In Example 4.9, 83.25% of the oil in soybeans is leached by benzene using a single equilibrium

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In Example 4.9, 83.25% of the oil in soybeans is leached by benzene using a single equilibrium stage. Calculate the percent extraction of oil if:
(a) Two countercurrent equilibrium stages are used to process 5,000kgh of soybean meal with 5,000kglh of benzene.
(b) Three countercurrent equilibrium stages are used to process the same flows as in part (a).
(c) Also, determine the number of countercurrent equilibrium stages required to extract 98% of the oil if a solvent rate of twice the minimum value is used.
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