Design of Epichlorohydrin-Oriented Quaternary System Separation via Hybrid Extraction–Distillation Process
Design of Epichlorohydrin-Oriented Quaternary System Separation via Hybrid Extraction–Distillation Process
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DOI：
10.1021/acs.iecr.8b06039
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发表时间：
2019-03
影响因子：
4.2
通讯作者：
Liu Yang;Xiangyang Li;Chao Yang;S. Yuan
中科院分区：
文献类型：
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作者：
Liu Yang;Xiangyang Li;Chao Yang;S. Yuan
烯丙基氯（ALC）环氧化法制备环氧氯丙烷（ECH）具有原子效率高、环境友好等突出优点。然而，从ECH/H_2O/ALC/甲醇（MET）四元体系中分离ECH仍然是一个巨大的挑战。针对单独萃取或精馏过程能耗高、效率低的缺点，探索了萃取-精馏复合过程。首先，推荐ALC作为溶剂。在此基础上，采用白杨Plus软件，以年总成本（TAC）最小为原则，对萃取-精馏组合工艺流程进行了优化设计。最后，对精馏塔的几种不同设置进行了探索，得到了最佳组合，ECH纯度为0.998，TAC最大节省37.26%，表明萃取精馏复合工艺是可行的，有利于丙烯酰胺的工业化生产。
The allyl chloride (ALC) epoxidation method for preparing epichlorohydrin (ECH) has outstanding advantages such as atom efficiency and environmental friendliness. However, the separation of ECH from the ECH/H2O/ALC/methanol (MET) quaternary system is still a great challenge for industrial interest. A hybrid extraction–distillation process is explored in this work to overcome the defects of high energy consumption and low efficiency in the process with separate extraction or distillation. At first, ALC is recommended as the solvent. Then the flow sheet of a hybrid extraction–distillation process was designed and subsequently optimized using Aspen Plus according to the total annual cost (TAC) minimum principle. Last, several different settings of the distillation column were explored and an optimal combination with an ECH purity of 0.998 and a maximum savings of 37.26% TAC was found. The results show that the hybrid extraction–distillation process is feasible and beneficial to industrialization of the propo...