Comparison of processes for the supercritical carbon dioxide extraction of oil from soybean seeds
- 187 Downloads
Three different process alternatives for the production of soybean oil by supercritical carbon dioxide extraction were analyzed. The first two processes were organized according to the classical scheme, based on high-pressure extraction followed by separation induced by pressure reduction. Different techniques were used to recover the solvent in these two schemes, in the liquid and in the gas phases, respectively. The third alternative was based on an isobaric scheme—the oil, extracted at high pressure, was separated by chainging the temperature in the separator. In a further improvement, a technique for the heat transfer network integration was added to all the process schemes. The different schemes were used to establish the process configuration that can produce a lower operating cost for soybean oil extraction. Operating costs were considered on an industrial scale to carry out a screening of the different alternatives. The operating cost of these plants were then compared with the hexane extraction process. A substantial reduction in the specific costs was obtained in the case of heat transfer integration, and the operating costs fell in the same range as conventional extraction plants.
Key wordsCarbon dioxide cost comparison processes soybean oil supercritical extraction
Unable to display preview. Download preview PDF.
- 6.Stahl, E., K.W. Quirin and D. Gerard,Verdichtete Gase zur Extraktion und Raffination, Springer-Verlag, Berlin, 1986, p. 91.Google Scholar
- 7.Brown, H.L., B.B. Hamel, and B.A. Hedmann,Energy Analysis of 108 Industrial Processes, The Fairmont Press, Inc., Atlanta, 1985, p. 46.Google Scholar
- 8.Linhoff, B., D.W. Townsend, D. Boland, G.F. Hewitt, B.E.A. Thomas, A.R. Guy and R.H. Marsland,A User Guide on Process Integration for the Efficient Use of Energy, The Institution of Chemical Engineers, England, 1984.Google Scholar
- 9.Eggers, R., and G. Kaschel,Continuous Feed into High Pressure Autoclave by Means of a Screw-Press, Engineering and Food, Vol. 3, edited by W. Spiess, and H. Shubert, Elsevier Science, 1990, p. 415.Google Scholar
- 10.Eggers, R.,J. Am. Oil Chem. Soc. 62:1222 (1985).Google Scholar
- 11.Schwartzberg, H.G.:Design of Continuous, Countercurrent, Solid-Liquid Supercritical Extraction Systems for Solutes in Moist Solids, Proceedings of the 2nd Congress on Fluidi Supercritici e le loro Applicazioni, edited by E. Reverchon, and A. Schiraldi, CUEN, Naples, 1993, pp. 249.Google Scholar
- 12.Treybal, R.E.,Mass Transfer Operation, McGraw Hill, New York, 1980, p. 537.Google Scholar
- 16.Enciclopedie des Gas, Elsevier-L’air Liquide, Amsterdam, 1976. p. 33.Google Scholar
- 17.API Databook, Procedures 6A2.21 and 6A2.22, American Petroleum Institute.Google Scholar
- 18.Sandler, H.J., and E.T. Luckiewicz,Practical Process Engineering, McGraw-Hill, New York, 1987, p. 401.Google Scholar
- 19.Reverchon, E., and L. Sesti Osséo,Impiantistica Italiana V:3 (1992).Google Scholar