Discussion
Consider the following statements about solvent extraction:
1. Hexane is the usual commercial solvent.
2. Countercurrent contact maintains a driving force at every stage.
3. The miscella is the spent meal leaving the extractor.
Which of the statements given above is or are correct?
Answer: D
Correct answer: 1 and 2 only
The first two are correct. Hexane is the usual commercial solvent, chosen for its selectivity for oil, low boiling point and ease of recovery; and countercurrent contact keeps a concentration difference at every stage, fresh solvent meeting the most nearly exhausted flakes.
The third misnames a stream. Miscella is the oil and solvent solution leaving the extractor and going to distillation. The spent meal is the solid, which goes to a desolventiser-toaster to have its residual hexane driven off before becoming animal feed.
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