FIELD: catalytic cracking of hydrocarbon raw materials; applicable with fluidized bed. SUBSTANCE: cyclone separator with ascending flow is located beyond reactor chamber. Separated catalyst from cyclone separator with ascending flow enters desorber, and separated vapor is directed to gas collector. Desorber and gas collector are located inside of reactor chamber. Device also has means with withdrawal of desorbed gas from catalyst desorber and its supply through cyclone separator with ascending flow to gas collector. Maintained in cyclone separator with ascending flow is constant pressure relative to reactor chamber. Invention makes it possible to quickly separate catalyst-hydrocarbon suspension. EFFECT: higher efficiency. 7 cl, 2 dwg
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