Discussion
Statement I: Thinner flakes always give better solvent extraction.
Statement II: A thinner flake shortens the path the solvent and oil must travel.
In the light of the above statements, choose the correct answer.
Answer: B
Correct answer: Statement I is incorrect but Statement II is correct
The second statement is sound as far as it goes: a thinner flake does shorten the diffusion path. But "always" makes the first statement false.
Below about 0.25 to 0.3 mm the flake loses its mechanical integrity, breaking into fines that blind the percolation bed and stop the miscella draining through it. Extraction then gets worse, not better, and the miscella carries solids that must be removed downstream. Flake thickness is an optimum rather than a minimum - a good illustration of a variable that helps up to a point and then reverses.
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