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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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13.10.3 Complete Partially Miscible Extraction Problem

At this point you should be ready to solve a complete extraction problem.

Example 13-4. Countercurrent extraction

A solution of acetic acid (A) in water (D) is to be extracted using isopropyl ether as the solvent (S). The feed is 1000 kg/h of a solution containing 35 wt % acid and 65 wt % water. The solvent used comes from a solvent recovery plant and is essentially pure isopropyl ether. Inlet solvent flow rate is 1475 kg/h. The exiting raffinate stream should contain 10 wt % acetic acid. Operation is at 20°C and 1 atm. Find the outlet concentrations and the number of equilibrium stages required for this separation. The equilibrium data are given by Treybal (1968) and are reproduced in ...

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