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Screening ionic liquids as candidates for separation of acid gases: Solubility of hydrogen sulfide, methane, and ethane
Author(s) -
MortazaviManesh Soheil,
Satyro Marco A.,
Marriott Robert A.
Publication year - 2013
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.14081
Subject(s) - solubility , chemistry , methane , hydrogen sulfide , ionic liquid , acid gas , solvation , natural gas , sour gas , selectivity , hydrogen , absorption (acoustics) , inorganic chemistry , thermodynamics , organic chemistry , ion , materials science , sulfur , catalysis , physics , composite material
The solubility of the major constituents of natural gas in ionic liquids (ILs) can be used to identify their potential for acid gas removal from a producing gas stream. We have developed models for the solubility of H 2 S, CH 4 , and C 2 H 6 in ILs at typical conditions encountered in natural gas treatment. In this work, a conductor‐like screening model for realistic solvation was used to predict the activity coefficients for solutes in ILs and a cubic EOS was used for vapor‐phase corrections from ideality. Empirical correlations were developed to extrapolate solubilities where experimental data are not available at desired conditions; targeted in this study at 298.15 K and 2000 kPa. Over 400 possible ILs were ranked based on the higher selectivity of absorption of CO 2 and H 2 S over CH 4 and C 2 H 6 . The best 15% (58) of promising ILs for sour gas treatment predominantly contain the anions BF 4 , NO 3 , and CH 3 SO 4 and the cations N 4111 , pmg, and tmg. © 2013 American Institute of Chemical Engineers AIChE J , 59: 2993–3005, 2013