Discussion
A processor is deciding how to treat soybean at 20 per cent oil and groundnut at 45 per cent oil.
Which arrangement is appropriate?
Answer: B
Correct answer: Direct for the soybean, pre-press for the groundnut
The oil content decides the route. Soybean at 20 per cent goes directly to solvent extraction: the flakes hold their structure, the bed drains, and residual oil below one per cent is reached in a single stage.
Groundnut at 45 per cent would flood the extractor, releasing so much oil that the bed will not percolate. It is therefore pressed first to about 15 to 20 per cent and the cake then solvent extracted. Pressing alone would leave 5 to 8 per cent oil behind in both, and pre-pressing the soybean would add a stage for no gain.
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