Influence of alkyl group and temperature on excess thermodynamic properties of diethyl carbonate and their binary mixtures at 0.1 MPa

Abstract

In this work, the experimental densities, ρ, and speeds of sound, u, of binary mixtures of diethyl carbonate (DEC) with the three isomers of xylene (ortho-, meta- and para-xylenes) were measured over the entire composition range at T=(298.15–323.15) K, and at atmospheric pressure (0.1MPa). From the experimental data, the excess molar volumes, VmE, excess isentropic compressibility, κsE, excess molar isentropic compressibility, κs,mE, and deviation in speed of sound, μD have been evaluated. Excess parameters were fitted to the Redlich–Kister polynomial equation to obtain the binary coefficients and the standard errors. Excess partial molar volumes (V¯m,1E and V¯m,2E) and their limiting values at infinite dilution (V¯m,10E and V¯m,20E) have been calculated from the experimental density measurements. Excess partial molar isentropic compressibilities, κ¯s,m,1E and κ¯s,m,2E of both components and their respective limits at infinite dilution, κ¯s,m,10E and κ¯s,m,20E, were analytically obtained using Redlich–Kister type equations.