FIELD: petroleum processing and petrochemistry.
SUBSTANCE: part of regenerated catalyst is recycled by means of flowing carrier introduced to lower end of tubular zone, while the rest of catalyst and column charge circulate within annular zone disposed between tubular zone and riser pipe wall. Temperature and/or weight ratio of catalyst to charge in inner pipe are more severe than those in annular zone. Once charge is injected, first stream leaving tubular zone and second stream leaving annular zone are mixed with each other. Resulting mixture containing catalyst is cooled by spraying inert fluid, which is evaporated at the charge injection level or higher level.
EFFECT: increased degree of conversion.
18 cl, 2 dwg, 1 tbl, 4 ex
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