含醇醚有机废水萃取精馏净化工艺的优化设计

Optimization design of extractive distillation purification process for organic wastewater containing isopropanol and isopropyl ether

采用萃取精馏法,以乙二醇为萃取剂,选择UNIQUAC物性方法,基于Aspen Plus对含异丙醚和异丙醇的高浓度有机废水的四塔分离回收工艺进行了概念设计和模拟研究。通过分析萃取剂用量对异丙醇/异丙醚/水体系相对挥发度的影响,确定了最佳溶剂比,以再沸器热负荷最小为目标值,确定了各塔最优的理论板数和进料位置。最后,对全流程进行了模拟和经济评价,结果表明,有机废水不仅实现了达标排放,而且具有很大的经济潜力。

The separation and recovery process of high concentration organic wastewater containing isopropyl ether and isopropyl alcohol is studied by extraction distillation,using ethylene glycol as extractant and UNIQUAC as the extraction method. The conceptual design and simulation study are carried out. The optimum solvent ratio is determined by analyzing the effect of the amount of extractant on the relative volatility of the isopropanol / isopropyl ether / water system. The optimal number of theoretical plates and the feeding position are determined by minimizing the heat load of the reboiler. Finally,the whole process is simulated and evaluated. The results show that the treated organic wastewater not only achieves the discharge standard,but also has great economic potential.