Simulation and Optimization Separation of Isopropanol and Water with Azeotropic Distillation Based on Aspen Plus
Through Aspen Plus simulation calculation,cyclohexane was selected as the azeotrope of isopropanol dehydration from benzene,cyclohexane and diisopropyl ether.The azeotropic rectification column and purification column of isopropyl alcohol-water-cyclohexane ternary azeotropic system were optimized using Aspen Plus sensitivity analysis function.The optimal process parameters of the azeotropic rectification column are as follows:the theoretical number of plates is 22,the optimal feeding position is the 10th theoretical plate,and the operation under atmospheric pressure.The optimal process parameters of the purification column are as follows:the theoretical number of plates is 10,the output from the top of the tower is 10 kmol/h,and the operation is under normal pressure.Based on the optimal process parameters of the azeotropic rectification column and purification column,the whole process was simulated.The results showed that the mole purity of isopropyl alcohol at the bottom of azeotropic rectification column was 99.72%and the mole flow rate was 24.85 kmol/h;the mole purity of water at the bottom of purification column was 99.71%and the mole flow rate was 55.65 kmol/h,and the supplement amount of the azeotrope was 0.033 6 kmol/h.
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