First and second thermodynamic mixing functions of ethylbenzene+n-nonane, +n-decane,and+n-dodecane at 25 and 45°C |
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Authors: | A D Matilla G Tardajos M Diaz Peña E Aicart |
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Institution: | (1) Departamento de Quimica Fisica, Facultad de Ciencias Quimicas, Universidad Complutense, 28040 Madrid, Spain |
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Abstract: | Isothermal compressibilities T and isobaric thermal expansion coefficients p have been determined for mixtures of ethylbenzene+n-nonane, +n-decane, and +n-dodecane at 25 and 45°C in the whole range of composition. The excess functions
and
have been obtained at each measured mole fraction. The first one
is zero for ethylbenzene +n-nonane, positive for ethylbenzene +n-decane, and +n-dodecane and increases with chain length n of the n-alkane. The
function is positive for the three studied systems and nearly constant with n. Both mixing functions increase slightly with temperature. From this measurement and supplementary literature data of molar heat capacities at constant pressure C
P
, the isentropic compressibilities S, the molar heat capacities at constant volume C
V
and the corresponding mixing functions have been calculated at 25°C. Furthermore, the pressure dependence of excess enthalpy H
B
,
at zero pressure and at 25°C has been obtained from our experimental results of
and experimental literature values for excess volume V
E
. |
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Keywords: | Compressibilities isobaric thermal expansion heat capacities excess volumes excess enthalpies mixing functions pressure liquid mixtures ethylbenzene nonane decane dodecane |
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