Measurements and Correlations of Density, Viscosity, and Vapor Pressure for Monomethyl Azelate, Dimethyl Azelate, Monoethyl Azelate, and Diethyl Azelate

Biobased azelaic acid and its esters are important organic compounds with various applications in the chemical industry. In this work, the density and viscosity of monomethyl azelate, dimethyl azelate, monoethyl azelate, and diethyl azelate were measured within the temperature range of T = (293.15 to 343.15) K at atmospheric pressure. Additionally, the vapor pressure of these compounds was determined within the temperature range of T = (411.15 to 435.45, 370.10 to 431.15, 413.15 to 441.15, 388.35 to 444.95) K. To analyze the experimental data, temperature-dependent correlation equations were employed, resulting in correlation coefficients greater than 0.99 for all equations. Furthermore, the molar enthalpy of vaporization was calculated at the average temperature of the experimental range using the Clausius–Clapeyron equation. Overall, these findings offer valuable insights for improving synthesis processes and guiding future applications.