An Experimental Device for Studying the Solubility of Carbon Dioxide in Hydrocarbons in Wide Ranges of Working Temperatu
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An Experimental Device for Studying the Solubility of Carbon Dioxide in Hydrocarbons in Wide Ranges of Working Temperatures and Pressures A. V. Radaeva,*, A. A. Mukhamadieva, and A. N. Sabirzyanova a Kazan
National Research Technological University, Kazan, 420015 Republic of Tatarstan, Russia *e-mail: [email protected]
Received April 20, 2020; revised May 11, 2020; accepted May 13, 2020
Abstract—A device was designed to measure the solubility of carbon dioxide in hydrocarbons at temperatures up to 473 K and pressures up to 25 MPa. It can be used to study the solubility of CO2 at state parameters that are supercritical for CO2 in the presence of a porous medium in the oil reservoir model and in the absence of it. The results of the experiments on measuring the solubility of carbon dioxide in kerosene are described using the Peng–Robinson equation of state. This technique for measuring the solubility both of CO2 in a hydrocarbon and of a hydrocarbon in CO2 in the mode of dynamic filtration in a porous medium can be applied in power engineering and machine building to study changes in the thermophysical and physicochemical properties of hydrocarbons. DOI: 10.1134/S0020441220050346
INTRODUCTION The dissolution of carbon dioxide in hydrocarbons has a significant effect on their thermophysical properties, especially at high temperatures and pressures, since both factors exert opposite effects: an increase in temperature decreases the solubility of CO2 in a hydrocarbon, while an increase in the pressure increases it. Its solubility is especially great at supercritical state parameters (above 31.5°C and above 7.5 MPa). The properties of CO2 in the supercritical state are intermediate between its properties in the gas and liquid phases: it has a high density that is close to the liquid density, a low kinematic viscosity, and a high diffusion coefficient, which affects the change in the properties of hydrocarbons: the dynamic viscosity of a hydrocarbon is significantly reduced and the coefficient of volumetric expansion increases. Moreover, the higher the initial viscosity of the hydrocarbon is the larger its decrease is upon CO2 dissolution in it. Reliable computational methods for determining the solubility of gases in hydrocarbons have not yet been created. As a result, reliable experimental data on solubility are required for the calculation of the solubility of CO2 in oil and in transformer or engine oil according to the well-known equations of state (Brusilovsky and Peng–Robinson equations, etc.) [1]. Only the temperature dependences for the solubility coefficient of gases in hydrocarbons are available for some types of hydrocarbons and the range of parameters [2, 3].
However, these do not include the effect of the pressure in the hydrocarbon–CO2 system on the solubility coefficient, which leads to significant errors when calculating the dynamic viscosity of hydrocarbon–supercritical CO2 systems. The data on the solubility coefficients of gases in hydrocarbons produced in a dynamic mode are
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