TY - JOUR
T1 - Effect of temperature on crude oil extraction by SC-CO2 at 40–70 °C and 40–60 MPa
AU - Rudyk, S.
AU - Spirov, P.
AU - Tyrovolas, A.
N1 - Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2018/3
Y1 - 2018/3
N2 - The extraction process of crude oil by supercritical CO2 was simulated in a high pressure extractor at 40, 50, 60 and 70 °C, and at 20, 40 and 60 MPa in order to investigate the effect of temperature on oil recovery. The total recovery of oil increased by 30–40% at the pressure increase from 20 MPa to 60 MPa. The temperature effect on the total recovery at 40, 50 and 60 °C was insignificant while the total recovery increased by 10% as the temperature rose from 40 °C to 70 °C. The vapor recovery did not change substantially with the temperature and pressure increase at temperatures higher than 40 °C. The isotherms of liquid recovery formed a concave surface because of higher extraction results at 40 °C and 70 °C indicating a crossover pressure phenomenon. The fingerprints of the extracted oil fractions obtained by GC–MS chromatography at various pressures and temperatures exhibited a variety of shapes. A correlation was obtained between liquid oil recovery and sums of selective specific single carbon number groups. Lighter hydrocarbons of C7-C10 group were representative at 20 MPa, intermediate hydrocarbons of C15-C19 group at 40 MPa, and heavier hydrocarbons of C23-C31 group at 60 MPa.
AB - The extraction process of crude oil by supercritical CO2 was simulated in a high pressure extractor at 40, 50, 60 and 70 °C, and at 20, 40 and 60 MPa in order to investigate the effect of temperature on oil recovery. The total recovery of oil increased by 30–40% at the pressure increase from 20 MPa to 60 MPa. The temperature effect on the total recovery at 40, 50 and 60 °C was insignificant while the total recovery increased by 10% as the temperature rose from 40 °C to 70 °C. The vapor recovery did not change substantially with the temperature and pressure increase at temperatures higher than 40 °C. The isotherms of liquid recovery formed a concave surface because of higher extraction results at 40 °C and 70 °C indicating a crossover pressure phenomenon. The fingerprints of the extracted oil fractions obtained by GC–MS chromatography at various pressures and temperatures exhibited a variety of shapes. A correlation was obtained between liquid oil recovery and sums of selective specific single carbon number groups. Lighter hydrocarbons of C7-C10 group were representative at 20 MPa, intermediate hydrocarbons of C15-C19 group at 40 MPa, and heavier hydrocarbons of C23-C31 group at 60 MPa.
KW - Crude oil
KW - Effect of temperature
KW - Supercritical CO
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U2 - 10.1016/j.jcou.2018.02.009
DO - 10.1016/j.jcou.2018.02.009
M3 - Article
AN - SCOPUS:85042479763
SN - 2212-9820
VL - 24
SP - 471
EP - 478
JO - Journal of CO2 Utilization
JF - Journal of CO2 Utilization
ER -