Fenske-Underwood equation

Fenske-Underwood equation

[¦fen·skē ′ən·dər‚wu̇d i‚kwā·zhən]
(chemical engineering)
Equation in plate-to-plate distillation-column calculations relating the number of theoretical plates needed at total reflux to overall relative volatility and the liquid-vapor composition ratios on upper and lower plates. Also known as Fenske equation.
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