EXPERIMENTAL STUDIES AND DISCRETE THERMODYNAMIC MODELING ON SUPERCRITICAL CO<SUB>2</SUB> EXTRACTIONS OF A HEXANDECANE AND CRUDE OIL

Hwang J; Kim CH; Lim GB

Korean Journal of Chemical Engineering, Vol.12, No.2, 244-250, April, 1995

EXPERIMENTAL STUDIES AND DISCRETE THERMODYNAMIC MODELING ON SUPERCRITICAL CO₂ EXTRACTIONS OF A HEXANDECANE AND CRUDE OIL

Hwang J, Kim CH, Lim GB

Continuous multiple-contact experiments using a supercritical CO₂ were performed to study the phase equilibrium behavior of the dynamic extractions of a hexadecane and crude oil. The extraction yields increased as CO₂ density increased with a pressure rise at constant temperature. The rates of extractions were also greater at higher pressure. The simulated distillation analysis of extracted crude oil samples represented that the earlier extracts contained lighter compounds and the latter extracts contained progressively heavier compounds. These compositional changes occurring during a dynamic extraction were also ascertained by phase-equilibrium flash calculations using the equations of state and a pseudo-component lumping method. Two different equations of state, Soave-Redlich-Kwong and Peng-Robinson, were used to predict the equilibrium compositions of the extract phase that is a supercritical carbonic phase. The results of phase behavior calculations established the nature of the extraction and partitioning process as a function of time. These results also provided reasonable agreement between the experimental data and the calculated values.

Keywords:SFE;Supercritical CO₃ Hexadecane;Crude Oil;Madeling;Phase Equilibrium Calculation;Pseudo-components;Lumping;EOS

[References]

Brennecke JF, Eckert CA, AIChE J., 35(9), 1409 (1989)
Ely JF, Baker JK, "A Review of Supercritical Fluid Extraction," NBS Technical Note 1070, U.S. Dept. of Commerce, National Bereau of Standards (1983)
Firoozabadi A, Nutakki R, Wong TW, Aziz K, Soc. Pet. Eng. J., 3, 673 (1988)
Holm LW, Josendal VA, Soc. Pet. Eng. J., 22, 187 (1982)
Katz DL, Firoozabadi A, J. Pet. Tech., 30, 1649 (1978)
Kehlen H, Ratzsch MT, Bergmann J, AIChE J., 31(7), 1136 (1985)
Kesler MG, Lee BI, Hydrocarb. Process., 55, 153 (1976)
Mulliken CA, Sandler SI, Ind. Eng. Chem. Process Des. Dev., 19, 709 (1980)
Mungan N, J. Can. Pet. Technol., 20, 87 (1981)
Ngheim LX, Aziz K, Li YK, Soc. Pet. Eng. J., 23, 521 (1983)
Nutakki R, "Phase Behavior Calculations for Systems with Hydrocarbons, Water, and CO₂," Ph.D. Dissertation, Stanford University, Stanford, CA (1989)
Orr FM, Silva MK, Lien C, Soc. Pet. Eng. J., 23, 281 (1983)
Peng DY, Robinson DB, Ind. Eng. Chem. Fundam., 15, 59 (1976)
Ratzsch MT, Kehlen H, Schumann J, Chem. Eng. Commun., 71, 113 (1988)
Reid RC, Prausnitz JM, Sherwood TK, "Properties of Liquids and Gases," 3rd ed., McGraw-Hill, New York (1977)
Riazi MR, Daubert TE, Ind. Eng. Chem. Res., 26, 755 (1987)
Shelton JL, Yarborough L, J. Pet. Technol., 16, 1171 (1977)
Sheng W, Lu BC, AOSTRA J. Res., 6, 221 (1990)
Soave G, Chem. Eng. Sci., 27, 1197 (1972)
Turek EA, Metcalfe RS, Yarborough L, Robinson RL, Soc. Pet. Eng. J., 24, 308 (1984)
Twu CH, Fluid Phase Equilib., 16, 137 (1984)
Whitson CH, Soc. Pet. Eng. J., 23, 683 (1983)

[Referenced By]

[1] Brennecke JF, Eckert CA, AIChE J., 35(9), 1409 (1989)

[2] Ely JF, Baker JK, "A Review of Supercritical Fluid Extraction," NBS Technical Note 1070, U.S. Dept. of Commerce, National Bereau of Standards (1983)

[3] Firoozabadi A, Nutakki R, Wong TW, Aziz K, Soc. Pet. Eng. J., 3, 673 (1988)

[4] Holm LW, Josendal VA, Soc. Pet. Eng. J., 22, 187 (1982)

[5] Katz DL, Firoozabadi A, J. Pet. Tech., 30, 1649 (1978)

[6] Kehlen H, Ratzsch MT, Bergmann J, AIChE J., 31(7), 1136 (1985)

[7] Kesler MG, Lee BI, Hydrocarb. Process., 55, 153 (1976)

[8] Mulliken CA, Sandler SI, Ind. Eng. Chem. Process Des. Dev., 19, 709 (1980)

[9] Mungan N, J. Can. Pet. Technol., 20, 87 (1981)

[10] Ngheim LX, Aziz K, Li YK, Soc. Pet. Eng. J., 23, 521 (1983)

[11] Nutakki R, "Phase Behavior Calculations for Systems with Hydrocarbons, Water, and CO₂," Ph.D. Dissertation, Stanford University, Stanford, CA (1989)

[12] Orr FM, Silva MK, Lien C, Soc. Pet. Eng. J., 23, 281 (1983)

[13] Peng DY, Robinson DB, Ind. Eng. Chem. Fundam., 15, 59 (1976)

[14] Ratzsch MT, Kehlen H, Schumann J, Chem. Eng. Commun., 71, 113 (1988)

[15] Reid RC, Prausnitz JM, Sherwood TK, "Properties of Liquids and Gases," 3rd ed., McGraw-Hill, New York (1977)

[16] Riazi MR, Daubert TE, Ind. Eng. Chem. Res., 26, 755 (1987)

[17] Shelton JL, Yarborough L, J. Pet. Technol., 16, 1171 (1977)

[18] Sheng W, Lu BC, AOSTRA J. Res., 6, 221 (1990)

[19] Soave G, Chem. Eng. Sci., 27, 1197 (1972)

[20] Turek EA, Metcalfe RS, Yarborough L, Robinson RL, Soc. Pet. Eng. J., 24, 308 (1984)

[21] Twu CH, Fluid Phase Equilib., 16, 137 (1984)

[22] Whitson CH, Soc. Pet. Eng. J., 23, 683 (1983)