【作者】 汪亮； 刘广杰； 孙晓岩； 王建平； 项曙光；

【Author】 Wang Liang;Liu Guangjie;Sun Xiaoyan;Wang Jianping;Xiang Shuguang;Process Systems Engineering Institute, Qingdao University of Science and Technology;Petro-Cyber Works Information Technology Co.Ltd Shanghai Branch;

【机构】 青岛科技大学过程系统工程研究所； 石化盈科信息技术有限责任公司上海分公司；

【摘要】 反应精馏作为过程强化的一种技术手段,其稳态模拟对于过程研究与优化具有重要作用。首先,基于反应精馏的过程原理,建立反应精馏的数学模型。在总结模拟普通精馏的求解算法的基础上,增加化学反应速率方程,采用内外层算法求解反应精馏过程。其次,对近似热力学模型K值的计算提出改进,简化K值模型的计算,并提出化学反应程度初值的估计方法。模型分为两层迭代求解,外层采用严格的热力学模型计算相平衡常数和汽液相焓值,并拟合得到近似热力学模型的参数,内层采用近似热力学模型求解MESHR方程。最后,以乙酸异丙酯反应精馏塔和乙烯流程中的高压脱丙烷塔对反应精馏模型进行验证,将计算结果与国外著名化工模拟软件Aspen Plus进行比较,结果表明,各塔板的温度、汽液相流量和组成的相对误差均较小,证明所开发的反应精馏数学模型计算结果准确可靠,可用于反应精馏工业过程的模拟和优化。更多还原

【Abstract】 Reactive distillation is a technical means of process strengthening, and its steady-state simulation plays an important role in process research and optimization. Firstly, based on the process principle of reactive distillation, the mathematical model of reactive distillation is established. On the basis of summarizing the algorithm for simulating ordinary distillation, the equation of chemical reaction rate is increased, and the Inside-Out method is used to solve the reactive distillation process. Secondly, proposed a modified simplify K model of the approximate thermodynamic model, simplify the calculation of the K model,and raised the estimation method of the initial value of the chemical reaction. The model is divided into two layers of iterative solution. The outer layer uses a strict thermodynamic model to calculate the phase equilibrium constant and the vapor-liquid enthalpy value, and the parameters of the approximate thermodynamic model are fitted. The inner layer uses the approximate thermodynamic model to solve the MESHR equation. Finally, the reactive distillation model was verified by the high-pressure depropanation tower in ethylene process and the isopropyl acetate reaction distillation column. The calculation results were compared with the well-known foreign chemical simulation software Aspen Plus. The results showed that the relative errors of the temperature, vapor-liquid phase flow and composition of each stage are small, which proves that the mathematical model of reactive distillation is accurate and reliable, and the mathematical model can be used for simulation and optimization of reactive distillation industrial process.更多还原