The flash curve of the product stream is determined first. This product is completely vaporized below the sidestream draw-off plate. Therefore, the 100% point of the flash curve is used. To determine the partial pressure of the product plus reflux vapor, both of which are of same composition, the lighter vapors are considered inert.
Partial pressure (moles of sidestream + moles of reflux)
r . , = —;--------—-----— x total pressure of side stream (total moles of vapor below plates)
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