聚甲氧基二甲醚合成工艺及产业化述评

聚甲氧基二甲醚（DMM_n）作为一种新型绿色环保柴油添加剂，因其具有较高的十六烷值和含氧量，能有效减轻燃烧后的污染物排放，同时完善以煤基甲醇为源头的煤化工产业结构，这使得其合成工艺及产业化进程受到国内外学者的广泛关注。本文对国内外DMM_n合成工艺、国内工业化布局以及未来发展前景进行综述。在现有工艺基础上，归纳总结了由甲醇出发经不同中间产物合成DMM_n的各类合成路线的特点。通过分析制约DMM_n工业化进程的关键因素，特别是结合当前全球性新冠肺炎疫情导致的石油价格断崖式下跌，给煤化工产业带来巨大的冲击，认为反应精馏工艺将成为未来DMM_n产品推广和工业应用最具有竞争潜力的工艺技术路线。

Review on the synthesis process and industrialization of polyoxymethylene dimethyl ethers

Polyoxymethylene dimethyl ethers (DMM_n), as a new type of green and environmentally friendly diesel fuel additive, can effectively reduce the emission of pollutants after combustion and improve the industrial structure of coal chemical industry with coal-based methanol as the source because of its high cetane number and oxygen content. Therefore, the synthesis process and industrialization process of DMM_n are widely concerned by scholars at home and abroad. The domestic and foreign DMM_n synthesis process, industrial layout and future development prospects are reviewed. Based on the existing process, the characteristics of various synthesis routes of methanol to DMM_n through different intermediate products are summarized. Through the analysis of the key factors restricting the DMM_n industrialization process, especially the sharp drop in oil price caused by the global COVID-19, which has brought a huge impact on the coal chemical industry, reactive distillation is considered as the most competitive technology route for DMM_n product promotion and industrial application in the future.