The design and optimization procedures of a heterogeneous thermally coupled azeotropic distillation sequence with a side stripper (TCADS-SS) for the purification of isopropanol has been investigated. The proposed procedures can detect the optimal values of the design variables and thereby guarantee the minimum energy consumption, which is related to the minimum CO2 emissions and the lowest total annual cost (TAG). The procedures are applied to the study of the separation of azeotropic mixtures using the two distillation sequences. In the TCADS-SS, the top end of the side stripper has both liquid and vapor exchange with the main column, which eliminates a condenser in contrast with the conventional heterogeneous azeotropic distillation sequence (CHADS). The results show that not only reductions in energy consumption and CO2 emissions but also higher thermodynamic efficiency can be obtained for the TCADS-SS.

Super float valve(SFV)tray is a new type of trays developed by China University of Petroleum. SFV tray was designed with many innovation and optimization for valve structures combining the advantages of guide rectangular valve tray and micro V-grid fixed valve. The hydraulic and mass transfer performances of SFV were investigated with an air-water-oxygen system in a stainless steel column of φ1200 mm in comparison with the traditional F1 tray. Experimental results showed that SFV has pressure drop lowered by 10%—20%,weeping rate lowered by 20%—30%,entrainment lowered by 20% and mass transfer efficiency increased by 10%—20% as compared with F1. The industrial application showed that the high performance SFV tray could be used to the design and restoration of columns.

提出了一种应用反应精馏隔壁塔把乙酸甲酯废液处理成乙酸正丁酯的新工艺流程,即采用反应精馏隔壁塔替代常规流程中的反应精馏塔及甲醇回收塔.利用Aspen Plus模拟软件对反应精馏隔壁塔及常规流程进行了模拟,考察了进料位置、反应段位置及高度、耦合位置等结构参数对反应精馏隔壁塔的影响,并在保证产品纯度的前提下对反应精馏隔壁塔进行了最优化分析.分析结果显示反应精馏隔壁塔可以节能17.34%,并能有效降低设备投资费用和操作费用.

Control strategy of reactive distillation in dividing wall column for hydrolysis of methyl acetate was studied on base of steady state simulation. The control strategy of reactive distillation dividing wall column was first studied through steady state sensitive analysis, the temperature relative gain of each tray were obtained. Then for the sake of reducing the interaction among various variables, the non square relative gain matrix method was used to select the temperature control trays, and the relative gain matrix method was used to couple the manipulated variables and controlled variables. The parameters of proportional integral(PI) controller were attained by relay feedback tests, and then the control strategy was simulated on platform of Aspen Dynamics. The simulation results showed that the PI control scheme with three temperature loops(water feed flow rate controlled the temperature of 28th plate of the main column, reboiler load of main column controlled the temperature of 21th plate of the main column, and reflux flow rate of rectifier controlled the temperature of 11th plate of the side rectifier)could achieve reasonable control performance and stoichiometric balance between reactants, and composition disturbances of the two desired products were all less than 0.01%.

Aspen Plus is a market-leading process modeling tool for Process Engineering applications.The paper introduced a way of applying the Aspen Plus process simulation software to the Course Design of Chemical Engineering Principle according to years of practice teaching.Practical experience showed that the application of Aspen Plus made course design more close to engineering reality and was helpful to the combination of practice and teaching,can not only foster students’ interest and engineering consciousness,enhance design efficiency and quality,but also extend the scope of subjects selected.