Abstract: A method of fluid catalytic cracking of hydrocarbon feed which for rapid separation of the fluid catalytic cracking catalyst from the mixture of gases and products, utilizes a U-turn inertial separator directly coupled to cyclone separation.

Abstract: The present invention is an ammonia injection scheme for enhanced NO.sub.x reductions wherein the NO.sub.x containing gas to be treated is upstream of a cyclone separator. The enhanced NO.sub.x reductions is accomplished by injecting the ammonia through the inside wall of the cyclone inlet duct.

Abstract: Apparatus for separating particulate solids from a process gas stream which includes one or more primary separation chambers, preferably ballistic separation chambers, for removing a major portion of the solids entrained in the gas stream. One or more secondary separator chambers containing multi-cyclones are employed for removing substantially all of the remaining solids from the gas discharged from the primary separator chamber. The ballistic separation chamber has an inlet portion and a larger diameter outlet portion, and it may have an arcuate shape to aid in the separation.

Abstract: Accordingly, the present invention, in one embodiment, encompasses an apparatus for the fluidized catalytic cracking of a hydrocarbon feed comprising: a riser which is generally vertically positioned within a catalyst disengaging zone and which has a plurality of openings around the circumference of the riser at its discharge end. The openings in the riser have a vertical stub portion that extends tangentially outwardly from the riser and communicates with a first end of an upwardly sloping curvilinear tunnel that terminates at a second end. The second end of the tunnel opens into a tangential opening in the primary cyclone. The area of the opening of the first end of the tunnel is larger than the area of the opening of the second end of the tunnel.

Abstract: A centralized system for removing the plume resulting from laser surgery, electrocauterization or orthopaedic surgery that takes advantage of the articulating arms frequently found in medical procedure rooms. The plume is drawn away from the surgery location by a vacuum. The tubing that carries the plume is held near the location of the medical procedure, and the plume is then drawn into the tubing. The tubing leads through the articulating arm to a main located above the ceiling. The main leads to a central room that includes, in series, a centrifugal separator, a vacuum producer and a high efficiency air filter.