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Ultradźwiękowe badanie asocjacji 3-metylopyrazolu w cykloheksanie

100%

Bebek K. , Chorążewski M. , Filosek G.

tom Vol. 19

19-26

The ultrasound velocities in and densities of mixtures of 3-methylpyrazol with cyclohexane and in the pure components were measured with in the temperature range 293.15 - 308.15 K. The adiabatic compressibilities, K, = -(deltaV/delta p)s , as well as the excess molar volumes, VE and free intermolecular lengths, L, were determined in the whole concentration range at few different temperatures for all solutions studied. Using the measurement results in connection with literature data, the isothermal compressibility coefficients, betaT = -1IV(BV/delta p)T , and isochoric molar heat capacities, Cv for the pure components were calculated and used to estimate the excess adiabatic compressibilities, K sE, of the mixtures under test according to the thermodynamically rigorous definitions recommended by Benson et al. The dependencies of those excess functions on the mixture composition, reproduced by the Redlich-Kister equations, were compared and discussed in terms of the free intermolecular length and other factors affecting the specific self-association of 3-methylpyrazol in cyclohexane. The measurement results were analysed applying the modified Chen and Bagley model with two estimated parameters. A modification of the Chen and Bagley model was shown to be able to reproduce the concentration dependence of the excess molar volume, as well as to describe satisfactorily the quantitative effects of association of 3-methylpyrazol in cyclohexane.

Acoustic and Volu,E Effects Of Self-Association Of 3-Methylpyrazole In Cyclohexane

100%

Bebek K. , Filosek G. , Ernst S.

tom Vol. 25

23-28

The speeds of ultrasound in and densities of 3-methylopyrazole with cyclohexane mixtures were measured in the whole concetration range at 293.15 and 313.15 K. The Excess molar volumes, free volumes excess volumes and diabatic copressibilty coefficients, as well as the free intermolecular lenghts were determinated for the binaries. The dependance of the excess molar volumes and excess free volumes on the mixture composition were compared and discussed in terms of the free intermolecular lenght and other factors affecting the self-association of 3-methylopyrazole and structural changes of the non-polar solvent. Search Site