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Oktifine 480P catalyst, containing catalytic additives, is used on refineries in Ufa to boost light olefin production and increase gasoline octanes in the Fluid Catalytic Cracking (FCC) process. Under the hydrothermal conditions present in the FCC regenerator (typically > 700 oC and > 8 % steam), FCC catalysts partly deactivates. Zeolite undergoes to dealumination and partial structural collapse, thereby losing activity, micropore surface area, and has changes in selectivity. Fresh catalyst are added at appropriate respective levels to the FCC unit to keep overall targeted steady state activity and selectivity. To pin down change rate of the structure and catalytic properties of the catalyst after heat treatment a number of studies were done. For research, microspheric catalyst Oktifine 480P, produced on Ishimbay Specialized Chemical Plant of Catalysts, was exposed to thermal treatment under 700 oС, 760 oС, 800 oС temperatures. ASTM D3907 standard feed was used for micro-activity cracking testing at 480 oС. Fresh catalyst Oktifine 480P was very active at vacuum gasoil cracking, micro-activity was estimated to 90,3 %. The micro-activity of heat treated samples were slowly decreasing by temperature increasing but still very high to compare with micro-activity of equilibrated sample of catalyst. So micro-activities for thermal treated samples under 700 oС, 760 oС, 800 oС were respectively 87,5 %, 85,2 %, 84 %, 85 % and micro-activity of equilibrated sample of catalyst was 42,4 %. |
