Problem:
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:
xheptane 0 0.08 0.18 0.25 0.49 0.65 0.79 0.91 1.0
yheptane 0 0.28 0.43 0.51 0.73 0.83 0.90 0.96 1.0
Hl (kJ/kmol) x 10-3 24.3 24.1 23.2 22.8 22.05 21.75 21.7 21.6 21.4
Hv (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
Minimum number of stages at total reflux
Number of stages at reflux ratio of 2.5
Condenser duty
Reboiler duty
Chemical and Biochemical Engineering Homework Solutions
#5987
Distillation and Reflux: Ponchon-Savarit Method
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:
xheptane 0 0.08 0.18 0.25 0.49 0.65 0.79 0.91 1.0
yheptane 0 0.28 0.43 0.51 0.73 0.83 0.90 0.96 1.0
Hl (kJ/kmol) x 10-3 24.3 24.1 23.2 22.8 22.05 21.75 21.7 21.6 21.4
Hv (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:
a. Minimum reflux ratio
b. Minimum number of stages at total reflux
c. Number of stages at reflux ratio of 2.5
d. Condenser duty
e. Reboiler duty
In this problem,
a. Minimum reflux ratio
b. Minimum number of stages at total reflux
c. Number of stages at reflux ratio of 2.5
d. Condenser duty
e. Reboiler duty
have been calculated by using Ponchon-Savarit Method.
The solution is detailed and well presented.
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