Densities of levulinic acid, ethyl levulinate, butyl levulinate, furfural, and furfuryl alcohol have been measured using a high-pressure, high-temperature vibrating tube densimeter system over a temperature range from 283.15 to 338.15 K and a pressure range from 0.1 to 60.0 MPa. In the case of levulinic acid, the temperature range was from 308.15 to 338.15 K. The experimental densities have been satisfactorily correlated with the temperature and pressure using the TRIDEN equation. Finally, from the measured densities, some thermodynamic properties, isobaric thermal expansion and isothermal compressibility, have been calculated.

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In this work, viscosities of binary mixtures of isomeric chlorobutanes with diisopropylether have been determined as a function of composition under atmospheric pressure and in the temperature range from 283.15 K to 313.15 K with steps of 5 K. Kinematics viscosities were measured using an Ubbelohde viscosimeter; absolute viscosities were obtained from kinematic viscosities and densities. Finally, we have used the Asfour method for predicting the dependence of viscosity with composition and comparing it with our experimental data.

To study the influence of molecular structure on the volumetric properties of chloroalkanes, the densities of 1-chloropropane, 2-chloropropane, 1-chlorobutane, 2-chlorobutane, 1-chloro-2-methylpropane, and 2-chloro-2-methylpropane have been measured using a high-pressure high-temperature vibrating tube densimeter system over a temperature range from (283.15 to 328.15) K and a pressure range from (0.1 to 65.0) MPa. In the case of 1-chloropropane, 2-chloropropane, and 2-chloro-2-methylpropane the temperature ranges were (283.15 to 318.15) K, (283.15 to 308.15) K, and (283.15 to 323.15) K, respectively. The experimental densities have been satisfactorily correlated with temperature and pressure using the Tait equation. Moreover, using this equation and thermodynamic relations, isobaric expansibility, isothermal compressibility, and internal pressure have been calculated and analyzed in terms of molecular interactions and structure. The analyzed chloroalkanes follow the regular behavior of the liquids, and dipole−dipole interactions are stronger in primary than in secondary or tertiary chlorinated compounds, as it could be expected. ■ INTRODUCTIONThe reliable knowledge of the volumetric behavior of pure compounds and their mixtures is of great importance in many fields of research as well as in industrial practice. The densities of fluids as a function of temperature, pressure, and composition are particularly important for the design of industrial plants, pipelines, and pumps. Furthermore, reliable density values are the basis for the development of correlation equations and equations of state. 1−4 Chloroalkanes are compounds of great interest due to their use in industry mainly as degreasing agents, detergents, paint removers, solvents, and chemical intermediates; 5,6 moreover, from a theoretical point of view, the study of density and derived properties provides valuable information about the strength of dipole−dipole interactions and free-volume effects. In this study we report densities of 1-chloropropane, 2-chloropropane, 1-chlorobutane, 2-chlorobutane, 1-chloro-2-methylpropane, and 2-chloro-2-methylpropane in a temperature range from (283.15 to 328.15) K (in the case of 1-chloropropane, 2-chloropropane, and 2-chloro-2-methylpropane the temperature ranges were (283.15 to 318.15) K, (283.15 to 308.15) K, and (283.15 to 323.15) K, respectively) and in a pressure range from (0.1 to 65.0) MPa.Different approaches are used in the literature for the correlation of compressed liquid densities; from equations of state 7 to explicit density-equations. 8 In this work we have employed the well-known Tait equation 9 to correlate our experimental results with temperature and pressure. Using the fitting equation and thermodynamic relations some related properties, such as isobaric expansibility, isothermal compressibility, and internal pressure, have been obtained.A survey of the literature shows that ρT and pρT studies involving the chloroalkanes considered here are scarce 6,10−15 and most of them are mainly focused on 1-...