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Vapor-liquid equilibria of ammonia + ionic liquid mixtures

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  • Yokozeki, A.
  • Shiflett, Mark B.

Abstract

Solubilities of ammonia in room-temperature ionic liquids, 1-ethyl-3-methylimidazolium acetate, 1-ethyl-3-methylimidazolium thiocyanate, 1-ethyl-3-methylimidazolium ethylsulfate, and N,N-dimethylethanolammonium acetate have been measured for the first time. Static phase equilibrium cells used in our previous work have been slightly modified for the present solubility measurements. Six mixture compositions of each binary system were prepared for the present experiments from about 30 to 85 mol% of ammonia. Pressure-temperature-composition (PTx) data were measured at isothermal conditions of about 283, 298, 323, 348, and 373 K. Observed solubilities in the present ionic liquids are again very high, being similar to our previous report on ammonia + ionic liquid mixtures and all cases show negative deviations from ideal solution behavior. Experimental PTx data have been successfully correlated with our equation-of-state (EOS) model. All the excess properties (enthalpy, entropy, and Gibbs energy) show negative values, indicating some intermolecular complex formation between ammonia and ionic liquids. Application of the present systems to the absorption cooling-heating cycle has also been discussed.

Suggested Citation

  • Yokozeki, A. & Shiflett, Mark B., 2007. "Vapor-liquid equilibria of ammonia + ionic liquid mixtures," Applied Energy, Elsevier, vol. 84(12), pages 1258-1273, December.
    • Handle: RePEc:eee:appene:v:84:y:2007:i:12:p:1258-1273
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    References listed on IDEAS

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    1. Yokozeki, A., 2005. "Theoretical performances of various refrigerant-absorbent pairs in a vapor-absorption refrigeration cycle by the use of equations of state," Applied Energy, Elsevier, vol. 80(4), pages 383-399, April.
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    2. Wang, Fu & Zhao, Jun & Miao, He & Zhao, Jiapei & Zhang, Houcheng & Yuan, Jinliang & Yan, Jinyue, 2018. "Current status and challenges of the ammonia escape inhibition technologies in ammonia-based CO2 capture process," Applied Energy, Elsevier, vol. 230(C), pages 734-749.
    3. Wang, Meng & Infante Ferreira, Carlos A., 2017. "Absorption heat pump cycles with NH3 – ionic liquid working pairs," Applied Energy, Elsevier, vol. 204(C), pages 819-830.
    4. Asfand, Faisal & Bourouis, Mahmoud, 2015. "A review of membrane contactors applied in absorption refrigeration systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 45(C), pages 173-191.
    5. Sujatha, I. & Venkatarathnam, G., 2017. "Performance of a vapour absorption heat transformer operating with ionic liquids and ammonia," Energy, Elsevier, vol. 141(C), pages 924-936.
    6. Chen, Wei & Xu, Chenbin & Wu, Haibo & Bai, Yang & Li, Zoulu & Zhang, Bin, 2020. "Energy and exergy analyses of a novel hybrid system consisting of a phosphoric acid fuel cell and a triple-effect compression–absorption refrigerator with [mmim]DMP/CH3OH as working fluid," Energy, Elsevier, vol. 195(C).
    7. Chen, Wei & Bai, Yang, 2016. "Thermal performance of an absorption-refrigeration system with [emim]Cu2Cl5/NH3 as working fluid," Energy, Elsevier, vol. 112(C), pages 332-341.
    8. Dong, Li & Zheng, Danxing & Nie, Nan & Li, Yun, 2012. "Performance prediction of absorption refrigeration cycle based on the measurements of vapor pressure and heat capacity of H2O+[DMIM]DMP system," Applied Energy, Elsevier, vol. 98(C), pages 326-332.

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