Abstract
Publisher Summary Because of the complexity of resids and the difficulty of executing experiments with tight material balances, fundamental understanding of resid catalytic cracking (RCC) has lagged far behind that of vacuum gas oil (VGO) cracking. Most of the relatively few published studies have been aimed at evaluating the effects of incremental resid addition on VGO cracking. Data of fundamental nature are scarce. This chapter highlights some controlled experiments that were carried out with extreme feeds over extreme catalysts. The purpose is to shed some additional light on the evolution of coke buildup in RCC. From a kinetic standpoint, it is proposed to classify cokes based on the time scales on which they are formed. Four catalysts were used in these experiments. Catalyst A was an amorphous SiO2/Al2O3, which for stipulated purposes was considered as a matrix. Catalyst B was a USY zeolite. Catalysts C and D were commercial zeolite-containing catalysts. The extent of thermal cracking was studied with α-Al2O3.
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