The high pressure sapphire cell apparatus is a unique tool to study, without sampling, phase behavior under a wide range of pressures. Using a cathetometer, very precise volume measurements can be recorded to measure liquid expansion and phase composition. Thus, this synthetic method enables the study of (1) phase equilibria of multi-component mixtures and (2) the partition behavior of catalyst or model compounds as a function of pressure.
Pollet, P., Ethier, A. L., Senter, J. C., Eckert, C. A., Liotta, C. L. High-pressure Sapphire Cell for Phase Equilibria Measurements of CO2/Organic/Water Systems. J. Vis. Exp. (83), e51378, doi:10.3791/51378 (2014).