Excess volumes for the binary mixtures of methyl ethyl ketone with benzene, toluene, chlorobenzene, bromobenzene, and nitrobenzene have been determined at 303.15 and 313.15 K. VE values are negative over the entire range of composition for all the systems and at both temperatures. The data are examined In terms of Flory's original theory. A sign agreement Is found for the systems containing polar-polar components which falls In the case of polar-nonpolar systems. Flory's modified method predicted a sign agreement In VE and HE for the system methyl ethyl ketone + benzene.
Excess volumes for the binary liquid mixtures of methylisobutylketone with benzene, toluene, chlorobenzene, bromobenzene, and nitrobenzene have been measured at 303.15 and 313.15 K. Excess volumes were negative for all the systems over the entire range of composition and at both the temperatures. The behaviour of VE as a function of composition and temperature was studied. Viscosity data have also been determined for the five systems at 303.15 K. The excess viscosity, A In q, has been calculated and its behaviour as a function of composition was investigated. Introduction As a part of a study on thermodynamic and physical properties of binary liquid mixtures containing aliphatic ketone as one of the components (1 -4), we have reported here excess volumes and viscosities for five binary liquid mixtures. Excess volumes at 303.15 and 3 13.15 K and viscosities at 303.15 K have been measured for methylisobutylketone (MIBK) with benzene, toluene, chlorobenzene, bromobenzene, and nitrobenzene and the molecular interactions in these systems have been investigated. The systems have been selected with a view to study the effect of molecular interactions due to substitution of different groups on the phenyl ring. Further, a literature survey revealed that the two properties have not been studied for the five systems.Prigogine-Patterson-Flory equation of state theory developed on the basis of van der Waals model for energy ( 5 ) has been applied quite successfully to predict excess volumes (6-9). Patterson (7, 8) has stressed the importance of cohesive energy factor in the prediction of VE. We have applied the model for the five systems in which cohesive energy difference between the components changes gradually and VE values are calculated using pure component parameters. Further, the viscosity expressions developed by Bloomfield and Dewan (10) have been used to obtain various contributions to excess viscosity.
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