Discussion
The mixture of oil and solvent leaving a solvent extractor is called _____.
Answer: D
Correct answer: miscella
Miscella is the solution of oil in solvent leaving the extractor, typically 25 to 30 per cent oil in hexane. It goes to a distillation train where the solvent is evaporated and condensed for reuse, leaving crude oil.
The other three belong elsewhere in the process: soapstock is the soap-rich stream from alkali neutralisation, gums are the phospholipids removed in degumming, and foots is the sediment settling from crude oil on standing. Only miscella contains solvent, which is enough to identify it.
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