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Received October 29, 2015
Accepted December 2, 2015
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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
School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea 1Offshore Plant Resources R&D Center, Korea Institute of Industrial Technology, Busan 46749, Korea
Korean Journal of Chemical Engineering, April 2016, 33(4), 1425-1430(6), 10.1007/s11814-015-0268-7
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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 (LW) - 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 (ΔHd) 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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Park S, Lee S, Lee Y, Seo Y, Environ. Sci. Technol., 47, 7571 (2013)
Han S, Shin JY, Rhee YW, Kang SP, Desalination, 354, 17 (2014)
Lee Y, Kim Y, Seo Y, Environ. Sci. Technol., 49, 8899 (2015)
Kim S, Kang SP, Seo Y, Chem. Eng. J., 276, 205 (2015)
Lee H, Ryu H, Lim JH, Kim JO, Lee JD, Kim S, Desalin. Water Treat., DOI:10.1080/19443994.2015.1049405. (2015)
Cha JH, Seol Y, ACS Sustainable Chem. Eng., 1, 1218 (2013)
Seo Y, Tajima H, Yamasaki A, Takeya S, Ebinuma T, Kiyono F, Environ. Sci. Technol., 38, 4635 (2004)
Cha I, Lee S, Lee JD, Lee GW, Seo Y, Environ. Sci. Technol., 44, 6117 (2010)
Seo Y, Moon D, Lee C, Park JW, Kim BS, Lee GW, Dotel P, Lee JW, Cha M, Yoon JH, Environ. Sci. Technol., 49, 6045 (2015)
Liang D, Guo K, Wang R, Fan S, Fluid Phase Equilib., 187, 61 (2001)
Akiya T, Shimazaki T, Oowa M, Matsuo M, Yoshida Y, Int. J. Therm., 20, 1753 (1999)
Hashimoto S, Makino T, Inoue Y, Ohgaki K, J. Chem. Eng. Data, 55(11), 4951 (2010)
Takeya S, Hori A, Hondoh T, Uchida T, J. Phys. Chem. B, 104(17), 4164 (2000)
Buchanan P, Soper AK, Thompson H, Westacott RE, Creek JL, Hobson G, Koh CA, J. Chem. Phys., 123, 164507 (2005)
Hakvoort G, J. Therm. Anal. Calorim., 41, 1551 (1994)
Gupta A, Lachance J, Sloan ED, Koh CA, Chem. Eng. Sci., 63(24), 5848 (2008)
Seo Y, Lee H, J. Phys. Chem. B, 106(37), 9668 (2002)
Lee S, Lee Y, Park S, Kim Y, Lee JD, Seo Y, J. Phys. Chem. B, 116, 9075 (2012)
Lee S, Lee Y, Lee J, Lee H, Seo Y, Environ. Sci. Technol., 47, 13184 (2013)
Lee Y, Lee S, Lee J, Seo Y, Chem. Eng. J., 246, 20 (2014)
Lee Y, Kim Y, Lee J, Lee H, Seo Y, Appl. Energy, 150, 120 (2015)
Sugahara T, Murayama S, Hashimoto S, Ohgaki K, Fluid Phase Equilib., 233(2), 190 (2005)
Mohammadi AH, Anderson R, Tohidi B, AIChE J., 51(10), 2825 (2005)
Uchida T, Ohmura R, Ikeda IY, Nagao J, Takeya S, Hori A, J. Phys. Chem. B, 110(10), 4583 (2006)
Kang SP, Lee JW, Ryu HJ, Fluid Phase Equilib., 274(1-2), 68 (2008)
Seo Y, Kang SP, Lee S, Lee H, J. Chem. Eng. Data, 53(12), 2833 (2008)
Lee S, Lee Y, Park S, Seo Y, J. Chem. Eng. Data, 55(12), 5883 (2010)
Tohidi B, Burgass R, Danesh A, Ostergaard K, Todd A, Ann. N.Y. Acad. Sci., 912, 924 (2000)
Mohammad-Taheri M, Moghaddam AZ, Nazari K, Zanjani NG, Fluid Phase Equilib., 338, 257 (2013)
Cha M, Hu Y, Sum AK, Fluid Phase Equilib., In Press (2015).
Dalmazzone D, Kharrat M, Lachet V, Fouconnier B, Clausse D, J. Therm. Anal. Calorim., 70, 493 (2002)
Lee S, Park S, Lee Y, Lee J, Lee H, Seo Y, Langmuir, 27(17), 10597 (2011)
Lafond PG, Olcott KA, Sloan ED, Koh CA, Sum AK, J. Chem. Thermodyn., 48, 1 (2012)
Lin W, Dalmazzone D, Furst W, Delahaye A, Fournaison L, Clain P, J. Chem. Thermodyn., 61, 132 (2013)
Lee S, Seo Y, Energy Fuels, 24, 6074 (2010)
