One hundred tons per hour of a feed containing 20 wt% Na2CO3 and the balance insoluble solids is to be leached and washed with water in a continuous, countercurrent system. Assume leaching will be completed in one ideal stage.   It is desired to obtain a final extract containing 15 wt% solute, with a 98% recovery of solute.  The underflow from each stage will contain 0.5 lb solution / lb insoluble solid.  Determine the number of ideal stages.

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
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One hundred tons per hour of a feed containing 20 wt% Na2CO3 and the balance insoluble solids is to be leached and washed with water in a continuous, countercurrent system. Assume leaching will be completed in one ideal stage.   It is desired to obtain a final extract containing 15 wt% solute, with a 98% recovery of solute.  The underflow from each stage will contain 0.5 lb solution / lb insoluble solid.  Determine the number of ideal stages.

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