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Journal of Chemical & Engineering Data Article Figure 7. Enthalpy of CO2 absorption in (ChCl/urea + water) at 308.2 K. solubility is not significant compared to its influence on the viscosity. The excess molar volumes and excess molar activation energy were further calculated from the experimental density and viscosity. NRTL-RK was used to represent the CO2 solubility in ChCl/urea with water, and the CO2 absorption enthalpy was further calculated and analyzed. The CO2 absorption enthalpy in ChCl/urea + water is dominated by the enthalpy of CO2 dissolution, and the magnitude of enthalpy for CO2 dissolution d■ecreases with increasing water content. AUTHOR INFORMATION Corresponding Authors *E-mail: yujiao.xie@ltu.se. *E-mail: xiaoyan.ji@ltu.se. Funding We would like to thank the Interreg IVA North programme, the County Administrative Board of Norrbotten Sate in Sweden, Swedish Research Council in Sweden and the Petrochemical Joint Funds of NSFC-CNPC (U1162105) in China for financial support. Notes The authors declare no competing financial interest. ■ REFERENCES (1) Yu, C.; Huang, C.; Tan, C. A review of CO2 capture by absorption and adsorption. Aerosol Air Qual. Res. 2012, 12, 745−769. (2) Gough, C.; Upham, P. Biomass energy with carbon capture and storage (BECCS or Bio-CCS). Greenhouse Gases: Sci. Technol. 2011, 1, 324−334. (3) Yang, H.; Xu, Z.; Fan, M.; Gupta, R.; Slimane, R. B.; Bland, A. E.; Wright, I. Progress in carbon dioxide separation and capture: A review. J. Environ. Sci. 2008, 20, 14−27. (4) Quick, D. http://www.gizmag.com/ionic-liquid-co2-emissions- control/11105/ (accessed August 2014). (5) Ramdin, M.; Loos, T.; Vlugt, T. State-of-the-Art of CO2 capture with ionic liquids. Ind. Eng. Chem. Res. 2012, 51, 8149−8177. (6) Lu, X.; Ji, Y.; Feng, X.; Ji, X. Methodology of non-equilibrium thermodynamics for kinetics research of CO2 capture by ionic liquids. Sci. China Chem. 2012, 55, 1079−1091. (7) Zhang, Q.; Vigier, K.; Royer, S. Deep eutectic solvents: syntheses, properties and applications. Chem. Soc. Rev. 2012, 41, 7108−7146. (8) Zhang, Y.; Lu, X.; Xin, F.; Shi, Y.; Ji, X. Properties and applications of choline-based deep eutectic solvents. Prog. Chem. 2013, 25, 881−892. (9) Abbott, A. P.; Capper, G.; Davies, D. L.; Rasheed, R. K.; Tambyrajah, V. Novel solvent properties of choline chloride/urea mixtures. Chem. Commun. 2003, 1, 70−71. (10) Li, X.; Hou, M.; Han, B.; Wang, X.; Zou, L. Solubility of CO2 in a choline chloride + urea eutectic mixture. J. Chem. Eng. Data 2008, 53, 548−550. (11) Leron, R.; Li, M. Solubility of carbon dioxide in a choline chloride-ethylene glycol based deep eutectic solvent. Thermochim. Acta 2013, 551, 14−19. (12) Wu, S.; Caparanga, A.; Leron, R.; Li, M. Vapor pressure of aqueous choline chloride-based deep eutectic solvents (ethaline, glyceline, maline and reline) at 30 - 70 °C. Thermochimi. Acta 2012, 544, 1−5. (13) Leron, R.; Li, M. Molar heat capacities of choline chloride-based deep eutectic solvents and their binary mixtures with water. Thermochim. Acta 2012, 530, 52−57. (14) Leron, R.; Wong, D.; Li, M. Density of a deep eutectic solvent based on choline chloride and glycerol and its aqueous mixtures at elevated pressures. Fluid Phase Equilib. 2012, 335, 32−38. (15) Hsieh, Y.; Leron, R.; Soriano, A.; Caparanga, A. R.; Li, M. Diffusivity, density and viscosity of aqueous solutions of choline chloride/ethylene glycol and choline chloride/malonic acid. J. Chem. Eng. Jpn. 2012, 45, 939−947. (16) Zhang, J.; Jia, C.; Dong, H.; Wang, J.; Zhang, X.; Zhang, S. A novel dual amino-functionalized cation-tethered ionic liquid for CO2 capture. Ind. Eng. Chem. Res. 2013, 52, 5835−5841. (17) Ciocirlan, O.; Iulian, O.; Croitoru, O. Effect of temperature on the physico-chemical properties of three ionic liquids containing choline chloride. Rev. Chim. 2010, 61, 721−723. (18) Yadav, A.; Pandey, S. Densities and Viscosities of (Choline Chloride+ Urea) Deep Eutectic Solvent and Its Aqueous Mixtures in the Temperature Range 293.15 to 363.15 K. J. Chem. Eng. Data 2014, 59, 2221−2229. (19) Su, W.; Wong, D.; Li, M. Effect of water on solubility of carbon dioxide in (aminomethanamide+ 2-hydroxy-N, N, N-trimethylethana- minium chloride). J. Chem. Eng. Data 2009, 54, 1951−1955. (20) Leron, R.; Li, M. High-pressure density measurements for choline chloride: Urea deep eutectic solvent and its aqueous mixtures at T = (298.15 to 323.15) K and up to 50 MPa. J. Chem. Thermodyn. 2012, 54, 293−301. 3351 dx.doi.org/10.1021/je500320c | J. Chem. Eng. Data 2014, 59, 3344−3352PDF Image | CO2 Separation with Ionic Liquids
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