Phase diagram of aqueous solution at high pressure and low temperature

This paper presents a constant mass high pressure isothermal calorimeter an d describes the range of applications that this type of equipment can deal with. As an example, the thermophysical properties of an aqueous solution o f MgSO4 at low temperature and at high pressure have been investigated. The main results showed that the phase change heat of the solution decreased w ith increasing pressure and the phase change temperature of the eutectic co ncentration was depressed under high pressure. Those changes could be relat ed to the MgSO4 solubility and to water latent heat changes.