合成气制乙二醇粗产品提纯工艺的模拟研究

Simulation study on the purification process of crude ethylene glycol product by syngas

本文利用流程模拟软件Aspen Plus对合成气制乙二醇粗产品的提纯工艺进行研究,通过选用合适的热力学方法、分离模块和恰当的分离顺序等对合成气制乙二醇生产过程中产品的提纯工艺进行了模拟研究。运用Aspen中灵敏度分析工具分别对乙二醇分离过程中的脱甲醇塔、中杂塔、脱乙醇塔、脱丁二醇塔系和精制塔等进行模拟和优化,对与乙二醇形成共沸的组分1,2-丁二醇,文中对比了共沸精馏和萃取法两种分离方法,最终选择了分离效率高、能耗小的萃取方法。通过对各个塔的理论塔板数、进料位置以及回流比等参数的模拟确定了其最优操作条件。并基于这些最优操作条件和连续萃取的分离方法,对整个提纯工艺进行了模拟,得到了纯度较高的乙二醇产品和甲醇、1,2-丁二醇等副产品。论文的结果将为乙二醇的工业生产提供参考。

The purification process of crude ethylene glycol is studied by using process simulation software Aspen Plus with the help of the appropriate thermodynamic methods, separation model and appropriate separation sequence. The sensitivity analysis tool was used to simulate and optimize ethylene glycol separation process with removal methanol column, mid-hybrid column, removal ethanol column, removal 1, 2-butanediol columns and refining column respectively. For the component of 1, 2-butanediol which form azeotropic components with ethylene glycol, this paper compared the azeotropic distillation and extraction separation method, finally chose the extraction method because of high separation efficiency, low energy consumption. Operating conditions such as the number of theoretical stages, location of feed stage and reflux ratio of the each column were optimized. Furthermore, the whole purification process is simulated based on the optimal operating conditions and sequential extraction method, and separated highly purified ethylene glycol product and methanol, 1, 2-butanediol as a by-product. The results of this paper will provide an important reference for industrial production.