聚甲氧基二甲醚合成反应动力学研究进展

聚甲氧基二甲醚（PODE_n）作为一种潜在的柴油调和组分，能够有效减少柴油燃烧不充分所带来的污染排放。但是，由于反应器放大设计和操作存在技术瓶颈，现阶段国内外尚无达到规模化生产的运行装置。本文以反应器的模型化设计为最终目标，介绍了不同PODE_n合成工艺的反应动力学研究现状，总结了合成工艺中亟待解决的问题。分析表明，水对反应速率存在影响并且改变PODE_n的产品分布，而以甲缩醛为端基源的反应在无水参与下副产物少，不仅降低产品的分离难度，还可极大简化动力学模型。同时，简述了合成反应链增长机制的研究进展，指出在未来研究中探明PODE_n合成反应机理对普适动力学模型的建立至关重要，从而应用于工艺优化和反应器放大设计。

Advances of formation kinetics of polymethoxy dimethyl ether

Polymethoxy dimethyl ether (PODE_n), as a potential blend component of diesel, can effectively reduce emission of the pollutants from insufficient combustion of diesel. However, the technological bottleneck in scaling up and operation of the reactor has hindered commercial production of PODE_n. Aiming at modelling design and operation of the PODE_n reactors, this article reviews advances in reaction kinetics of PODE_n synthesis in recent years for a variety of synthetic processes and summarizes the urgent issues in the synthesis of PODE_n.The analysis shows that water has an effect on the reaction rate and changes the products distribution of PODE_n.The reaction with methylal as the end group source has less by-products due to the absence of water, which can reduce the difficulty of products separation and greatly simplify the kinetic model. Simultaneously,the research progress of chain growth mechanism is briefly described. It is proposed that insights into the reaction mechanism of PODE_n synthesis are critical to construct a universal kinetic model in the future, so that it can be applied to process optimization and reactor scale-up design.