Xiangyang Liu,Tian Lan,Chengjie Wang,Manh Quang Nguyen,Ying Zhang,Maogang He
Tert-butanol is a good additive for improving gasoline performance, but as two of the most important thermodynamic properties, the critical temperature ( T c ) and critical pressure ( p c ) of tert-butanol and alkane systems have not been studied. In this work, the experimental data of the T c and p c of five binary systems (tert-butanol + cyclohexane , tert-butanol + n-hexane, tert-butanol + n-heptane, tert-butanol + n-octane, and tert-butanol + n-nonane) and a ternary system (tert-butanol + n-heptane + n-octane) were obtained using a flow method. The T c and p c of the binary systems were fitted using the Redlich–Kister equations with maximum average absolute relative deviations (AARDs) of 0.19% and 0.36% for T c and p c , respectively. The T c and p c for tert-butanol + n-heptane + n-octane were correlated by Singh and Sharma's equations and Cibulka's equations with AARDs less than 0.09% and 0.32%, respectively. The experimental data of T c and p c were also used to verify and improve the accuracy of our previous prediction model.
Carbonate esters are used as additives in biodiesel to improve its thermophysical properties for better applicability. In this work, the experimental densities, dynamic viscosities and refractive indices for binary mixtures of dimethyl carbonate and four fatty acid esters (methyl decanoate, ethyl decanoate, methyl laurate, ethyl laurate) have been measured and presented over the complete concentration range at temperatures range from 293.15 to 323.15 K under normal pressure. The excess molar volumes and the viscosity deviations of the four binary mixtures were calculated with the measured data and correlated with the Redlich-Kister equation. The excess Gibbs energy of activation was also calculated. From the values of excess properties of the binary mixtures and its deviations indicate that the changes of molecular interactions in the mixtures. The experimental results could be useful for the study of biodiesel-carbonate blended fuels.
Biofuel may be an important component of aviation fuel for its significant advantages. In the present work, two biofuel samples, methyl laurate and pinane, are selected for blending research with n-dodecane, a typical model fuel of aviation kerosene. Densities and viscosities for the ternary system pinane (1) + n-dodecane (2) + methyl laurate (3) and corresponding binary systems have been measured at the temperatures from 293.15 to 333.15 K and atmospheric pressure. The excess molar volume (VmE) and viscosity deviation (Δη) of binary systems have been calculated based on experimental data and fitted to the Redlich–Kister equation, while those of the ternary system have been fitted to Nagata–Tamura, Redlich–Kister, Cibulka, and Singh semiempirical equations, respectively. The values of the excess molar volume are all positive for all investigated systems, while the viscosity deviations are all negative. The results are discussed from the perspective of intermolecular force and the structure. Furthermore, the densities and viscosities of both binary and ternary mixtures are satisfactorily correlated using the Jouyban–Acree model.
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