Reactor and horizontal cyclone separator with primary mass flow and secondary centrifugal separation of solid and fluid phases

A reactor and separator apparatus for separating gaseous hydrocarbonaceous materials from solid fine catalytic particles which apparatus comprises:

• (a) a tubular elongated riser reactor having a cross section diameter through which hydrocarbon materials are passed upward and cracked in the presence of the solid fine catalytic particles and which communicates with a horizontal cyclone separator having a bottom with a center line and being discharge therein through the bottom of said horizontal cyclone separator at a situs not on said center line with respect to a vertical plane through the center of said cyclone separator, wherein cracked gaseous hydrocarbonaceous materials and solid fine catalytic particles enter said cyclone separator at a centrifugal velocity sufficient to disengage a majority of the fine solid catalyst particles from the gaseous hydrocarbonaceous materials by primary mass flow separation;
• (b) said horizontal cyclone separator having a relatively horizontal axis, an off center side inlet in said bottom of said horizontal cyclone separator, a gaseous hydrocarbon materials outlet in a first side wall of said horizontal cyclone separator, an imperforate top in said horizontal cyclone separator, an imperforate second side wall in said horizontal cyclone separator, and an inclined slot solid dropout means situated juxtaposed with respect to the interconnection of said tubular elongated riser with said horizontal cyclone separator and situated at a position to receive the disengaged fine solid catalyst particles by the centrifugal velocity, said horizontal cyclone separator being in interconnection with a vertical downcomer conduit at a locus substantially opposite to said interconnection of said horizontal cyclone separator with said tubular reactor with respect to the horizontal axis of said horizontal cyclone separator, said vertical downcomer conduit positioned to receive a minor portion of the fine solid catalytic particles disengaged via secondary centrifugal separation, wherein said horizontal cyclone separator and tubular reactor are constructed such that a vortex comprising a helical flow path of gaseous hydrocarbon materials extends from said second side wall to said gaseous hydrocarbon materials outlet in said first side wall, the helical flow having a swirl ratio greater than 0.2, said swirl ratio being defined by the tangential velocity of the hydrocarbonaceous materials across the cross section of said tubular elongated riser divided by the superficial axial velocity of the hydrocarbonaceous material across the cross section of said gaseous hydrocarbonaceous materials outlet, where maintaining said swirl velocity at greater than 0.2 is sufficient to form a vortex of hydrocarbonaceous materials in said horizontal cyclone separator wherein said inclined slot solid dropout means forms a continuous opening along the entire bottom of said horizontal cyclone separator and wherein said off center inlet, said gaseous hydrocarbon materials outlet and said imperforate second side wall are situated to provide that the gaseous hydrocarbon materials entering through said off center inlet pass into said horizontal cyclone separator to said imperforate second side wall and reverse flow in the opposite direction to traverse said horizontal cyclone and then exit said horizontal cyclone separator at the gaseous hydrocarbon materials outlet in the first side wall;
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• (c) a stripping zone having a stripping gas inlet means and containing a relatively dense bed of solid line catalytic particles having a highest level and being received from both (1) said primary mass flow separation via said inclined slot solid dropout means and (2) said secondary centrifugal separation via said vertical downcomer conduit, said stripping zone interconnecting a downstream catalytic particle regeneration zone and said vertical downcomer conduit, wherein stripping gas is passed to said stripping zone by means of said stripping gas inlet means and wherein the helical flow path of the hydrocarbonaceous materials extending from said second side wall to said gaseous hydrocarbon materials outlet in said first side wall prohibits at least a portion of the stripping gas from passing upward through said vertical downcomer conduit and into said horizontal cyclone separator.

A reactor and separator apparatus for the separation of solid catalytic particles and a fluid phase comprising reactants and products which apparatus comprises:

• (a) a horizontal elongated vessel having a diameter, a body comprising a top having a center line, a first imperforate side wall, a bottom and a perforate second side wall for penetration of a fluid phase outlet withdrawal conduit;
• (b) an elongated downflow tubular reactor having a cross section and interconnecting a portion of said top of said horizontal elongated vessel at a position adjacent said perforate second side wall off center from the center line of said top of said vessel defining an off-center ingress as defined by a vertical plane passing through the diameter of said horizontal body, for passage of an admixture of the solid catalytic particles and the fluid phase in a downward direction through said tubular reactor into said horizontal elongated vessel;
• (c) a downcomer elongated relatively vertical conduit interconnecting said horizontal elongated vessel bottom adjacent said first imperforate side wall of said horizontal elongated vessel opposite interconnection of said horizontal elongated vessel top with said elongated downflow tubular reactor for passage downward through said downcomer vertical conduit of a relatively small amount of the solid phase;
• (d) a fluid phase outlet withdrawal conduit having a diameter cross section and situated in said perforate second side wall of said vessel beneath and to the side of said interconnection of said elongated downflow tubular reactor with said top of said horizontal elongated vessel for the continuous removal of the fluid phase after a secondary centrifugal separation from the solid catalytic particles;
• (e) an inclined slot solid dropout means interconnecting said downcomer vertical conduit and said bottom of said vessel at a position at least 90.degree. separated from said downflow tubular reactor interconnection with said top of said vessel as measured by the angle around the circumference of said vessel where 360.degree. equal one complete revolution around said circumference, said dropout means designed to form a continuous opening along the entire bottom of said horizontal vessel and to receive solid catalyst particles by primary mass separation of solid catalyst particles from the fluid phase by centrifugal acceleration of the solid catalyst particles about said angle of at least 90.degree. in said horizontal vessel, wherein the solid particles are accelerated against said horizontal body to cause primary mass flow separation and to pass the majority of the solid catalyst particles through said inclined solid dropout means to said downcomer vertical conduit;
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• (f) wherein said withdrawal conduit, horizontal elongated vessel and said downflow tubular reactor are constructed to insure that the diameter of said withdrawl conduit is smaller than the diameter of said horizontal elongated vessel and said off center ingress of said admixture of said solid particles and fluid phase develop a swirl ratio of greater than 0.2 defined by the tangential velocity of the fluid across the cross section diameter of said tubular reactor divided by the superficial axial velocity of said fluid through the cross section of said withdrawal conduit sufficient to form a vortex of the fluid phase in a helical path of fluid which passes through said horizontal vessel to said first imperforate side wall and reverse the flow path of the fluid phase in the opposite direction to said withdrawal conduit and wherein the helical flow path extends from said imperforate side wall opposite said fluid withdrawal conduit to exit through said fluid withdrawal conduit to cause said secondary centrifugal separation and disengagement of entrained solid catalyst particles from the fluid phase and passage of the disengaged solid particles to the point of interconnection of said horizontal vessel with said downcomer vertical conduit and to thereby pass the disengaged and separated solid particles through said downcomer conduit.