«Proceedings of Gubkin University»

Adiabatic calorimetry of hydrocarbons presented by combination of simplest mixtures of gas-condensate hydrocarbon system

UDC: 622.279.72
DOI: -

Authors:

¹ National University of Oil and Gas “Gubkin University”, Moscow, Russian Federation

Keywords: adiabatic calorimetry, isomorphism, macrophase, microphase, the simplest mixture of the gas-condensate hydrocarbon system, phase equilibria

Annotation:

This work presents the recent results of the accurate calorimetric measurements of phase equilibria in hydrocarbon mixtures for the low concentration of the С4+ components. Ternary, quaternary and quinary mixtures are studied. The phase diagrams for these mixtures are plotted based on the experimental data. The phase transitions are localized by the finite discontinuities and singularity in temperature derivatives of the thermodynamic potentials. The heat capacity, internal energy, pressure, and temperature derivative of pressure at constant volume are measured in the range 110–420 K, up to 60 MPa. An effective simulation of the investigated mixtures is realized by the combination of the simplest mixtures of the gas-condensate hydrocarbon system. The simplest mixture of the gas-condensate hydrocarbon system consists of the components forming the macrophase (a binary mixture with the constant methane/propane ratio) and one component forming the microphase (one of the C4+ heavy components). The quaternary mixture, containing octane and nonane as the heavy components, is presented by the combination of two the simplest hydrocarbon mixtures, the former containing octane as the heavy component, and the latter containing nonane as the heavy component. By analogy, the quinary mixture containing octane, nonane and decane as the heavy components, is presented by the combination of three simplest hydrocarbon mixtures, or by the combination of one ternary (the simplest) and one quaternary mixture.

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