Discussion
A processor proposes direct solvent extraction of a 45 per cent oil seed. This is
Answer: B
Correct answer: Inadvisable: such a seed drains poorly
At 45 per cent oil the flakes release so much liquid that the bed floods: the miscella cannot percolate, drainage stops and the extractor cannot work properly.
The route for such a seed is pre-press solvent extraction - press first to bring the oil down to 15 to 20 per cent, then extract the cake, reaching residuals below one per cent. Direct solvent extraction is right for low-oil seeds such as soybean at around 20 per cent, which is why the practice is not standard for all seeds.
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