Discussion
Oil content and residual oil for four processing routes on the same seed.
| Route | Seed oil (per cent) | Residual in cake or meal (per cent) | Recovery (per cent) |
|---|---|---|---|
| Ghani | 42 | 12.0 | 76 |
| Screw press | 42 | 7.0 | 89 |
| Pre-press then solvent | 42 | 0.8 | 98.5 |
| Direct solvent | 42 | 1.5 | 97 |
Which route gives the highest recovery, and why is direct solvent not used here?
Answer: A
Correct answer: Pre-press then solvent, as 42 per cent floods an extractor
The recovery column settles the first half: pre-press then solvent gives 98.5 per cent, above direct solvent at 97 and far above the two pressing routes.
The second half is the reason direct solvent is not chosen here despite its own good figure. A material carrying 42 per cent oil releases so much liquid that the bed floods and the miscella will not percolate, so the 97 per cent in the table could not actually be achieved on this seed. Pressing first brings the oil down to 15 to 20 per cent, leaving a cake the extractor can handle.
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