화학공학소재연구정보센터
Journal of Supercritical Fluids, Vol.133, 444-454, 2018
Concurrent measurement of high-pressure binary phase equilibrium, density and dynamic viscosity
New equipment offering a novel combination of concurrent binary phase equilibria, saturated fluid density and dynamic viscosity determination, was developed. The setup (P-max 30 MPa; Tmax 393 K) includes a variable volume view cell to determine bubble/dew points and density, with a quartz-crystal resonator to measure dynamic viscosity. Phase equilibrium is determined visually, using a synthetically known composition (SynVisVar). Uncertainties in measurements are 0.06 MPa in pressure, < 0.0005 in mass fraction, and 0.2 K in temperature. Density is calculated to within < 0.003 of the value. The dynamic viscosity is determined by measuring the frequency shift over the quartz crystal, to within < 0.01 of the value. Equipment verification was done using n-dodecane and benzene at 0.1-30 MPa and 313-353 K while contributing to available benzene literature. Binary equilibrium measurements were verified using CO2 + ethyl tetradecanoate while presenting new data on the dynamic viscosity and density of the saturated binary phase.