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JOURNALS // Teplofizika vysokikh temperatur // Archive

TVT, 2010 Volume 48, Issue 3, Pages 348–355 (Mi tvt737)

This article is cited in 7 papers

Thermophysical Properties of Materials

Determination of saturated vapor pressure of organic substances from the triple to critical point

R. M. Varushchenko, A. I. Druzhynina

M. V. Lomonosov Moscow State University, Department of Chemistry

Abstract: Methods are given of extrapolating the saturated vapor pressure of substances of “atmospheric range” to the entire liquid phase region from the triple to critical point. The extrapolation of the $pT$ parameters from room temperature to the triple point is performed by simultaneous processing of vapor pressure and of differences between the heat capacities of ideal gas and liquid. The liquid-vapor equilibrium in the region from the normal boiling temperature to the critical point is predicted by the law of corresponding states of L. P. Filippov using the experimentally obtained $pT$ data and values of density of liquids. Experimental facilities are described for determining the saturated vapor pressure by the comparison ebulliometric method and for determining the low-temperature heat capacity by the vacuum adiabatic calorimetry. The methods of extrapolating the vapor pressure are tested with standard substances for which reliable $pT$ data are available for the entire liquid phase region.

UDC: ÓÄÊ 536.432

Received: 17.06.2009


 English version:
High Temperature, 2010, 48:3, 328–335

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