If \(100 \mathrm{~kg}\) of a cottonseed oil-oleic acid solution containing \(25 \mathrm{wt} \%\) acid is extracted twice in crosscurrent fashion, each time with \(1000 \mathrm{~kg}\) of pure propane, determine the compositions (wt\%) and the weights of the mixed extract and the

final raffinate. Make the computations on a solvent-free basis using the Janecke diagram generated in Problem 7.17.

Problem 7.17:-

Generate the Janecke diagram and the distribution curve for the system cottonseed oil (A)-propane (B)-oleic acid (C) at \(372 \mathrm{~K}\) and \(42.5 \mathrm{~atm}\).

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Table 7.8 Equilibrium Tie-Line Data for System Cottonseed Oil (A)-Propane (B)-Oleic Acid (C) at 372 K and 42.5 Atm Oil Propane Acid Oil Propane Acid 63.5 36.5 0.0 2.30 97.7 0.00 57.2 37.3 5.5 1.95 97.3 0.76 52.0 39.0 9.0 1.78 97.0 1.22 42.7 39.5 13.8 1.50 96.6 1.90 39.8 41.5 18.7 1.36 95.9 2.74 31.0 42.7 26.3 1.20 95.0 3.80 26.9 43.7 29.4 1.10 94.5 4.40 21.0 46.6 32.4 1.00 93.9 5.10 14.2 48.4 37.4 0.80 93.1 6.10 8.3 52.2 39.5 0.70 92.1 7.20 4.5 54.4 41.1 0.40 93.5 6.10 0.8 55.5 43.7 0.20 94.3 5.50 Source: Data from Treybal (1980).