【作者】 李振华；

【导师】 鄢烈祥；

【作者基本信息】 武汉理工大学 ， 化学工程， 2013， 硕士

【摘要】 碳酸二甲酉(?)(DMC)是重要的有机化工原料之一,是良好的甲基化剂、羰基化剂、羟甲基化剂及甲氧基化剂,具有十分活泼的化学特性,而且DMC无毒无污染、绿色环保,在21世纪具有广阔的应用前景。在这个大背景下,国内DMC的产能迅速扩张。然而,合成DMC过程中甲醇(MeOH)不能完全转化,只能得到粗产品DMC和MeOH共沸混合物,共沸物难以用普通精馏方法分离。因此,研究DMC-MeOH共沸精馏系统,并通过对系统合理的设计和优化从而降低流程的费用、提高DMC产品的收率和质量就更具有实际意义。本文用流程模拟器对DMC-MeOH共沸物的精馏进行严格的模拟分析。然而,由于流程由多个独立的过程单元组成,流程收敛要通过每个过程单元的收敛来实现,这样的流程模拟器特性与基于梯度的优化方法的结合是较困难的。而且,由于过程模型可能出现的非凸非线性特性,优化问题可能存在多个局部最优。对此,本文基于流程模拟器与列队竞争算法的优化方法,来进行DMC-MeOH共沸物精馏过程的优化。本文主要针对精馏流程模拟和流程优化进行研究,主要内容有以下几点：(1)采用Aspen Plus软件对流程进行模拟,并利用软件自带的灵敏度分析对流程进行分析,得到塔设备的最优参数,之后采用Energy Analyzer能量分析工具对换热网络进行设计,得到了较好的换热状态；(2)建立基于Aspen Plus与列队竞争算法的优化软件,以设备折旧费用和操作费用之和的总费用为目标函数,对DMC-MeOH分离的流程进行参数优化。本文对DMC-MeOH共沸精馏的模拟和优化取得了较好的效果,为DMC-MeOH共沸精馏的改造和新工艺流程的设计提供理论依据。更多还原

【Abstract】 Being one of the most important organic chemical raw materials, dimethyl carbonate(DMC) is a kind of favorable methylating agent, carbonylation agent, hydroxyl methylation agent and methoxylation agent. DMC is endowed with very active chemical properties, nontoxicity and green environmental protection, which is of broad application prospects in the21century. Against this general background, the domestic capacity of DMC expands rapidly. However, in the process of DMC synthesis, methanol (MeOH) cannot be completely converted to DMC so the azeotropic mixture of DMC and MeOH is brought about as crude product, which is hard to be separated if use general distillation method. Under this circumstance, the study of the DMC and MeOH azeotropic mixture distillation system, in addition reducing the process costs through the reasonable designing and optimizing and improving the yield as well as the quality of DMC are practically meaningful.The process simulator is used in this paper to strictly simulate and analyze the DMC-MeOH azeotropic mixture. As the process is composed of multiple independent process unit, every process units should be convergent to reach the flow convergence, however, the combination of such process simulator characteristics with the optimization method based on the gradient is difficult. Moreover, since the nonconvex nonlinear characteristics may appear in the process model, the optimization problem may result in multi-local optimization. Therefore, based on process simulator and the optimal method of line-up competition algorithm, the optimization of the DMC-MeOH azeotropic distillation process is implemented in this paper. We use three parts to research the distillation process simulation and the operation optimization.(1)We adopted with Aspen Plus software to simulate the process, analyzed the process using sensitivity analysis tool to obtain the optimal parameters of columns, and then designed the heat exchange network applied with Energy Analyzer tool to gain the preferable heat exchange conditions.(2)We established the integrated platform based on Aspen Plus and line-up competition algorithm, and implemented the optimization of DMC-MeOH separation process.The simulation and optimization of DMC-MeOH azeotropic distillation in this paper achieved good results, which provided a theoretical basis for the renovation and new process design of the DMC-MeOH azeotropic distillation.更多还原