Abstract
Poor solubility of heavy hydrocarbons in CO2 has limited the application of CO2-EOR (enhanced oil recovery) in modern oil recovery industry to some extent. Therefore, it is crucial to investigate the solubility regularity of different hydrocarbons in supercritical carbon dioxide (scCO2) in the first place. In this paper, our objective is to explore the solubility of n-alkanes (C6H14–C18H38) in scCO2. To measure cloud point pressures, the experiment utilizes high-pressure view chamber, and results for accuracy and repeatability of the experimental method and instrument are evidently positive. Then, cloud point pressures for n-alkanes from 318K to 343K show a proximately linear and positive correlation with the temperature; they also increase with expanding chain length of n-alkanes. In addition, the result of x (molar fraction of n-alkane at cloud point pressure) indicates that x has a positive correlation with the pressure at identical temperature, and when pressure is constant, temperature increase will reduce x. Finally, relationship studies between density of CO2 and x reveal that, density of CO2 has a positive influence on the solubility of n-alkane, and the Chrastil model corrects lnρ and lnS data. The measured data align with the Chrastil model, with a maximum AARD value of 9.85%.
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