화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.26, No.6, 1733-1747, November, 2009
DOI10.1007/s11814-009-0286-4  Export Citation
Modeling of aqueous electrolyte solutions based on perturbed-chain statistical associating fluid theory incorporated with primitive mean spherical approximation
Bong-Seop Lee, and Ki-Chang Kim†
  • Department of Chemical Engineering, College of Engineering, Kangwon National University, 192-1, Hyoja-2 dong, Chuncheon 200-701, Korea
E-mail:
In this work an equation of state applicable to the system containing electrolytes has been developed by coupling the perturbed chain statistical associating fluid theory (PC-SAFT) with the primitive mean spherical approximation. The resulting electrolyte equation of state is characterized by 4 ion parameters for each of the cation and anion contained in aqueous solutions, and 4 ion specific parameters for each of six cations (Li+, Na+, K+, Rb+, Mg2+ and Ca2+) and six anions (Cl-, Br-, I-, HCO-3, NO-3 and SO^(2-)4) were estimated, based upon the individual ion approach, from the fitting of experimental densities and mean ionic activity coefficients of 26 aqueous single-salt solutions at 298.15 K and 1 bar. The present equation of state with the estimated individual ion parameters has been found to satisfactorily describe not only the densities and mean ionic activity coefficients, but also osmotic coefficients and water activities of single-salt aqueous solutions. Furthermore, the present model was extended to two-salt aqueous solutions, and it has been found that thermodynamic properties such as mentioned above, of two-salt solutions, can be well predicted with the present model, without any additional adjustable parameters.
Keywords:Electrolyte;Electrolyte Equation of State;Individual Ion Parameters;PC-SAFT;Primitive Mean Spherical Approximation
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