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Simulation and Experiment for Separation of Cyclohexane -Isopropanol Azeotropic Mixture

Author: SongYa
Tutor: GaoRuiZuo
School: Tianjin University
Course: Pharmaceutical Engineering
Keywords: Cyclohexane Isopropanol Process simulation Pressure swing distillation Distillation energy efficiency
CLC: TQ028.31
Type: Master's thesis
Year: 2009
Downloads: 82
Quote: 0
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Abstract


In the chemical and pharmaceutical industries , often produce large amounts of a mixed solution of cyclohexane and isopropanol . Of cyclohexane and isopropanol are excellent solvents and raw materials, if it is directly discharged , will not only cause environmental pollution , and also generate waste , both will therefore be separated and recovered with great significance . Under normal conditions , form an azeotrope of cyclohexane and isopropanol , can not be isolated using ordinary distillation method of this research using special rectification method for separating cyclohexane - isopropanol azeotrope processes. The main subject of the use of chemical process simulation software Aspen Plus 2006 for Cyclohexane - Department of isopropanol azeotrope existing separation method and pressure swing distillation separation method steady-state process simulation, the total number of theoretical plates , reflux ratio the feed location of the feed temperature and other operating parameters are optimized . Existing methods of separation ordinary distillation, extractive distillation process simulation, the steady-state process of extractive distillation select glycol as an extraction agent , the tower of the process operating parameters were optimized , the concentration of cyclohexane and isopropanol 99.9 wt % ; steady-state process for pressure swing distillation , vacuum tower feed (including atmospheric tower back decompression cycle logistics of the tower feed and raw material feed ) , the temperature of the separation process affect the final optimization of process operation parameters , the product concentration can reach 99.9% by weight . The experimental process of the the cyclohexane - isopropanol azeotrope transformer distillation separation process . Respectively by batch distillation vacuum tower and atmospheric tower part of the experiment , the experimental results agree well with the simulation results . The salt LiCl concentration of reagents in the vacuum tower circulating material in the feed pressure swing distillation to 0.08 g / ml , the column top distillate of the difference in isopropanol content in the liquid can be increased to 11.47 wt % , the total energy consumption is only for 48.2% of the original . Simulation and experimental results show that the pressure swing distillation separation azeotrope process is simple and does not introduce additional impurities , as well as high energy consumption of less than . In the final pressure swing distillation energy through heat integration process and the salt effect change azeotropic composition , to achieve the purpose of saving energy .

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CLC: > Industrial Technology > Chemical Industry > General issues > Chemical processes ( physical processes and physical and chemical processes ) > Separation process > Single-phase system liquid mixture separation process > Distillation and rectification
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