Abstract
Cosolvents are crucial to enhance the dissolving ability of CO2 in crude oil and reduce the minimum miscibility pressure (MMP) in the CO2 enhanced oil recovery (EOR) process. Ethyl acetate is a commonly used cosolvent and can efficiently accelerate CO2 dissolution in crude oil. In this work, a static synthesis method is adopted to measure CO2 solubility in alkanes (n-heptane, n-nonane, undecane, tridecane, heptadecane) with different concentrations of ethyl acetate at various temperatures (313.15, 343.15, 373.15) K and pressures up to 15.06 MPa. And the CO2 solubility is positively correlated with the concentration of ethyl acetate. The solubility data were compared with the calculation results of PR and PC-SAFT, and the average absolute relative deviations in pressures (Δp) were 4.00 %–5.36 % and 3.33 %–8.68 %, respectively. PR can be used with known binary interaction parameters (fitted from the literature or experimental data) and PC-SAFT can predict these systems without using any relevant experimental data.
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