Equation of state for the systems containing aqueous salt: Prediction of high pressure vapor-liquid equilibrium

Hadi Baseri; Mohammad Nader Lotfollahi; Ali Haghighi Asl

Korean Journal of Chemical Engineering, Vol.26, No.1, 168-174, January, 2009

DOI10.1007/s11814-009-0028-7 Export Citation

Equation of state for the systems containing aqueous salt: Prediction of high pressure vapor-liquid equilibrium

Hadi Baseri, Mohammad Nader Lotfollahi, and Ali Haghighi Asl^†

Chemical Engineering Department, Semnan University, Semnan, Iran

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An equation of state (EOS), which is based upon contributions to the Helmholtz energy, is presented for systems containing aqueous electrolyte solutions at high pressure. The Peng-Robinson equation of state is used to provide the Helmholtz energy of a reference system. The electrolyte terms consist three terms containing a modified Debye-Huckel term for long-range electrostatic interactions, the Born energy contribution for electrostatic works and a Margules term for short-range electrostatic interactions between ions and solvents. The binary and ternary interaction parameters of the equation of state are obtained by experimental osmotic coefficient data. Systems that were studied here are (water+NaCl+SC-CO2), (water+NH4Cl+SC-CO2), (water+Na2SO4+SC-CO2) and (water+methanol+NaCl+SC-CO2). It is found that the proposed equation of state is able to accurately represent the experimental data over a wide range of pressure, temperature and salt concentration.

Keywords:Equation of State;Electrolyte Solution;Vapor-liquid Equilibrium

[References]

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[2] Prutton CF, Savage RL, J. Am. Chem. Soc., 67, 1550 (1945)

[3] Sander B, Fredenslund A, Rasmussen P, Chemical Engineering Science, 41, 1171 (1986)

[4] Mock B, Evans L, Chen CC, AIChE J., 32, 1655 (1986)

[5] Macedo EA, Skovborg P, Rasmussen P, Chemical Engineering Science, 45, 875 (1990)

[6] Kikic L, Fermeglia, Rasmussen MP, Chemical Engineering Science, 46, 2775 (1990)

[7] Polka HM, Li JD, Gmehling J, Fluid Phase Equilib., 94, 115 (1994)

[8] Clarke MA, Bishnoi PR, Fluid Phase Equilib., 220(1), 21 (2004)

[9] Raatschen W, Harvey AH, Prausnitz JM, Fluid Phase Equilibria, 38, 19 (1987)

[10] Harvey AH, Prausnitz JM, AIChE J., 35, 635 (1989)

[11] Sieder G, Maurer G, Fluid Phase Equilib., 225(1-2), 85 (2004)

[12] Liu WB, Li YG, Lu JF, Fluid Phase Equilibria, 158-160, 595 (1999)

[13] Zuo YX, Guo TM, Chem. Eng. Sci., 46, 3251 (1991)

[14] Patel NC, Teja AA, Chem. Eng. Sci., 37, 463 (1982)

[15] Lu GW, Li CX, Tian R, Wang ZH, Wang WC, Fluid Phase Equilib., 218(1), 77 (2004)

[16] Collinet E, Gmehling J, Fluid Phase Equilib., 246(1-2), 111 (2006)

[17] Furst W, Renon H, AIChE J., 39, 335 (1993)

[18] Sun TF, Bullock KR, Teja AS, Fluid Phase Equilib., 219(2), 257 (2004)

[19] Bermejo MD, Martin A, Florusse LJ, Peters CJ, Cocero MJ, Fluid Phase Equilib., 238(2), 220 (2005)

[20] Evans K, Powell R, Geochimica et Cosmochimica Acta., 70, 5488 (2006)

[21] Melhem GA, Saini R, Leibovici CF, Fluid Phase Equilibria, 47, 189 (1989)

[22] Panagiotopoulos AZ, Reid DB, Fluid Phase Equilibria, 29, 525 (1986)

[23] Gao GH, Shi HB, Yu YX, Fluid Phase Equilib., 256(1-2), 105 (2007)

[24] Pitzer KS, J. Phys. Chem., 77, 268 (1973)

[25] Prausnitz JM, Lichtenthaler RN, de Azevedo EG, Molecular thermodynamics of fluid phase equilibria, Third edition, Prentice-Hall, Inc. (1999)

[26] Deyhimi F, Ghalami-Choobar B, Fluid Phase Equilib., 246(1-2), 185 (2006)

[27] El Guendouzi M, Mounir A, Dinane A, J. Chem. Thermodyn., 35(2), 209 (2003)

[28] Nighswander JA, Karlogerakis N, Mehrotra AK, J. Chem. Eng. Data, 34, 356 (1989)