Density, Viscosity, Refractive Index, and Surface Tension of Binary Mixtures of 3-oxa-1,5-Pentanediol with 2-Propanol, 1,2,3-Propanetriol, and 1-Decanol from 283.15 to 403.15 K as Reference Systems for Evaporation Experiments

Thermophysical properties of potential reference systems for the characterization of evaporators, especially wiped film evaporators, are presented. Therefore, the binary mixtures of diethylene glycol (IUPAC: 3-oxa-1,5-pentanediol) with decan-1-ol, glycerol (IUPAC: 1,2,3-propanetriol) and isopropyl alcohol (IUPAC: 2-propanol) were considered. The refractive index at 293.15 K (589 nm) was measured using a refractrometer. The density was measured in a temperature range from 283.15 to 403.15 K depending on the boiling temperature of the fluids using an oscillating U-tube. The dynamic viscosity was determined in a temperature range from 283.15 to 403.15 K depending on the boiling temperature of the fluids using a kinematic viscometer based on a modified Couette measuring principle (Stabinger viscometer). The surface tension was measured in a temperature range from 293.15 to 363.15 K using the pendant drop method. The temperature dependence of the density, viscosity and surface tension of the pure components was described using standard literature models. The excess properties excess refractive index, excess molar volume, Δln(η/mPa·s)^E and excess parachor were modeled using a temperature dependent Redlich–Kister approach.