Discussion
Dehulling is carried out before extraction in order to
Answer: C
Correct answer: Raise the oil content of the feed
Hulls carry very little oil, so removing them concentrates the oil in what remains - the feed to the press or extractor is richer, and the same plant handles more oil for the same throughput of material.
There is a second gain: hulls are absorbent and would retain oil during processing, so removing them reduces the loss in the cake as well as raising the yield. Free fatty acids are removed in neutralisation, colour in bleaching, and moisture is set during conditioning - all later steps with quite different purposes.
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