Phase equilibrium of (CO2 + 1-aminopropyl-3-methylimidazolium bromide + water) electrolyte system and effects of aqueous medium on CO2 solubility: Experiment and modeling. (April 2017)

• Record Type: Journal Article
• Authors: Chen, Ying; Guo, Kaihua; Bi, Yin; Zhou, Lan
• Is Part Of: Journal of chemical thermodynamics. Volume 107(2017)
• Page Start: 65
• Page End: 78
• Publication Date: 2017-04
• Subjects: CO2 solubility -- Phase equilibrium -- Modified eNRTL model -- Ionic liquid -- Aqueous medium; Thermodynamics -- Periodicals; Thermochemistry -- Periodicals; Thermodynamique -- Périodiques; Thermochimie -- Périodiques; Thermochemistry; Thermodynamics; Periodicals; 541.369
• DOI: 10.1016/j.jct.2016.12.024
• Languages: English
• ISSNs: 0021-9614

Abstract

Graphical abstract: Highlights: Phase and chemical equilibrium data for (CO2 + [APMIm]Br + H2 O) electrolyte system. A modified eNRTL model for CO2 solubility in the amino-based IL aqueous solution. Effects of aqueous medium on both chemical and physical dissolution of CO2 . The correlative coefficient, Rs ∗, for the Henry's constant of the solution. New parameters for the segments interaction and the chemical equilibrium constants. Abstract: New experimental data for solubility of carbon dioxide (CO2 ) in the aqueous solution of 1-aminopropyl-3-methylimidazolium bromide ([APMIm]Br) with four different water mass fractions (0.559, 0.645, 0.765 and 0.858) at T = (278.15–348.15) K with an interval of T = 10 K and p = (0.1237–6.9143) MPa were presented. The electrolyte nonrandom two-liquid (eNRTL) model was modified to be applicable for an ionic liquid (IL) aqueous solution system, by introducing an idle factor β to illustrate the association effect of IL molecules. A solution Henry's constant for CO2 solubility in the IL aqueous solution was defined by introducing a correlative coefficient Rs ∗ . The vapor-liquid phase equilibrium of the [APMIm]Br-H2 O-CO2 ternary system was successfully calculated with the modified eNRTL model. The chemical and physical mechanisms for the ionized CO2 formation and the molecular CO2 dissolved in the solution were identified. The effects of aqueous medium on both chemical and physical dissolution of CO2 in the [APMIm]Br aqueous solution were studied, and a considerable enhancement of the solubility of CO2 with increase of the water content in the solution was observed.