Modeling thermophysical properties of several liquid adipates

Abstract

The densities and several derived thermodynamic properties of 6 liquid adipates were correlated and predicted through a proposed perturbed hard-chain equation of state (PHC EoS) containing a term of Yukawa tail. The adipates under study comprised the diesters of methyl and ethyl types. The EoS was constructed through correlating it with densities and isothermal compressibilities of studied systems in 288–403 K range and pressure at 0.1Mpa. Then the EoS was applied to predict densities and several first derivative thermodynamic properties including isobaric expansivities, thermal pressure coefficients and internal pressure values for pressures up to 140 MPa. The average absolute relative deviations (AARD) of densities and isothermal compressibilities were found to be 0.21 % and 8.58 %, respectively. Then, the rest of derived thermodynamic properties of the aforementioned systems were predicted and compared with a Tait-type equation cited in literature. Further, a rough hard-sphere-chain (RHSC) model in conjunction with the proposed EoS has been successfully employed to correlate and predict the viscosities of 4 selected liquefied adipates, for which the experimental values were available in the literature. The model could correlate/predict 1075 experimental viscosity data points of the above-mentioned adipates in 283–373 K range and pressures up to 65 MPa with the AARD of 2.14 %. The accuracy of the results from the RHSC-based model has also been compared with those obtained from other RHS-based model of literature.