Discussion
Match each extraction method in List I with its typical residual oil in List II.
List I
A. Ghani
B. Screw press
C. Pre-press then solvent
D. Direct solvent extraction
List II
1. About 7 per cent
2. About 12 per cent
3. About 1.5 per cent
4. About 0.8 per cent
Select the correct match.
Answer: A
Correct answer: A-2, B-1, C-4, D-3
The figures rank by how the oil is removed. A ghani presses batchwise at low speed and leaves about 12 per cent - the least efficient. A screw press develops far higher pressure continuously and leaves about 7 per cent.
Both are limited by compression itself, which cannot empty a cellular material. The two solvent routes dissolve the oil instead and reach well under 2 per cent: about 1.5 per cent for direct extraction, and about 0.8 per cent after pre-pressing, the pressed cake extracting more completely than whole flakes of a high-oil seed.
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