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A. I. Druzhinina, A. A. Efimova, R. M. Varushchenko
The vapour
pressure and heat capacities of perfluor-N-(4-methyl-cyclohexyl)piperidine
Abstract
The heat
capacity of perfluoro-N-(4-methyl-cyclohexyl)piperidine (PMCP) have been
measured by an adiabatic calorimetry. The purity of the substance under study,
the triple point temperature, and the enthalpy of fusion has been obtained. The
temperature dependence of the saturation vapour pressure was defined by a
comparative ebulliometry in the ranges of the pressure and temperature from 6.2
kPa to 101.6 kPa and 374.2 K to 460.9 K, respectively. The enthalpy of
vaporization have been measured by calorimetric method at T = 298.15 K.
Some thermodynamic properties like the normal boiling temperature, the enthalpy
of vaporization, (T), in dependence on temperature, and the critical
parameters of the PMCP were derived from the saturation vapour pressure. The
values of enthalpy of vaporization at T = 298.15 K, obtained by
experimental and calculation methods, agree within the error limits that proves
their reliability and that of = f(T)
equation used as extrapolated one.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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