The extraction process shown Figure 8.45 is conducted in a multiple-feed, countercurrent unit without extract or raffinate reflux. Feed F' is composed of solvent and

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The extraction process shown Figure 8.45 is conducted in a multiple-feed, countercurrent unit without extract or raffinate reflux. Feed F' is composed of solvent and solute, and is an extractphase feed. Feed F" is composed of unextracted raffinate and solute and is a raffinate-phase feed. Derive the equations required to establish the three reference points needed to step off the theoretical stages in the extraction column. Show the graphical determination of these points on a right-trianglegraph.

F' F

F' F" m-1 m+1 p-1 -1 p+1 Figure 8.45 Data for Exercise 8.19.

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