| 摘要 |
Apparatus comprising a fluidized-bed catalytic cracking plant riser reactor having an axial passageway extending between said inlet end for receiving hydrocarbonaceous feed and catalyst particles and wherein said outlet end discharges effluent and catalyst particles, which reactor riser is provided with a plurality of contacting devices arranged axially spaced apart in said axial passageway, wherein each said contacting device comprises a mixing element having the shape of a segment of arc, wherein the mixing element of each said contacting device is present in a plane perpendicular to the central longitudinal axis of the passageway and wherein the mixing element of a contacting device is arranged staggered with respect to the mixing element of an adjacent contacting device.
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