糠醛催化氧化制顺酐及宏观动力学的研究

Catalytic oxidation of furfural to maleic anhydride and its reaction of kinetics

采用浸渍法制备负载型钼钨磷(MoWP)催化剂,空气为氧化剂,将可再生资源糠醛催化氧化制备顺丁烯二酸酐。以固定床微反应器评价催化剂的性能,研究了催化剂焙烧温度、接触时间、反应温度及糠醛摩尔比对反应的影响,并对糠醛气相氧化制顺酐的反应动力学特性进行了实验研究。结果表明,在催化剂焙烧温度为500℃、空速1 900 h-1、接触时间1.8 s、反应温度370℃、氧气与糠醛蒸气摩尔比为20∶1时,顺丁烯二酸酐收率最高达61.3%。按三角形反应网络建立的动力学模型与得出的动力学方程及参数同实验数据基本吻合。

An efficient catalytic oxidative reaction of renewable furfural by air was achieved in the presence of MoWP catalyst supported on silica, which was synthesized by dipping method. The effects of calcination temperature, contact time, reaction temperature and the mole ratio of oxygen to furfural on the oxidative reaction were investigated, which was studied through a fixed bed micro-reactor. The reaction kinetics of furfural gas-solid oxidation to maleic anhydride was experimentally studied under a wide range of operation conditions. The results indicate that the yield of maleic acid reaches as high as 61.3% under the condition of the calcination temperature of catalyst 500 ~C, space velocity 1 900 h - t, the contact time 1.8 s, reaction temperature 370 ~C, the mole ratio of oxygen to furfural 20 ： 1. A triangular reaction network was adopted to describe this complex reaction system, and the dynamic model was established with model parameters being estimated, which agreed with the exoerimental data.