Abstract
The purpose of this study was to investigate the simulation and optimization of extraction distillation process for recovery of high purity methylene chloride (MC) from waste organic solvent using ethylene glycol (EG). NRTL liquid activity coefficient model was adopted for phase equilibrium calculations and PRO/Ⅱ, a commercial process simulator, was used to simulate the extractive distillation process. Based on the analysis results, it turned out that the optimum feed stage for introducing raw materials (Waste organic solvent) into the extractive distillation column (T-01) is the 60th stage. As a result of analyzing the heat duty of re-boiler and the purity of MC, the MC recovery flow rate, the water concentration, etc. to select the optimum feed stage and the optimum inflow flow rate of ethylene glycol (EG), it turned out that the optimum feed stage of EG is the fifth stage and the optimum inflow flow rate of EG is 1,8000 kg/hr. As a result of analyzing the purity of MC and the recovery flow rate of MC according to the reflux ratio of the extractive distillation column (T-01), it was found that when the reflux ratio is 3.5, the purity of methylene chloride could be maintained 0.997 as mass fraction and the recovery flow rate of MC is maximum. As a result of analyzing the optimum feed stage for introducing the heavy stream flowing out from the bottom of the extraction solvent column (T-01) into the solvent recovery column (T-02), it turned out that the optimum feed stage of the heavy stream is the 60th stage. It was analyzed that the optimum distillate to feed ratio (D·F) of the solvent recovery column (T-02) was 0.10 and the optimum reflux ratio is 0.30, respectively.
Published Version
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