(222w) Densities for Binary Systems Alkane + Thiophene At Temperatures From 313.15 to 363.15 K in the Range of 1-20 Mpa

In this paper, we present experimental results for the volumetric properties of two binary systems heptane + thiophene and nonane + thiophene at temperatures from 313.15 to 363.15 and pressures of 1 to 20 MPa. These experiments were performed in a static method coupled to the vibrating tube densimeter technique. It uses a synthetic-cell made of titanium; it withstands high pressures and temperatures. Vibrating periods of the fluid are obtained in the experiment; then, density of the studied fluid is obtained from a calibration procedure. For this case, we use water and nitrogen as reference fluids. The obtained uncertainty in density for these binary systems is less than 0.2 kg/m³. Afterwards, density was represented using an empirical equation of 6-parameters. Deviations between experimental and calculated values showed that these are within the experimental uncertainty. Thermodynamic derived properties are computed from the concerning expressions that involve the derivative of the empirical equation.