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Improving Physical Absorption of Carbon Dioxide by Ionic Liquid Dispersion
Author(s) -
Liu H.,
Tian H.,
Yao H.,
Yu D.,
Zhao W.,
Bai X.
Publication year - 2013
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201300077
Subject(s) - mass transfer , absorption (acoustics) , ionic liquid , mass transfer coefficient , carbon dioxide , emulsion , chemistry , dispersion (optics) , aqueous solution , pulmonary surfactant , chemical engineering , analytical chemistry (journal) , chromatography , materials science , organic chemistry , catalysis , biochemistry , physics , optics , composite material , engineering
Abstract An ionic liquid (IL), 1‐butylimidazole hexafluoride phosphate [bmim]PF 4 , was dispersed in surfactant solution to form an IL‐in‐water emulsion. Physical absorption of CO 2 was carried out in this emulsion system. Absorption rates of CO 2 under different operating conditions were obtained by experimental measurements. CO 2 concentrations in the bulk of absorbent and the local volumetric mass transfer coefficients of the liquid phase were calculated by model calculation. Experimental results indicate that the dispersed IL droplets in aqueous solution can significantly enhance CO 2 mass transfer at the gas‐liquid interface. This phenomenon can be ascribed to the increase of mass transfer driving force and local volumetric mass transfer coefficient. The shuttle effect and hydrodynamic effect proved to play important roles for CO 2 absorption improved by dispersed IL.