A 2000 kg batch of pyridine-water solution, 50% pyridine, is to be extracted with an equal
weight of chlorobenzene. The raffinate from the first extraction is to be reextracted with
a weight of solvent equal to raffinate weight, and so on (B2 = R1, B3 = R2, etc). How many
theoretical stages and what total solvent will be required to reduce the concentration of
pyridine to 2% in the final raffinate? Solve on triangular coordinates.
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