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The number of plates at total reflux. Fenske's method

For conditions in which the relative volatility is constant, Fenske(29) derived an equation for calculating the required number of plates for a desired separation. Since no product is withdrawn from the still, the equations of the two operating lines become:

If for two components A and B, the concentrations in the still are xsA and xsB, then the composition on the first plate is given by:

XA xb/1

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