based ionic liquid, Carbon dioxide, Henry coefficient, Absorption, Aprotic solvent

CLC Number:

O645

TrendMD:

CUI Wei, ZHAO Deyin, BAI Wenxuan, ZHANG Xiaodong, YU Jiang. CO₂ Absorption in Composite of Aprotic Solvent and Iron-based Ionic Liquid[J]. Chem. J. Chinese Universities, 2022, 43(8): 20220120.

Figures/Tables 9

Table 1 Henry coefficients of CO2 in BmimFeCl4 and solvent mixture at different temperatures

System	$ω 1$	$H T, P$ /（MPa·L·mol^-1）
System	$ω 1$	298.2 K	313.2 K	328.2 K
BmimFeCl₄/DMAC	1.0	1.5174	2.5223	3.9806
	0.9	1.2774	2.1307	3.4041
	0.7	0.9181	1.6624	2.6338
	0.5	0.8093	1.2356	1.6342
	0.0	0.5167	0.7724	1.1009
BmimFeCl₄/NHD	1.0	1.5174	2.5223	3.9806
	0.9	1.3801	2.2273	3.5618
	0.7	0.9912	1.7611	2.8500
	0.5	0.8936	1.5338	2.2457
	0.0	0.6254	0.9705	1.2254

Table 1 Henry coefficients of CO2 in BmimFeCl4 and solvent mixture at different temperatures

System	$ω 1$	$H T, P$ /（MPa·L·mol^-1）
System	$ω 1$	298.2 K	313.2 K	328.2 K
BmimFeCl₄/DMAC	1.0	1.5174	2.5223	3.9806
	0.9	1.2774	2.1307	3.4041
	0.7	0.9181	1.6624	2.6338
	0.5	0.8093	1.2356	1.6342
	0.0	0.5167	0.7724	1.1009
BmimFeCl₄/NHD	1.0	1.5174	2.5223	3.9806
	0.9	1.3801	2.2273	3.5618
	0.7	0.9912	1.7611	2.8500
	0.5	0.8936	1.5338	2.2457
	0.0	0.6254	0.9705	1.2254

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CO₂ Absorption in Composite of Aprotic Solvent and Iron-based Ionic Liquid

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