Study On Effect Of Catalyst And Processing Parameters On The Yield Of Maleic Anhydride For Industrial Production

This article summarized the characteristics of various preparationtechnological process of maleic anhydride at home and abroad, andintroduced the technical progress of maleic anhydride catalysts. It wasemphatically discussed that the effects of catalyst performance and avariety of technological conditions on the yield of maleic anhydride inthe process of the gaseous benzene oxidation to maleic anhydride on thefixed bed.The selection of the active component of catalyst and carrier, theimprovement of preparation technology and the application of activationconditions had been expounded for the benzene oxidation to maleicanhydride on the fixed bed. It was mainly reflected the activity andselectivity of catalyst could be effectively adjusted by choosingappropriate cocatalyst and rare earth elements and maintaining a certainformula proportion, which would improve the yield of maleic anhydridein the V-Mo-based catalyst system. Moreover the operating data in thesmall-scall test installation and industrial production unit could provedouble stage bed catalyst was feasible in industrial applications. Theoxidation yield was4%higher than that of imported catalyst and theconsumption of raw material benzene was reduced more than30kg/tons.Good results generated from the outside activation process on thecatalyst performance were further added by the characterization of X-raydiffraction(XRD) and X-ray Photoelectron Spectroscopy(XPS) ofcatalysts.Due to incorrect operation, maleic anhydride yield is alwaysdecreasing. This paper determined the better process control conditionsafter combining the basis of summarizing the predecessors’ work with theactual production and analyzing the factors affecting the yield of maleicanhydride in the oxidation and the azeotropic dehydration process. Theyield of maleic anhydride could also further increased by raising thecooling efficiency of partial condenser and ensuring the normal operationof equipment. Comparing intermittent and continuous operation modes inthe refinding process, it could be found the continuous refining processwas better, which could make the yield of maleic anhydride raise to2%on the original foundation.