Solubility of hydrogen in sodium chloride brine at high pressures

Abstract

We report measurements of the solubility of hydrogen in pure water and in sodium chloride brine of molality 2.5 mol/kg at temperatures between 323.15 K and 423.15 K and at pressures up to about 40 MPa. The estimated expanded relative uncertainty of the hydrogen solubility at given temperature and pressure is 3%, with a coverage factor of 2. The new results, together with data from the literature for hydrogen solubility in water and brine, are used to construct a simple model to predict hydrogen solubility in water and sodium chloride brines as a function of temperature, pressure and salt molality.