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Petroleum-free extraction of oil from soybeans with supercritical CO2

  • Technical
  • Published:
Journal of the American Oil Chemists’ Society

Abstract

Full-fat soyflakes are readily extracted with supercritical carbon dioxide (SC-CO2) at pressures of 3,000~10,000 psig and 50 C. Under these conditions, SC-CO2 has the density of a liquid and the diffusivity of a gas. Therefore, equilibrium solubility is readily achieved in a short-path batch extractor which permits high gas flow rates. Soybean oil extracted with SC-CO2 is lighter in color and contains less iron and about one-tenth the phosphorus of hexane-extracted crude oil from the same beans. The lower phosphorus content is reflected in a chromatographic refining loss of 0.6% compared to 1.9% for hexane crude. Refined oils from hexane and SC-CO2 extraction had equivalent odor and flavor scores initially and after 4 days' storage at 60 C. Carbon dioxide, an ideal solvent for extraction of food products, is low-cost and readily available from fermentation processes and could free over 20 million gallons of costly hexane per year for essential energy uses.

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Authors and Affiliations

  1. Northern Regional Research Center, ARS, USDA, 61604, Peoria, IL

    J. P. Friedrich, G. R. List & A. J. Heakin

Authors
  1. J. P. Friedrich
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  2. G. R. List
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  3. A. J. Heakin
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Friedrich, J.P., List, G.R. & Heakin, A.J. Petroleum-free extraction of oil from soybeans with supercritical CO2 . J Am Oil Chem Soc 59, 288–292 (1982). https://doi.org/10.1007/BF02662228

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  • DOI: https://doi.org/10.1007/BF02662228

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