Controlled catalyst deactivation in the laboratory is an essential component in the sequence of tests required for the prediaion of catalyst performance in a commercial FCC unit. Conventional single and multiple point deactivation followed by MAT testing gives useful predictions of nlative catalyst activitk and trends in major yields. These predictions can be cnhancedhymathunatical~baseduponaponlmitrlsta,butcxtcnsionsinto predicting the yields of individual components within the gasoline and LPG eactions ale unreliable.Ananalvsisofthenatureoftheworkingequilibriumcasalystshowsthatitisa complex mixture of age, activity, and metals di&butions which wo& together to generate the final product spcctmm. To get closer to predkt& this spccmuq it is necessary to simulate an equilibrium catalyst by blending fresh catalyst and a series of mildly and progressively more severely deactivated catalyst samples. The appmpk@ composition of the blend can be calculated and is a function of the initial catalyst activity, the catalyst decay rates in the laboratory and PCC unit, and the targecd unit catalyst activity and make-up rate. Another major factor in laboratory scale testing lies in the natme of the catalytic testing equipment. Analysis of an FCC riser cracker in terms of catalyst, fedstock, and product . .
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