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An Experimental Study of the Heavy Hydrocarbon Impact on the Phase Behavior of Hydrocarbons

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Abstract

It is of much interest to study the heavy hydrocarbon impact on the phase behavior of hydrocarbons. Using a method of the precision adiabatic calorimetry the phase equilibria in quaternary mixtures of methane, propane, octane, and nonane have been studied. The phase diagrams for investigated mixtures have been plotted based on the experimental data. The phase transitions were localized by the finite discontinuities in temperature derivatives of the thermodynamic potentials. The heat capacity, internal energy, pressure, and temperature derivative of pressure at constant volume were measured in the range 170–320 K, up to 40 MPa. Quaternary mixtures as quasi-binary mixtures are presented. The first quasi-component of the quasi-binary mixture is the binary mixture with the constant methane/propane ratio. The second quasi-component of the quasi-binary mixture is the binary mixture of octane and nonane. Investigated hydrocarbon system is the combination of the simple hydrocarbon mixtures for the low concentration of octane and nonane. In the earlier papers we presented the simple hydrocarbon mixtures for the low concentration of octane, nonane, and decane, and quaternary mixtures of methane, propane, octane, and decane for the low concentration of octane and decane, which are the combination of the simple hydrocarbon mixtures for the low concentration of octane and decane. Our investigations show that quaternary hydrocarbon mixture for the low concentration of octane and nonane as well as the simple hydrocarbon mixtures for the low concentration of octane, nonane, and decane split into three phases, the macrophase composed of methane, propane, octane, and nonane, and two microphases formed by octane and nonane. In this system octane and nonane dissolved in the macrophase partly. Besides, the heavy components provoke a split of the liquid part of the quaternary mixture into two liquid phases.

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Abbreviations

p :

Pressure [MPa]

T :

Temperature [K]

U :

Internal energy [J]

x :

Concentration [mole fraction]

ρ :

Density [kg·m−3]

C V = (∂U/∂T)V :

Heat capacity at constant volume [kJ·kg−1·K−1]

(∂p/∂T)V :

Temperature derivative of pressure at constant volume (the thermal pressure coefficient) [MPa·K−1]

V:

Vapor phase

L(S):

Single-phase macrophase composed of methane, propane, and partly dissolved octane and nonane

LV(S):

Two-phase macrophase composed of methane, propane, and partly dissolved octane and nonane

L(SC9):

Single-phase macrophase composed of methane, propane, octane, and partly dissolved nonane

LV(SC9):

Two-phase macrophase composed of methane, propane, octane, and partly dissolved nonane

L1 :

Liquid phase of the quaternary mixture (octane-, nonane-lean phase)

L2 :

Liquid phase of the quaternary mixture (octane-, nonane-rich phase)

SC8 :

Microphase formed by octane

SC9 :

Microphase formed by nonane

SC8+C9 :

Microphase formed by octane and nonane

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Acknowledgments

This work was supported by the Russian Science Foundation under Grant No. 23-29-00088, https://rscf.ru/en/project/23-29-00088/.

Funding

Funding was provided by Poccийcкий Hayчный Фoнд (PHФ) (Grant Number 23-29-00088), https://rscf.ru/en/project/23-29-00088/.

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Authors and Affiliations

  1. National University of Oil and Gas «Gubkin University», Leninsky Prospekt, 65, Moscow, Russia

    V. M. Buleiko & D. V. Buleiko

Authors
  1. V. M. Buleiko
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  2. D. V. Buleiko
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Contributions

VMB wrote the main manuscript text and prepared Figs. 1, 2, 3, 4, 5, 6, and 7. DVB wrote the main manuscript text and Tables 1, 2, 3, 4, 5, 6, and 7. All authors reviewed the manuscript.

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Correspondence to V. M. Buleiko.

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Buleiko, V.M., Buleiko, D.V. An Experimental Study of the Heavy Hydrocarbon Impact on the Phase Behavior of Hydrocarbons. Int J Thermophys 44, 125 (2023). https://doi.org/10.1007/s10765-023-03234-x

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