Summary
The extraction process within the oil-bearing substance is described in terms of undissolved oil and static holdup. Undissolved oil is bound in the original material through a slowly soluble resistance that is not re-established by replacing the extracted oil. The rate of solution of the oil is relatively indepenent of the concentration of the extracting solution and is mainly a matter of soaking time. Soaking in anay concentration of miscella below 20% for half the total extraction time required to reduce the undissolved oil to 1% is just as effective as extraction for the entire time with fresh solvent.
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Coats, H.B., Karnosky, G. Solvent extraction. II. The soaking theory of extractions. J Am Oil Chem Soc 27, 51–53 (1950). https://doi.org/10.1007/BF02634878
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DOI: https://doi.org/10.1007/BF02634878