Densities of toluene, carbon dioxide, carbonyl sulfide, and hydrogen sulfide over a wide temperature and pressure range in the sub- and supercritical state

Densities of toluene, carbon dioxide (CO2), carbonyl sulfide (COS), and hydrogen sulfide (H2S) have been measured with a new computer-controlled high-temperature high-pressure vibrating tube densimeter system (DMA-HDT) for temperatures from 273 K up to 623 K and pressures up to 40 MPa in the sub- and supercritical state. With respect to accuracy, reliability, suitability, and time consumption this system represents an optimum for measuring P rhoT-properties in the compressed liquid and supercritical state. Densities of liquid toluene, COS, and H2S as a function of temperature and pressure were correlated with the new three-dimensional density correlation system (TRIDEN). The P rhoT data from CO2 and the data from COS and H2S in the supercritical state and around the critical point were correlated with a virial-type equation of state. For checking the accuracy and suitability of the vibrating tube densimeter system the experimental densities of toluene and CO2 were compared with the results obtained using reference equations of state.