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

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13.11 Relationship between McCabe-Thiele and Triangular Diagrams for Partially Miscible Systems

Stepping off a lot of stages on a triangular diagram can be difficult and inaccurate. More accurate calculations can be done with a McCabe-Thiele diagram. Since total flow rates are not constant, the triangular diagram and the Δ point are used to plot a curved operating line on the McCabe-Thiele diagram. This construction is illustrated in Figure 13-26 for a single point. For any arbitrary operating line (which must go through Δ), the values of the extract and raffinate concentrations of passing streams (yA,op, xA,op) are easily determined. These concentrations must represent a point on the operating line in the McCabe-Thiele diagram. Thus, the values ...

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