Development of a dynamic simulator for distillation of vapor-liquid-liquid systems with packed columns

本工作的最终目的是开发气-液-液体系精馏的动态模拟器，即填料塔非均相精馏。由于填料塔模拟器需要建立传热传质模型，因此对规整填料塔非均相精馏过程中的传热传质速率进行了测量。基于传热传质模型，开发了全回流条件下填充塔非均相精馏的稳态模拟装置。用该模拟器对填充柱内的浓度和流速进行了预测，与实测值吻合较好。这些研究成果已发表在一份学术期刊上。在此基础上，开发了一种填充塔的非均相精馏稳态模拟装置，该装置采用单进料、顶部和底部产品流动、顶部油相液体回流的方式。研究了操作条件对填料塔分离性能的影响，并采用塔顶装有馏分接收器的规整填料塔进行了间歇精馏实验。研究了塔顶回流液体浓度、全冷凝器凝结水浓度和底部回流液体浓度的动态行为。用塔板动态模拟器对实验数据和预测值进行了对比。基于传热传质模型的间歇精馏动态模拟器的研制工作正在进行中。此外，还将开发一种填充塔非均相精馏的动态模拟器。

The final purpose of the present work is to develop a dynamic simulator for distillation of vapor-liquid-liquid systems, that is, for heterogeneous distillation with packed columns. Since the simulator for packed columns requires heat and mass transfer models, heat and mass transfer rates were measured in heterogeneous distillation with packed columns having structured packing. A steady state simulator for heterogeneous distillation with packed columns under total reflux conditions was developed based on heat and mass transfer models. The predicted concentrations and flow rates in packed columns by the present simulator agreed with the observed ones. Those results have been published in an academic journal. Furthermore, a steady state simulator was developed for heterogeneous distillation by packed columns with one feed flow, top and bottom product flows and reflux of oil phase liquid at the top. The effect of operating conditions on the separation performance of packed columns was studied.On the other hand, the experiments of batch distillation were made by a packed column having structured packing with a distillate receiver at the top of the column. The dynamic behavior of liquid concentrations at top reflux, condensate at total condenser and bottom reflux was studied. The observed data were compared with the predicted values by a dynamic simulator for tray tower.Development of a dynamic simulator for batch distillation based on heat and mass transfer models has been made and will be continued. Furthermore, a dynamic simulator for heterogeneous distillation with packed columns will be developed.