To summarize, oil extraction depends on five basic factors:
o PREPARATION: As we have just discussed.
o SOLVENT: Pure, good quality solvent, with enough flowrate for the tonnage processed, and with a sufficient number of effective countercurrent stages.
o CONTACT: Correctly prepared material with high surface area and good porosity, and a machine providing good contact for effective washing and drainage.
o TIME: Perhaps 30 to 50 minutes for soybeans depending on bed depth, flake thickness and other variables, to allow the dissolving and flow processes to occur.
o TEMPERATURE: Hot enough to maintain rapid extraction in the time available.

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