Solubility behavior of CO2 and H2S in 1-benzyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquid. (April 2022)

• Record Type: Journal Article
• Authors: Jalili, Amir H.; Mehdizadeh, Ali; Ahmadi, Amir N.; Zoghi, Ali T.; Shokouhi, Mohammad
• Is Part Of: Journal of chemical thermodynamics. Volume 167(2022)
• Publication Date: 2022-04
• Subjects: Room temperature ionic liquid -- Physical absorption -- Gas-liquid equilibria -- Acid gas -- Gas absorption -- Carbon dioxide capture -- Hydrogen sulfide -- Natural gas sweetening; Thermodynamics -- Periodicals; Thermochemistry -- Periodicals; Thermodynamique -- Périodiques; Thermochimie -- Périodiques; Thermochemistry; Thermodynamics; Periodicals; 541.369
• DOI: 10.1016/j.jct.2021.106721
• Languages: English
• ISSNs: 0021-9614

Abstract

Graphical abstract: Highlights: Measurement solubility of CO2 and H2 S in the ionic liquid [Bzmim][Tf2 N]. Simultaneous measurement of molar volume of CO2 / H2 S saturated [Bzmim][Tf2 N]. Evaluation of Henry's constants for solubility of CO2 and H2 S in [Bzmim][Tf2 N]. Correlation of experimental data by the Pitzer's model and Generic Redlich-Kwong EoS. Solubility of CO2 /H2 S in [Bzmim][Tf2 N] is compared with [C n mim][Tf2 N] at molecular level. Abstract: The solubility of CO2 and H2 S in 1-benzyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([Bzmim][Tf2 N]) ionic liquid has been measured at temperatures from (303.15 to 343.15) K and pressures of up to about 3.1 and 1.6 MPa, respectively. The molar volume of the gas saturated liquid phase has also been measured. It was found that the solubility of H2 S in [Bzmim][Tf2 N] is>2 times that of CO2 . Henry's constants, partial molar volumes and partial molar thermodynamic functions at infinite dilution for dissolution of CO2 and H2 S in [Bzmim][Tf2 N] were evaluated from the experimental data. The experimental data was correlated using the extended Henry's law combined with a simplified Pitzer's model. The experimental data was further correlated by a generic Redlich-Kwong equation of state (GRK EoS). Both models show quite good correlative accuracy for CO2 /H2 S + [Bzmim][Tf2 N] mixtures. However, the former model was superior to that of the GRK EoS for H2 S + [Bzmim][Tf2 N].