Loading patent…
AssigneeNone recorded
InventorsWilson Kenzo Huziwara, Waldir Pedro Martignoni, Mauro Silva, Jose Geraldo Furtado Ramos, Aurelio Medina Dubois, Paulo Sergio Freire
Estimating the term…
A device and a method for operating it for application in a vertical tube reactor with downward flow (downer), has the aim of ensuring the intimate mixing of the solid particulate catalyst with a reagent fluid. Homogeneous distribution of catalyst is due to the use of a plate having perforations. Said perforated plate normally allows the passage of a portion of the stream of catalyst. The other portion overflows the edge of the plate, flowing in the form of an annular curtain, near the inner surface of the surrounding tube of the device. After passing beyond the perforated plate, the curtain-flow undergoes a deflection produced by an annular screen, to be mixed with the stream originating from the orifices in the perforated plate. A hydrocarbon charge is injected below the perforated plate, forming a certain angle with respect to the direction of the downward flow of catalyst, by means of inlets distributed uniformly about cross sections of the surrounding tube. After the mixing region, the diameter of the device, when smaller than the diameter of the associated tube reactor, expands slightly.
Multifunctional entry method for a downward flow tube reactor for supplying and distributing catalyst and mixing it with a hydrocarbon charge, for application in a multifunctional entry device for a downward flow tube reactor, characterised in that catalyst is distributed by means of the use of a plate having perforations, part of the catalyst being distributed by overflowing the plate as an annular curtain, comprising the following stages:
Multifunctional entry device for a downward flow tube reactor for supplying and distributing catalyst and mixing it with a hydrocarbon charge, for application to the upper portion of said reactor, characterised in that it comprises:
Dependencies are inferred from the claim text.
No related US applications are recorded in the indexed filing history.
Backward citations are indexed for grants only.
Drawings are temporarily unavailable. Open the PDF at USPTO
With nozzles: for spraying a fluid on falling particles or on a liquid curtain
Feeding of the particles in the reactor; Evacuation of the particles out of the reactor: in a downward flow
In tube reactors; the solid particles being arranged in tubes: feeding reactive fluids
Feeding of the fluidising gas: the fluidising gas being a reactant
Term end not estimated
The present invention relates to the area of petroleum refining.
More specifically, the field of application of the invention is reactors used in fluid catalytic cracking (FCC) processes or other processes which make use of solid particulate catalyst.
More particularly still, the invention relates to a device and to a method for supplying and homogeneously distributing solid particulate catalyst and for intimately mixing it with a reagent fluid, for application in a tube reactor with downward flow (downer).
FIG. 1 shows a diagrammatic longitudinal section through a preferred embodiment of the invention.
FIG. 2 shows a diagrammatic longitudinal section through a further preferred embodiment of the invention, in which it is possible to see a fluidisation ring inside the distributor vessel.
FIG. 3 shows a diagrammatic longitudinal section through an embodiment of the invention, as constructed for preliminary tests.
To enhance comprehension the invention will be described with reference to the accompanying drawings. However, the Figures diagrammatically illustrate merely variants of preferred embodiments of the invention and therefore are non-limiting in nature. The inventive concept to be described below having been obeyed, it will be obvious to those skilled in the art that it is possible to use other arrangements, complementary devices or modifications to the component design, within the scope of the invention as claimed herein.
The invention presents an entry device for use in downer-type vertical reactors for catalyst/hydrocarbon-charge ratios preferably in the range from 6 to 8, but the ratio may be below or above this range. A typical application would be, for example, in a unit processing from 5000 to 10000 m3/day of gas oil or atmospheric residue (bottom product of the petroleum or crude-oil atmospheric distillation tower).
Two preferred embodiments of the invention and the design of one prototype are shown in FIGS. 1 to 5.