# 10 - Energy balance III Example 1 A continuous operation...

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Energy balance III

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Example 1 A continuous operation distillation column, operating at 1 atm is to be designed to separate 13620 kg per hr of a solution of benzene and toluene containing 0.4 mass fraction benzene, into an overhead product containing 0.97 mass fraction benzene and bottom product containing 0.98 mass fraction toluene. A reflux ration of 3.5 kg of reflux per kg of product is to be used. The feed will be at boiling point (enthalpy of feed = 40.8 cal/gm) and reflux will be returned to the column at 37.8 °C (enthalpy of reflux liquid = 16 cal/gm). Enthalpy of vapor leaving the column and entering the condenser = 129 cal/gm. Calculate (a) the quantity of top and bottom products (b) the condenser and the reboiler heat load, enthalpy of liquid leaving the reboiler = 48.2 cal/gm
Bottom product Distillate Distillation column F x F = 0.4 V 1 or D (R+1) L or (D x R) q c x D = 0.97 x B = 0.02 q s D B

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Solution: R = Reflux ration =L/D L = Reflux, kg/hr q C = Heat removed in the condenser q S = Heat added to reboiler x = Mass fraction of benzene Steps: Mass Balance Energy balance
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10 - Energy balance III Example 1 A continuous operation...

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