Hydrocracking Lumped Kinetic Model with Catalyst Deactivation in Arak Refinery Hydrocracker Unit

A kinetic model of a fixed bed tubular reactor incorporating catalyst deactivation was developed for the isomax unit of arak refinery. the kinetic parameters for the hydrocracking reactions over the commercial catalyst were determined using intial activity plant data i.e.when the catalyst is fresh . catalyst deactivation was then taken into account by means of deactivation function based on plant data. the catalyst deactivation function is defined in the term of normalized time bpp of operation. effect of catalyst deactivation on the product yield has been investigated. steady state material and energy balances were then developed for an extended four-lumped kinetic network . to determine the effect of reaction types on the rate, we calculate frequency factor for each individual bed with constant activation energy and heat of reaction. farther more , we calculate the frequency factor for individual beds for the first one to estimate the rate of reactions in the different beds