Densities of toluene, carbon dioxide (CO 2 ), carbonyl sulfide (COS), and hydrogen sulfide (H 2 S) 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 PFTsproperties in the compressed liquid and supercritical state. Densities of liquid toluene, COS, and H 2 S as a function of temperature and pressure were correlated with the new three-dimensional density correlation system (TRIDEN). The PFT data from CO 2 and the data from COS and H 2 S 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 CO 2 were compared with the results obtained using reference equations of state.

No abstract

No abstract

No abstract

The (p, q, T) properties of pure methanol, the (p, q, T) properties and apparent molar volumes V / of ZnBr 2 in methanol at T = (298.15 to 398.15) K and pressures up to p = 40 MPa are reported, and apparent molar volumes have been evaluated. The experimental (p, q, T, m) values were described by an equation of state. For the solutions the experiments were carried out at molalities m = (0.05772, 0.37852, 0.71585 and 1.95061) mol AE kg À1 of zinc bromide.

No abstract

Thermal conductivities have been measured for three linear siloxanes [hexamethyl disiloxane (MM), octamethyltrisiloxane (MDM), decamethyltetrasiloxane (MD 2 M)], two cyclic siloxanes [octamethylcyclotetrasiloxane (D 4 ), decamethylcyclopentasiloxane (D 5 )], and a mixture of 50 mass % MDM þ 50 mass % MD 2 M in the temperature range from 290 to 520 K and the pressure range from 500 to 10000 kPa using the transient hot wire method and correlated with a temperatureÀpressureÀthermal conductivity relationship. Moreover, the thermal conductivities at atmospheric pressure were measured for MM, D 4 , D 5 , and MD 2 M. The data were compared with the available data from the literature for four compounds. Additionally, the viscosities of the five siloxanes were measured in the temperature range from 238 to 378 K at atmospheric pressure using a rotational Stabinger viscometer.

No abstract