Abstract: A novel moving bed process for methanol to propylene (MMTP), and conducts engineering analysis for this process were presented. Firstly, according to the principle that the reactor must be matched with reaction catalyst deactivation, the most matching reactor for ZSM-5 catalysts (with mid-level deactivation) is moving bed. Moreover, the MMTP process can not only exert higher propylene selectivity of the catalyst, but also can utilize medium particle circulation rate for reaction and regeneration to serialize and stabilize high yield of propylene process. Secondly, regarding the strong exothermal characteristics of the MMTP reaction, two kinds of processes, fluidized bed one-step operation and fixed bed two-step operation, are compared. Based on the comparison results, it is concluded that the two-step operation of MMTP process can allocate reasonable reaction heat and control product distribution with flexibility. Finally, through integration of heat-exchange network optimization and alcohol-oil refining process, MMTP process owns high propylene yield on the basis of water and energy saving. On the basis of current MMTP process, 10000 t·a^-1 propylene technology package design has been completed. In summary, MMTP owns visible competitive advantages both on technique and economics, which has high application potential in industry.

Key words: methanol to propylene, moving bed, alcohol and oil refining, two-step route, deactivation, optimization

摘要： 提出了一种新型的移动床甲醇制丙烯工艺（MMTP）并进行工程化分析。首先，根据反应器必须与催化剂的反应失活速率相匹配的原则，认为移动床是与失活速率处于中等水平的ZSM-5催化剂相匹配的最佳反应器。因此，MMTP工艺在充分发挥ZSM-5催化剂多产丙烯优势的基础上，结合移动床的中等循环速率进行反应-再生，从而实现催化剂高产丙烯的连续化与稳定化；其次，针对MTP反应的强放热特点，对比了流化床工艺的一步法操作与固定床工艺的两步法操作，发现MMTP工艺采用两步法操作既能合理地分配反应热，又能灵活地调控产品分布；最后，通过换热网络的优化设计与醇油共炼的工艺集成，使得MMTP工艺在节水节能的同时仍具有高丙烯收率。目前，在现有的MMTP工艺技术基础上，已经完成1万吨丙烯/年的工艺包设计，技术和经济的竞争优势十分明显，市场推广应用前景广阔。

关键词: 甲醇制丙烯, 移动床, 醇油共炼, 两步法, 失活, 优化