Process and apparatus for contacting a hydrocarbon feedstock with hot solid particles in a tubular reactor with a rising fluidized bed
AssigneeCompagnie de Raffinage et de Distribution Total France
InventorsPierre Maroy, Roben Loutaty, Thierry Patureaux
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Abstract
In a fluidized catalytic cracking (FLC) type unit for contacting of a hydrocarbon feedstock with hot solid particles in a fluidized bed in an upright tubular-type upflow hydrocarbon conversion reactor, there is provided, between the means for fluidization and the means for injection of the feedstock, a means for causing the fluidized phase at the periphery of the reactor to rotate about the axis of the reactor.
Claims15
A process for contacting a hydrocarbon feedstock with hot solid particles in a centrally-open substantially vertical tubular reactor operated with a rising dilute fluidized bed having an injection zone for the hydrocarbon feedstock, said process comprising introducing the particles into the tubular reactor in an uprising, vertical flow direction, fluidizing the particles so as to provide a vertically rising, axially moving fluidized bed, injecting feedstock into the injection zone and, at a point in the tubular reactor downstream from the introducing and fluidizing steps, imparting at the outer periphery of said bed a rotational motion about the axis of the reactor effective to counteract backmixing and reduce the residence time of particles at least at the periphery of said bed and also reduce particle density at the periphery of said bed for more uniform particle distribution so that at the injection zone the speed of rotation of the fluidized bed at the periphery of the reactor, in a plane normal to this axis, is from approximately 0.5 to approximately 1.5 times the velocity of the fluids flowing vertically along the axis of the reactor.
A process for contacting a hydrocarbon feedstock with hot solid particles in a centrally-open substantially vertical tubular reactor which is operated with a vertically rising, axially moving dilute fluidized bed, said process comprising
- a. providing a centrally-open substantially vertical reactor for contacting a hydrocarbon feedstock with hot solid particles and which is operated with a vertically rising, axially moving fluidized bed,
- b. introducing hot solid particles into said reactor in an uprising, vertical flow direction,
- c. fluidizing said particles in a fluidization zone so as to provide said vertically rising, axially moving fluidized bed;
- d. injecting a hydrocarbon feedstock into said reactor in a zone of injection located above the point of injection of the hot solid particles and
- e. imparting the fluidized bed in a portion of the reactor located above the fluidization zone and below the zone of injection of the hydrocarbon feedstock a rotational motion about the central axis of the reactor so as to produce an equalization of moduli of fluids directly below the zone of injection and so that at the level of introduction of the feedstock rotational speed has been imparted to the fluidized bed at the periphery of the reactor.
Dependencies are inferred from the claim text.