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Accurate measurement of phase equilibria and dissociation enthalpies of HFC-134a hydrates in the presence of NaCl for potential application in desalination

  • Separation Technology, Thermodynamics
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Abstract

Phase equilibria, structure identification, and dissociation enthalpies of HFC-134a hydrates in the presence of NaCl are investigated for potential application in desalination. To verify the influence of NaCl on the thermodynamic hydrate stability of the HFC-134a hydrate, the three-phase (hydrate (H) - liquid water (L W ) - vapor (V)) equilibria of the HFC-134a+NaCl (0, 3.5, and 8.0 wt%)+water systems are measured by both a conventional isochoric (pVT) method and a stepwise differential scanning calorimeter (DSC) method. Both pVT and DSC methods demonstrate reliable and consistent hydrate phase equilibrium points of the HFC-134a hydrates in the presence of NaCl. The HFC-134a hydrate is identified as sII via powder X-ray diffraction. The dissociation enthalpies (ΔH d ) of the HFC-134a hydrates in the presence of NaCl are also measured with a high pressure micro-differential scanning calorimeter. The salinity results in significant thermodynamic inhibition of the HFC-134a hydrates, whereas it has little effect on the dissociation enthalpy of the HFC-134a hydrates. The experimental results obtained in this study can be utilized as foundational data for the hydrate-based desalination process.

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Authors and Affiliations

  1. School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, Ulsan, 44919, Korea

    Dongyoung Lee, Yohan Lee, Seungmin Lee & Yongwon Seo

  2. Offshore Plant Resources R&D Center, Korea Institute of Industrial Technology, Busan, 46749, Korea

    Seungmin Lee

Authors
  1. Dongyoung Lee
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  2. Yohan Lee
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  3. Seungmin Lee
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  4. Yongwon Seo
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Correspondence to Yongwon Seo.

Additional information

This article is dedicated to Prof. Huen Lee on the occasion of his retirement from KAIST.

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Lee, D., Lee, Y., Lee, S. et al. Accurate measurement of phase equilibria and dissociation enthalpies of HFC-134a hydrates in the presence of NaCl for potential application in desalination. Korean J. Chem. Eng. 33, 1425–1430 (2016). https://doi.org/10.1007/s11814-015-0268-7

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  • DOI: https://doi.org/10.1007/s11814-015-0268-7

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