Comparison of thermodynamic properties of renewable diesel and commercial diesel

Abstract

This paper presents experimental and predicted results of volumetric properties for two biodiesels: Soybean Oil Biodiesel (SOB) and Waste Cooking Oil Biodiesel (WCOB) compared to the Normafluid as commercial diesel. Densities of SOB and WCOB were measured from 298.15 K to 393.15 K and from 0.1 MPa to 140 MPa, using an Anton Paar high-pressure vibrating tube densimeter (DMA HPM), whereas, the density of Normafluid was collected from literature. The density was predicted using the Tait Equation of Stat. This equation shows an efficiency of the prediction of the density of all products presented in this work with AAD=0.01% for each compound. Therefrom, thermodynamic properties as isobaric expensivity, $\alpha_{p}$, and isothermal compressibility, кT, were determined over wide pressure and temperature ranges. $\alpha_{p}$ and кT, have the same behavior as a function of temperature and pressure, while commercial diesel has a higher values of $\alpha_{p}$ and кT than those of biodiesel at high temperature and low pressure, this information is of major importance in design engineering.