Abstract
The solubilities of lauric, linoleic, myristic, oleic, palmitic and stearic acid in supercritical carbon dioxide (SC-CO2) at different pressures and temperatures were measured. The solubility values obtained in this work were compared with previously published data, and possible causes for observed discrepancies were discussed. The solubilities of the six fatty acids were modeled by Chrastil’s equation, and estimated model parameters were used to plot the solubility isotherms of fatty acids at 313, 323 and 333°K (40, 50 and 60°C) as a function of SC-CO2 density. The comparison of solubility isotherms of fatty acids and vegetable oil suggests that separation of fatty acids from triglycerides might be possible by using SC-CO2 at densities less than 700 kg/m3. From the effect of temperature on fatty-acid and vegetable-oil solubility, it seems that the extraction yield could be increased without sacrificing the selectivity of SC-CO2 for fatty acids by choosing a higher operating temperature. The data also suggest that fractionation of certain fatty acids might be possible by manipulating the processing conditions. Given the values of the constants, Chrastil’s equation could serve as a guideline for choosing appropriate processing conditions and predicting the effect of pressure and temperature of SC-CO2 on solute solubility.
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References
Temelli, F., R. Braddock, C.S. Chen and S. Nagy, inSupercritical Fluid Extraction and Chromatography, edited by B.A. Charpentier and M.R. Sevenants, ACS Symposium Series 366, American Chemical Society, Washington, D.C., 1988, p. 109.
Krukonis, V.J., in p. 26.
Nilsson, W.B., E.J. Gauglitz, Jr., J.K. Hudson, V.F. Stout and J. Spinelli,J. Am. Oil Chem. Soc. 65:109 (1988).
Nilsson, W.B., E.J. Gauglitz, Jr., and J.K. Hudson,:87 (1991).
Brunner, G., and S. Peter,Ger. Chem. Eng. 5:181 (1982).
Brunetti, L., A. Daghetta, E. Fedeli, I. Kikic and L. Zanderighi,J. Am. Oil Chem. Soc. 66:209 (1989).
Goncalves, M., A.M.P. Vasconcelos, E.J. S. Gomes de Azevedo, H.J. Chaves das Neves and M. Nunes da Ponte,:474 (1991).
Chrastil, J.,J. Phys. Chem. 86:3016 (1982).
del Valle, J.M., and J.M. Aguilera,Ind. Eng. Chem. Res. 27:1551 (1988).
White, T.M.,Solubilities of Selected Fatty Acids in Supercritical Carbon Dioxide, M.S. Thesis, University of Wisconsin, Madison, 1990.
Maheshwari, P.,Applications of Supercritical Carbon Dioxide Technology in Soybean Processing, M.S. Thesis, Iowa State University, Ames, 1991.
Nikolov, Z.L., P. Maheshwari, J.E. Hardwick, P.A. Murphy and L.A. Johnson, inFood Science and Human Nutrition, edited by G. Charalambous, Elsevier, Amsterdam, The Netherlands, 1992, p. 595.
Bamberger, T., J.C. Erickson, C.L. Cooney and S.K. Kumar,J. Chem. Eng. Data 33:327 (1988).
McHugh, M.A., and V.J. Krukonis,Supercritical Fluid Extraction—Principles and Practices, Butterworth, Boston, 1986, p. 71.
Ohgaki, K., I. Tsukahara, K. Semba and T. Katayama,Kagaku Kogaku Ronbunshu 13:298 (1987).
Kramer, A., and G. Thodos,J. Chem. Eng. Data 34:184 (1989).
Foster, N.R., S.L.J. Yun and S.S.T. Ting,J. Supercrit. Fluids 4:127 (1991).
King, M.B., D.A. Alderson, F.H. Fallah, D.M. Kassim, K.M. Kassim, J.R. Sheldon and R.S. Mahmud, inChemical Engineering at Supercritical Fluid Conditions, edited by M.E. Paulaitis, J.M.L. Penninger, R.D. Gray, Jr. and P. Davidson, Ann Arbor Science Publishers, Ann Arbor, 1983, p. 31.
Zou, M., Z.R. Yu, P. Kashulines and S.S.H. Rizvi,J. Supercrit. Fluids 3:23 (1990).
Dobbs, J.M., J.M. Wong, R.J. Lahiere and K.P. Johnston,Ind. Eng. Chem. Res. 26:56 (1987).
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Maheshwari, P., Nikolov, Z.L., White, T.M. et al. Solubility of fatty acids in supercritical carbon dioxide. J Am Oil Chem Soc 69, 1069–1076 (1992). https://doi.org/10.1007/BF02541039
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DOI: https://doi.org/10.1007/BF02541039