Screening ionic liquids as candidates for separation of acid gases: Solubility of hydrogen sulfide, methane, and ethane. Issue 8 (28th March 2013)

• Record Type: Journal Article
• Authors: Mortazavi‐Manesh, Soheil; Satyro, Marco A.; Marriott, Robert A.
• Is Part Of: AIChE journal. Volume 59:Issue 8(2013:Aug.)
• Page Start: 2993
• Page End: 3005
• Publication Date: 2013-03-28
• Subjects: gas treatment -- ionic liquids -- Henry's constant -- selectivity -- conductor‐like screening model for realistic solvation; Chemical engineering -- Periodicals; Génie chimique -- Périodiques; 660.28
• DOI: 10.1002/aic.14081
• Languages: English
• ISSNs: 0001-1541

Abstract

Abstract : 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 H2 S, CH4, and C2 H6 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 H2 S over CH4 and C2 H6 . The best 15% (58) of promising ILs for sour gas treatment predominantly contain the anions BF4, NO3, and CH3 SO4 and the cations N4111, pmg, and tmg. © 2013 American Institute of Chemical Engineers AIChE J, 59: 2993–3005, 2013