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Screening of ionic liquids to capture CO 2 by COSMO‐RS and experiments
Author(s) -
Zhang Xiaochun,
Liu Zhiping,
Wang Wenchuan
Publication year - 2008
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.11573
Subject(s) - ionic liquid , gravimetric analysis , solubility , chemistry , imide , cosmo rs , ion , inorganic chemistry , organic chemistry , catalysis
A screening method is proposed for the molecular design of ionic liquids (ILs) to capture carbon dioxide (CO 2 ), which can reduce efficiently the necessary experimental efforts. The COSMO‐RS method is implemented to predict the Henry's law constants of CO 2 in 408 ILs with various combinations of cations and anions. It is found by the screening that the ILs with the anion tris(pentafluoroethyl)trifluorophosphate ([FEP]) show improved capability to capture CO 2 , compared with other ILs reported in literature. Then, three [FEP]‐based ILs are chosen to perform the solubility measurements by the intelligent gravimetric analyzer (IGA 003, Hiden Analytical), with cations of 1‐hexyl‐3‐methylimidazolium ([hmim]), 1‐butyl‐1‐methylpyrrolidinium ([bmpyrr]), and S‐ethyl‐ N , N , N ′, N ′‐tetramethylthiouronium ([ETT]) at 283.2, 298.2, and 323.2 K, up to the pressure of 1.8 MPa. The experimental data show that the solubility of CO 2 in [hmim][FEP] is about 15% higher than that in 1‐hexyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide ([hmim][Tf 2 N]), which is in fair agreement with the screening results, indicating the method proposed in this work is reliable. © 2008 American Institute of Chemical Engineers AIChE J, 2008