Premium
UNIFAC model for ionic liquid‐CO (H 2 ) systems: An experimental and modeling study on gas solubility
Author(s) -
Lei Zhigang,
Dai Chengna,
Yang Qian,
Zhu Jiqin,
Chen Biaohua
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.14606
Subject(s) - unifac , solubility , ionic liquid , group contribution method , chemistry , thermodynamics , activity coefficient , work (physics) , selectivity , phase equilibrium , aqueous solution , organic chemistry , catalysis , phase (matter) , physics
The universal quasichemical functional‐group activity coefficients (UNIFAC) model for ionic liquids (ILs) has become notably popular because of its simplicity and availability via modern process simulation softwares. In this work, new group binary interaction parameters (α mn and α nm ) between CO (H 2 ) and IL groups were obtained by correlating the solubility data in pure ILs at high temperatures (above 273.2 K) collected from the literature. the solubility of CO in [BMIM] + [BF 4 ] − , [OMIM] + [BF 4 ] − , [OMIM] + [Tf 2 N] − , and their mixtures, as well as that of H 2 in [EMIM] + [BF 4 ] − , [BMIM] + [BF 4 ] − , [OMIM] + [Tf 2 N] − , and their mixtures, at temperatures from 243.2 to 333.2 K and pressures up to 6.0 MPa were measured. The UNIFAC model was observed to well predict the solubility in pure and mixed ILs at both high (above 273.2 K) and low (below 273.2 K) temperatures. Moreover, the selectivity of CO (or H 2 ) to CO 2 in ILs increases with decreasing temperature, indicating that low temperatures favor for gas separation. © 2014 American Institute of Chemical Engineers AIChE J 60: 4222–4231, 2014