KINETIC MODELING OF CATALYTIC CRACKING OF GAS OILS USING INSITU TRAPS(FCCT) TO PREVENT METAL CONTAMINANT EFFECTS

The unsteady-state pulse technique, gas oil pulses reacting with fluid catalytic cracking (FCC) catalyst, was used to study the effects of m etal traps in a FCC catalyst contaminated with high levels of nickel a nd vanadium: 3000 ppm Ni and 4500 ppm V. The catalyst, steamed to achi eve equilibrium conditions, was artificially impregnated with an antim ony compound (0-2100 ppm) and with nickel and vanadium naphthenates. E xperimental runs were performed in a microcatalytic fixed bed reactor using different carrier gas flows (120-150 mL(STP)/min) and different temperatures (510-550-degrees-C). A four-lump model was employed to de scribe experimental results and to obtain kinetic constants. Experimen tal data with FCCT showed that the selectivity to gasoline as well as the gasoline yield was significantly improved, coke formation was redu ced, and gas formation was increased.