The present invention discloses processes for oligomerizing an olefin feedstock containing C.sub.4 to C.sub.20 alpha olefins using a catalyst system containing a metallocene compound, an organoaluminum compound, and a suspension of a chemically-treated solid oxide. The liquid medium for the suspension of the chemically-treated solid oxide can be an alpha-olefin oligomer product formed by the oligomerization process.

The present invention discloses processes for oligomerizing an olefin feedstock containing C.sub.4 to C.sub.20 alpha olefins using a catalyst system containing a metallocene compound, an organoaluminum compound, and a suspension of a chemically-treated solid oxide. The liquid medium for the suspension of the chemically-treated solid oxide can be an alpha-olefin oligomer product formed by the oligomerization process.

A reactor comprises an outer sidewall and a bottom wall enclosing a hollow chamber comprising a lower fluidized bed zone and an upper freeboard zone. A plurality of inlets is provided for injecting at least one fluidizing medium into the fluidized bed zone and creating a swirling flow. At least one feed inlet communicates with the fluidized bed zone; and at least one product outlet is provided for removing a product from the chamber, the outlet(s) communicating with either the fluidized bed zone or the freeboard zone. The reactor has at least one internal barrier located inside the hollow chamber, and at least partly located in the fluidized bed zone. The internal barrier(s) have at least one opening within the fluidized bed zone, such as an underflow opening, to permit internal recirculation of material from the product zone to the feed zone, thereby simplifying reactor structure.

Systems and methods for producing light olefins via catalytic cracking of naphtha are disclosed. A naphtha feed stream and lift gas stream are fed into a dense phase riser reactor operated with a high solid volume fraction, a high superficial velocity, minimum back mixing. The effluent stream from the dense phase riser reactor is further separated, in a secondary reactor, to form a gaseous product stream and a catalyst stream. The catalyst stream is stripped to remove the hydrocarbons adsorbed on the catalyst particles. The stripped catalyst is regenerated in a regenerator.

Methods for determining ethylene concentration in an ethylene oligomerization reactor using an ultrasonic flow meter are described, and these methods are integrated into ethylene oligomerization processes and related oligomerization reactor systems.

A powder processing apparatus includes a vessel. The vessel has an interior chamber that includes top and bottom regions, and a gas outlet to the exterior of the vessel. A wall divides the bottom region into first and second sub-regions, with the top region extending above the wall. First and second porous plates divide the first and second sub-regions such that there are first and second manifold regions below the first and second porous plates. The first and second gas manifold regions include first and second gas inlets from the exterior of the vessel.

An apparatus used in a fluidized reaction process comprising a vessel; a riser housed within the vessel; and a plurality of angled guide supports, wherein each guide support comprises an tubular section having a first end and a second end; a first hinge wherein a first end of the first hinge is connected to the first end of the tubular section, a second hinge wherein a first end of the second hinge is connected to the second end of the tubular section, wherein a second end of the first hinge is connected to an inside surface of the vessel and a second end of the second hinge is connected to the riser guide is provided.

One or more embodiments relate to a contactor/separator vessel for reacting with fine particles. The contractor/separator vessel includes a spouted bed containing fine Geldart class C particles; and an additional spoutable media to facilitate spouting of the fine Geldart class C particles in order to improve mixing, gas-solid contact/separation.

The present invention discloses processes for oligomerizing an olefin feedstock containing C.sub.4 to C.sub.20 alpha olefins using a catalyst system containing a metallocene compound, an organoaluminum compound, and a suspension of a chemically-treated solid oxide. The liquid medium for the suspension of the chemically-treated solid oxide can be an alpha-olefin oligomer product formed by the oligomerization process.

A reactor comprises a reactor vessel defining a confined reactor volume, a support assembly extending about a periphery of the confined reactor volume, a basket positioned within the reactor vessel and supported by the support assembly, the basket having an interior surface and an exterior surface, a downflow zone being defined between the exterior surface of the basket and an interior surface of the confined reactor volume, an inlet screen positioned adjacent to one end of the interior surface and an outlet screen positioned adjacent to an opposite end of the interior surface, an upflow zone defined between the inlet screen and outlet screen, the inlet screen and the outlet screen containing a quantity of particulate catalyst, and a circulating device positioned above said upflow zone and configured to continuously circulate fluid upwardly though said upflow zone and downwardly through said downflow zone, the support assembly and the basket configured to promote the formation of a fluid vortex within a portion of the downflow zone.