Densities, excess molar volumes, and refractive indices of ethyl acetate and aromatic hydrocarbon binary mixtures

Densities, excess molar volumes, refractive indices, and changes in refractive index on mixing for (ethyl acetate + benzene, or methylbenzene, or ethylbenzene, or 1-4-dimethylbenzene, or 1-methylethylbenzene, or 1-3-5-trimethylbenzene, or 1-1-dimethylethylbenzene) have been determined at T = 298.15 K. The excess molar volumes and changes in refractive index have been fitted to Redlich-Kister polynomials. The pi-electrons interactions of the benzene ring and the peculiar plate shape of the aromatic molecules are noticeably modified by the presence of the ethyl acetate molecules of a different nature. The intermolecular interactions are strongly modified and result in positive excess volumes except for toluene or p-xylene whose values are close to zero. The refractive indices were compared with calculated values using mixing rules proposed by several authors. (C) 2002 Elsevier Science Ltd. All rights reserved.