Abstract
In this work,the ternary azeotrope of tert-butyl alcohol/ethyl acetate/water is separated by extractive distillation(ED)to recover the available constituents and protect the environment.Based on the conduc-tor like shielding model and relative volatility method,ethylene glycol was selected as the extractant in the separation process.In addition,in view of the characteristic that the relative volatility between com-ponents changes with pressure,the multi-objective optimization method based on nondominated sorting genetic algorithm Ⅱ optimizes the pressure and the amount of solvent cooperatively to avoid falling into the optimal local solution.Based on the optimal process parameters,the proposed heat-integrated pro-cess can reduce the gas emissions by 29.30％.The heat-integrated ED,further coupled with the pervapo-ration process,can reduce gas emission by 42.36％and has the highest exergy efficiency of 47.56％.In addition,based on the heat-integrated process,the proposed two heat pump assisted heat-integrated ED processes show good economic and environmental performance.The double heat pump assisted heat-integrated ED can reduce the total annual cost by 28.78％and the gas emissions by 55.83％compared with the basis process,which has a good application prospect.This work provides a feasible approach for the separation of ternary azeotropes.
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