Screening Ionic Liquids as Candidates for Separation of Acid
Gases: Solubility of Hydrogen Sulfide, Methane, and Ethane
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 H2S, CH4, and C2H6 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 CO2 and H2S over CH4 and C2H6. The best 15% (58) of promising ILs
for sour gas treatment predominantly contain the anions BF4, NO3, and CH3SO4 and the cations N4111, pmg, and tmg.
VC 2013 American Institute of Chemical Engineers AIChE J, 59: 2993–3005, 2013
Keywords: gas treatment, ionic liquids, Henry’s constant, selectivity, conductor-like screening model for realistic
solvation
دریافت
عنوان: Screening Ionic Liquids as Candidates for Separation of Acid
حجم: 692 کیلوبایت