Abstract
AbstractGasoline selectivity in the catalytic cracking of four neutral distillates, varying only in wax content, has been studied over a range of temperatures. It has been found that the cracking rate constants leading to gasoline and to undesirable products, as well as the gasoline recracking rate constant, increase linearly with the mole fraction of wax in the feed. At the same time the activation energies for the primary rate constants decrease with increasing wax content of the feed, while the activation energy for gasoline recracking is not affected by feed composition.We also find that the various components of the feed crack quite independently of one another and do not interact in any way. There appears to be no synergistic interactions between the wax‐free fraction and the wax in the feed.In spite of the large difference between reaction rate constants reported here and those previously reported for the cracking of a mid‐continent gas oil by Pachovsky and Wojciechowski16, the Optimum Performance Envelopes for all the chargestocks we have studied are very similar. Our results indicate that the major differences between gas oils we have studied lie in their “reactivity”; in other words, in their relative rates of conversion at a given set of conditions.
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