Thermodynamics of Geothermal Brines. I. Thermodynamic Properties of Vapor-Saturated NaCl (Aq) Solutions from 0-300 C

摘要

Osmotic and activity coefficient data, enthalpy data, and heat capacity data on aqueous sodium chloride solutions from various sources have been fitted to a thirteen parameter equation. The equation reproduces the osmotic coefficient data to +-0.005 over the composition range 0-6M and temperature range 0-300 exp 0 C, enthalpy data to +-5-10 cal/mole for compositions of 0-5M at temperatures from 25-100 exp 0 C, and heat capacity data to +-0.5 cal/ exp 0 K for compositions of 0-2M at temperatures from 25-200 exp 0 C. Tabulated values of the total Gibbs energy, enthalpy, and heat capacity, plus partial molal and excess thermodynamic quantities of sodium chloride solutions for compositions of 0-6M at 25 exp 0 C intervals from 0-300 exp 0 C are given along with the same quantities in graphical form for compositions of 0-6M at temperatures of 100-350 exp 0 C. (ERA citation 01:012888)