In this paper, the conventional reactive distillation (CRD) of toluene diisocyanate (TDI) production process is designed and optimized by minimizing the total annual cost (TAC). In order to make the HCl content in the side stream of the reactive distillation correspond with the specifications of the CRD process, a lot of energy needs to be consumed. Therefore, a reactive distillation dividing-wall column (RD-DWC) is comparatively proposed. The results illustrate that compared with CRD process, the TAC and energy consumption of RD-DWC process decreases by 40.625% and 46.038%, respectively. Apart from that, the RD-DWC will also improve the safety of the TDI production process. During the design process, the control of CCA conversion rate of reactive column is a key factor for achieving this process efficient. Furthermore, a feasible control scheme is investigated. Specifically, the residence time is controlled by liquid level for the reactive distillation that could obviously reduce the generation of by-products. This control scheme can effectively control the process and achieve good dynamic performance when ±10% flow rate and feed composition disturbances are introduced. Research on control performance is significant to develop energy saving technology for RD-DWC process.

在本文中，通过最小化每年的总成本（TAC）设计和优化了甲苯二异氰酸酯（TDI）生产工艺的常规反应蒸馏（CRD）。为了使反应蒸馏的侧流中的HCl含量符合CRD方法的规格，需要消耗大量能量。因此，比较提出了反应蒸馏分隔壁塔（RD-DWC）。结果表明，与CRD工艺相比，RD-DWC工艺的TAC和能耗分别降低了40.625％和46.038％。除此之外，RD-DWC还可以提高TDI生产过程的安全性。在设计过程中，反应塔CCA转化率的控制是实现该过程高效的关键因素。此外，研究了可行的控制方案。具体而言，反应时间的停留时间受液位控制，这可以明显减少副产物的产生。当引入±10％的流量和饲料成分干扰时，该控制方案可以有效地控制过程并获得良好的动态性能。控制性能的研究对于开发RD-DWC工艺的节能技术具有重要意义。