The Development Of An Energy Saving Catalyst Of Ethylbezene Dehydraugenation To Styrene

Styrene is one of the most important monomers in modern petrochemical industry. Traditional procedure of ethylbenzene dehydrogenation to styrene has many side effects, such as high energy consumption. Therefore, developing a high active, selective and stable catalyst which can be operated in low steam-to-oil ratio becomes a green target to be pursued.This thesis is focus on developing an energy saving catalyst of ethylbezene dehydraugenation to styrene. The catalyst components and making procedures have been detailly investigated. The XRD, Mossbauer spectroscopy, SEM and H2-TPR results show that it is good for KFe11O17 generation when Fe2O3/K2O mass ratio 7.5, Ce(C2O4)2 and Ce(NO3)2 mixture used as Ce precursor substance and calcinated at 800℃. It is also revealed that adding proper amount of TiO2 (TiO2:Fe2O3 mass ratio 0.1:75)can promote to form KFe11O17 spinel, reduce the CeO2 particle size, and enhance its dispensity, consequently increase the redox points on the surface of the catalyst. Optimizing the calcinate temperature and introducing pare-forming agent are effective ways to construct different level of porous structure and favor reactant and product diffusion. CaO and MgO used as structural promoter and CuO used as anti-reducing agent can reduce the coke deposition on the catalyst surface and stability of componnet valence and get high performance energy saving catalyst. Some measures such as larger Fe2O3 particles and smaller CeO2 particles pre-formating iron potassium compounds and using secondary roasting and rotary furnace and tunnel kiln combination roasting, which eliminate amplification effect of the catalyst in the industry process and lead to the catalyst perfoamance better than that prepared in Laboratory.Industry scale test was performed on 60,000t/a ethylbenzene dehydrogenation to styrene device. The operating S/O was lower 10% than previous catalyst. The conversion of ethylbenzene is greater than 62%, the selectivity is 97.5% and yield of styrene is 60.5%. This energy saving catalyst was operated for 12 monthes under low S/O stably and broke the related record of domestic catalyst.