Discussion
Three of the following raise extraction efficiency. Which lowers it?
Rolling flakes thin enough to crumble
Dehulling the seed
Cooking to thin the oil
Countercurrent solvent contact
Answer: D
Fines block percolation and slow the extractor badly, so there is a limit below which thinner flakes stop helping. The other three all improve either the driving force or the condition of the material presented to the solvent.
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