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

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9.5.1 Constant Reflux Ratio

The most common operating method is to use a constant reflux ratio and allow xD to vary. This procedure corresponds to a simple batch operation where xD also varies. The relationship between xD and xW can now be found from a stage-by-stage calculation using a McCabe-Thiele analysis. Operating Eq. (9-26) is plotted on a McCabe-Thiele diagram for a series of xD values. Then we step off the specified number of equilibrium contacts on each operating line starting at xD to find the xW value corresponding to that xD. This procedure is shown in Figure 9-5 and Example 9-2.

Figure 9-5. McCabe-Thiele diagram for multistage batch distillation with constant L/D, Example 9-2

The McCabe-Thiele analysis gives xW values for a series ...

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