TY - JOUR
T1 - Thermodynamic representation of aqueous sodium nitrate and nitric acid solution with electrolyte NRTL model
AU - Wang, Meng
AU - Gorensek, Maximilian B.
AU - Chen, Chau Chyun
N1 - Funding Information:
The authors gratefully acknowledge the financial support of the Jack Maddox Distinguished Engineering Chair Professorship in Sustainable Energy sponsored by the J. F Maddox Foundation. The work is partially supported by a grant from Savannah River Nuclear Solutions, LLC (Subcontract No. 0000158190).
Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2015/3/12
Y1 - 2015/3/12
N2 - Nitric acid solution has been widely used in nuclear waste treatment processes. To support heat and mass balance calculations and process simulation, a comprehensive thermodynamic model is developed for sodium nitrate-water binary, nitric acid-water binary, and nitric-acid-sodium nitrate-water ternary systems. Based on symmetric electrolyte NRTL (eNRTL) activity coefficient model, the present work takes into account complete dissociation of sodium nitrate and partial dissociation of nitric acid in aqueous solution. With up to three temperature coefficients for each eNRTL binary interaction parameter, the model provides an accurate and thermodynamically consistent representation for phase equilibrium properties such as vapor pressure, boiling point, dew point and salt solubility, calorimetric properties such as enthalpy and heat capacity, and speciation properties. The model is validated with data covering temperature up to 473.15. K and sodium nitrate concentration up to saturation for the sodium nitrate-water binary system, temperature up to 379.15. K and nitric acid concentration up to pure acid for the nitric acid-water binary system, and sodium nitrate concentration up to 0.21 mole fraction and nitric acid concentration up to 0.3 mole fraction for the nitric acid-sodium nitrate-water ternary system.
AB - Nitric acid solution has been widely used in nuclear waste treatment processes. To support heat and mass balance calculations and process simulation, a comprehensive thermodynamic model is developed for sodium nitrate-water binary, nitric acid-water binary, and nitric-acid-sodium nitrate-water ternary systems. Based on symmetric electrolyte NRTL (eNRTL) activity coefficient model, the present work takes into account complete dissociation of sodium nitrate and partial dissociation of nitric acid in aqueous solution. With up to three temperature coefficients for each eNRTL binary interaction parameter, the model provides an accurate and thermodynamically consistent representation for phase equilibrium properties such as vapor pressure, boiling point, dew point and salt solubility, calorimetric properties such as enthalpy and heat capacity, and speciation properties. The model is validated with data covering temperature up to 473.15. K and sodium nitrate concentration up to saturation for the sodium nitrate-water binary system, temperature up to 379.15. K and nitric acid concentration up to pure acid for the nitric acid-water binary system, and sodium nitrate concentration up to 0.21 mole fraction and nitric acid concentration up to 0.3 mole fraction for the nitric acid-sodium nitrate-water ternary system.
KW - Electrolyte NRTL model
KW - Enthalpy
KW - Heat capacity
KW - Nitric acid
KW - Sodium nitrate
KW - Solubility
KW - Vapor-liquid equilibrium
UR - http://www.scopus.com/inward/record.url?scp=84945446635&partnerID=8YFLogxK
U2 - 10.1016/j.fluid.2015.04.015
DO - 10.1016/j.fluid.2015.04.015
M3 - Article
AN - SCOPUS:84945446635
SN - 0378-3812
VL - 407
SP - 105
EP - 116
JO - Fluid Phase Equilibria
JF - Fluid Phase Equilibria
ER -