1

Fig. 7-6. Optimum reflux ratio.

Feed-plate Location. One step between the equilibrium curve and the operating line for the enriching section corresponds to one theoretical plate in the enriching section above the feed, and one step between the equilibrium curve and the other operating line corresponds to one theoretical plate below the feed. Therefore the step that passes from one operating line to the other corresponds to the feed plate. Thus, in Fig. 7-7j am afcetthe operating line abcl it is noTpossible value of sis less thaW iHevalue corresponding toppint e. However, as soon as the^dhie-xrf-3rte~tess""iFan e, it is possible to shift to the other operating line, but it is not necessary to do so at this value, since steps can be continued down abc until they are pinched in at c, but a value less than c cannot be obtained unless the shift is made. The step from one

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