5 - Example Acetone vapor is considered toxic to the...

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Example Acetone vapor is considered toxic to the environment. As an engineer in the chemical plant, you are asked to design an acetone recovery system having the flow sheet illustrated in the next page. To make the calculation simpler, all concentrations of both gases and liquids are in presented in weight (mass) percent (normally, for gas phase, the concentration is presented in “volume” and “mole” basis) Calculate the values of A , F , W , B , and D in kg per hour, if given G = 1,400 kg/h
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Absorber column Distillation Column Condenser Water (100%) W kg/h Air A kg/h Air 99%) Water 0.5% Feed G kg/h Acetone 3.0 % Air 95.0% Water 2.9 % F kg/h Acetone 19.0 % Water 81.0% Bottom B kg/h Acetone 4.0 % Water 96.0% Distillate D kg/h Acetone 99.0 % Water 1.0%
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Basis: 1 h of operation Hence, from the basis, G = 1,400 kg , and the “ Feed ” stream contains Acetone: 3.0/100 x (1,400) = 42 kg Air: 95.0/100 x (1,400) = 1,330 kg Water: 2.0/100 x (1,400) = 28 kg
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Consider the I unit – Absorber column Water (100%) W kg/h Feed G kg/h Acetone 3.0 % Air 95.0% Water 2.9 % Air A kg/h Air 99%) Water 0.5% F kg/h Acetone19.0 % Water 81.0% Absorber Column
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G + W = A + F 1,400 + W = A + F xF x 100 19 1400 100 0 . 3 = Acetone balance Performing a species balance for acetone yields (y a0 ) (G) = ( y af ) (F) Over all balance F = 221.1 kg Air Balance (ya0) (G) = ( yaf ) (F) xA x 100 5 . 99 1400 100 0 . 95 = A = 1,336.7 kg
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Substituting the values of F and A in overall equation 1400 + W = 1336.7 + 221.1 W = 157.8 kg Balance around Absorber unit are W = 157.8 kg A = 1336.7 kg F = 221.1 kg Still D and B are unknown ?????
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5 - Example Acetone vapor is considered toxic to the...

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