Chemical Engineering > GATE 2018 > Optimization
The Annual Fixed Charges (AFC) and Annual Utilities Costs (AUC) of a distillation column being designed are expressed in terms of the reflux ratio (R) as
The reflux ratio (Ropt) for optimizing the total cost of the distillation column may be found by solving
A
1282×Ropt-1796-1/(Ropt-1.16)2=0
B
62.5+1282×Ropt-1796-1/(Ropt-1.16)2=0
C
80+62.5×Ropt+641×Ropt2-1796×Ropt+1287+1/(Ropt-1.16)=0
D
80+62.5×Ropt-641×Ropt2+1796×Ropt-1287-1/(Ropt-1.16)=0

Correct : b

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