Ponchon-Savarit Method Home -> Solved Problems -> Mass Transfer -> 1000 kg/hr of a mixture containing 42 mole percent heptane and 58 mole percent ethyl benzene is to be fractionated to a distillate containing 97 mole percent heptane and a residue containing 99 mole percent ethyl benzene using a total condenser and feed at its saturated liquid condition. The enthalpy-concentration data for the heptane-ethyl benzene at 1 atm pressure are as follows: x heptane 0 0.08 0.18 0.25 0.49 0.65 0.79 0.91 1.0 y he ptane 0 0.28 0.43 0.51 0.73 0.83 0.90 0.96 1.0 H l (kJ/kmol) x 10 -3 24.3 24.1 23.2 22.8 22.05 21.75 21.7 21.6 21.4 H v (kJ/kmol) x 10 -3 61.2 59.6 58.5 58.1 56.5 55.2 54.4 53.8 53.3 Calculate the following: Minimum reflux ratio a. Minimum number of stages at total reflux b. Number of stages at reflux ratio of 2.5 c. Condenser duty d. Reboiler duty e. Calculations: Heptane = C 7 H 16 Ethyl benzene = C 6 H 5 C 2 H 5 Average molecular weight of feed solution = 0.42 x 100 + 0.58 x 106 = 103.48 Molal flow rate of feed, F = 1000/103.48 = 9.9937 kmol/hr The H-x-y diagram is constructed with the above data as given below: Ponchon-Savarit Method - Mass Transfer Solved Problems - msubbu http://www.che.iitm.ac.in/~ch04d017/sp/mt/Ponchon-Savarit.htm 1 of 5 28/11/2011 9:28 PM Create PDF files without this message by purchasing novaPDF printer (http://www.novapdf.com)
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Ponchon-Savarit Method
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1000 kg/hr of a mixture containing 42 mole percent heptane and 58 mole percent ethyl benzene is to be fractionated to adistillate containing 97 mole percent heptane and a residue containing 99 mole percent ethyl benzene using a total condenserand feed at its saturated liquid condition. The enthalpy-concentration data for the heptane-ethyl benzene at 1 atm pressureare as follows:
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