Study of phase equilibria in a two-component system diphenyloxide  - n -  nonadecane

A. I. Kazakova; Казакова А. И.; I. G. Yakovlev; Яковлев И. Г.; I. K. Garkushin; Гаркушин И. К.

doi:10.31857/S0235010624010027

Study of phase equilibria in a two-component system diphenyloxide - n - nonadecane

Authors: Kazakova A.I.¹, Yakovlev I.G.¹, Garkushin I.K.¹
Affiliations:
1. Samara State Technical University
Issue: No 1 (2024)
Pages: 17-25
Section: Articles
URL: https://journals.rcsi.science/0235-0106/article/view/256450
DOI: https://doi.org/10.31857/S0235010624010027
ID: 256450

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Abstract

Using the Schroeder, UNIFAC and UNIFAC Dortmund methods, the fusibility diagram of the diphenyloxide – n –nonadecane system was calculated and it was shown that it belongs to the eutectic type. Individual substances and their mixtures were studied experimentally using a differential scanning microcalorimeter. On the DTA heating curve of the eutectic alloy, two endo-effects are noted, corresponding to the polymorphic transition of n–nonadecane and the melting of the eutectic. A comparison of the eutectic coordinates calculated by these methods with experimental data is presented. For a eutectic alloy, the specific enthalpy of fusion, molar values of entropy and enthalpy of fusion, volumetric specific enthalpy of fusion and density for standard conditions are calculated. The eutectic mixture can be recommended for use as a coolant, as well as the working fluid of a heat accumulator.

Keywords

eutectic, diphenyl oxide, n-nonadecane, phase equilibrium state

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