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Gas–liquid mass‐transfer properties in CO 2 absorption system with ionic liquids
Author(s) -
Zhang Xin,
Bao Di,
Huang Ying,
Dong Haifeng,
Zhang Xiangping,
Zhang Suojiang
Publication year - 2014
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.14507
Subject(s) - ionic liquid , mass transfer , chemistry , absorption (acoustics) , viscosity , kinetics , mass fraction , analytical chemistry (journal) , chemical engineering , thermodynamics , chromatography , organic chemistry , materials science , catalysis , physics , quantum mechanics , engineering , composite material
The deficiency of mass‐transfer properties in ionic liquids (ILs) has become a bottleneck in developing the novel IL‐based CO 2 capture processes. In this study, the liquid‐side mass‐transfer coefficients (k L ) were measured systematically in a stirred cell reactor by the decreasing pressure method at temperatures ranging from 303 to 323 K and over a wide range of IL concentrations from 0 to 100 wt %. Based on the data of k L , the kinetics of chemical absorption of CO 2 with mixed solvents containing 30 wt % monoethanolamine (MEA) and 0–70 wt % ILs were investigated. The k L in IL systems is influenced not only by the viscosity but also the molecular structures of ILs. The enhancement factors and the reaction activation energy were quantified. Considering both the mass‐transfer rates and the stability of IL in CO 2 absorption system, the new IL‐based system MEA + [bmim][NO 3 ] + H 2 O is recommended. © 2014 American Institute of Chemical Engineers AIChE J , 60: 2929–2939, 2014