Densities, Speeds of Sound, and Isentropic Compressibilities of Binary Mixtures of {Alkan-1-ols + 1,2-Dimethylbenzene, or 1,3-Dimethylbenzene, or 1,4-Dimethylbenzene, or Ethylbenzene} at (293.15, 303.15, and 313.15) K

Abstract

Densities and speeds of sound of binary liquid mixtures of {nonan-1-ol and decan-1-ol + 1,2-dimethylbenzene, or 1,3-dimethylbenzene, or 1,4-dimethylbenzene, or ethylbenzene} were measured over the entire composition range at (293.15, 303.15, and 313.15) K and at a pressure of 0.1 MPa. The experimental densities and speeds of sound were used to obtain the excess molar volumes and the isentropic compressibilities of the binary liquid mixtures. The Redlich−Kister polynomial was fitted to the excess molar volumes to derive the binary coefficients and the standard errors between the experimental and the calculated quantities. The excess molar volumes are positive for the binary liquid mixtures of {nonan-1-ol and decan-1-ol + ethylbenzene} over the entire composition range at (293.15 to 313.15) K. For the binary liquid mixtures of {nonan-1-ol + 1,2-dimethylbenzene, or 1,3-dimethylbenzene, or 1,4-dimethylbenzene}, the excess molar volumes show sigmoid trend, and the values vary from negative to positive over the whole composition range, except for the binary liquid mixtures of (nonan-1-ol + 1,2-dimethylbenzene) at (303.15 and 313.15) K where the excess molar volumes are positive over the whole composition range. For the binary liquid mixtures of {decan-1-ol + 1,2-dimethylbenzene, or 1,3-dimethylbenzene}, the excess molar volumes show slightly s-shaped trend at (293.15 and 303.15) K, but the excess molar volumes are positive over the whole composition range at T = 313.15 K for these binary liquid mixtures. For the binary liquid mixtures of {decan-1-ol + 1,4-dimethylbenzene), the excess molar volumes show sigmoid trend over the whole composition range at (293.15 to 313.15) K. As we go from nonan-1-ol to decan-1-ol and increase the temperature from (293.15 to 313.15) K, the excess molar volumes become more positive for all the binary liquids mixtures which indicate weak intermolecular interactions between (nonan-1-ol and decan-1-ol + aromatic hydrocarbon) at higher temperatures.