VERFAHREN ZUM KATALYTISCHEN CRACKEN

摘要

A fluidized bed cracking process of a hydrocarbon charge is carried out in a tubular and vertical reaction zone (1), the catalyst being introduced at the lower end of this extended zone through pipe (2), and the charge being introduced through at least one pipe (3) opening into the reaction zone at a level higher than the level at which the catalyst is admitted. The process comprises, on one hand, sending back, through pipe (5), at least part of the reaction effluent heavy oil to a level higher than the level at which the charge is admitted and, on the other hand, sending back, through pipe (3-a), at least part of the gasline or of the LPGs from the reaction effluent to an intermediary level between the catalyst and the charge inlet points, the cracking reaction being carried out in the presence of a zeolite-based catalyst of the erionite family. <IMAGE>