Direct calorimetric measurement of enthalpies of aqueous sodium chloride solutions at high temperatures and pressures

Robert B. Kasper, John R. Holloway, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

A new calorimetric technique, which combines a hydrothermal cold-seal pressure vessel and a Calvet-type microcalorimeter, provides direct enthalpy measurements of solutions at temperatures to 1073 K and pressures to 200 MPa. We report initial results for enthalpies measured for NaCl + H2O at temperatures of 985, 536, and 457 K and pressures of 51 and 100 MPa over a molality range of 0 to 6 mol kg-1. The partial molar enthalpies of NaCl, calculated from the results at temperatures above 423 K and pressures of 50 to 100 MPa, appear to be significantly different from those observed along the liquid-vapor saturation curve.

Original languageEnglish (US)
Pages (from-to)13-24
Number of pages12
JournalThe Journal of Chemical Thermodynamics
Volume11
Issue number1
DOIs
StatePublished - Jan 1979

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Physical and Theoretical Chemistry

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