隔板塔应用于氯乙烯精馏过程的模拟分析

Simulation and analysis of application of DWC column in VC distillation process

提出了基于隔板塔的氯乙烯精馏流程,采用Aspen软件对传统氯乙烯精馏的双塔流程和基于隔板塔的新流程进行稳态模拟,计算结果的比较和分析表明,在相同进料和基本一致的操作条件下,隔板塔流程能够达到传统双塔的精馏效果,精氯乙烯组成能够满足后续聚合要求,而且隔板塔流程在简化工艺、降低设备成本、节能降耗方面,相比较传统流程具有一定优势。采用隔板塔可以降低塔内温度和减少单体在塔内停留时间,在一定程度上能够缓解氯乙烯单体自聚结焦。

New process for vinyl chloride distillation based on dividing wall column （DWC） is developed in this study. Steady simulation using Aspen software is carried out to compare with the traditional two tower process. The results show that,with the same feed and almost identical operating conditions, DWC process can achieve the same distillation effects as the traditional two tower process, and has more advantages such as lower device cost and less energy consumption. In addition, DWC process can reduce residence time of VC inside the column, which is helpful to solve the problem of VC self-polymerization and agglomeration.