Abstract: A method and device for treating a gas stream comprising at least one non-halogenated carbonaceous compound and optionally at least one halogenated organic compound. The gas stream, at 100.degree. C. to 650.degree. C. and in the presence of oxygen is contacted with a first catalyst in a first catalyst zone. The first catalyst comprises a first catalytic material deposited on a low acidity support material. In this zone, the non-halogenated compound is selectively reacted to form innocuous materials such as water and carbon monoxide. This can be followed by contacting the gas stream with a second catalyst in a second catalyst zone. The second catalyst comprises a second catalytic material deposited on a high acidity support material. In this zone, the halogenated organic compounds are reacted.

Abstract: An ultrasonic nozzle includes an atomizing surface for producing an atomized liquid spray; a liquid-feed passageway for supplying the process liquid to the atomizing surface, the passageway having a first diameter section and a second fluidly connected smaller diameter section, with a shoulder defined therebetween; an internal shut-off assembly for preventing the supply of process liquid to the atomizing surface, the shut-off assembly including a shut-off rod slidably positioned within the passageway and having a sealing end adapted to cooperate with the shoulder to prevent the supply of process liquid to the atomizing surface, an actuator piston connected with the opposite end of the shut-off rod and slidable within a cylinder bore that is in fluid communication with the passageway, and a valve actuator for slidably moving the piston and shut-off rod in the passageway between a first closed position in which the supply of liquid to the atomizing surface is prevented and a second open position in which the su

Abstract: A multiple, parallel packed column vaporizer for vaporizing a chemical having a relatively low decomposition temperature includes a shell; a plurality of parallel, vertically oriented vaporization columns arranged in the shell, each vaporization column having inner walls and upper and lower open ends; a distribution assembly for distributing the chemical substantially equally to the open upper ends of the vaporization columns, which flows downwardly therein; a heat exchanger which heats the vaporization columns to provide the heat needed to vaporize the chemical therein; and a gas supply which supplies the gas to the lower ends of the vaporization columns so that the chemical is vaporized and becomes entrained in the gas and is carried upwardly out of the vaporizer.

Abstract: Aqueous alkaline developable, UV curable urethane acrylate compounds and compositions are particularly useful for making flexible, 100% solids, solvent-free solder mask coatings which are characterized by having screen-printable viscosities, rapid developability and advantageous performance characteristics.

Abstract: A submersible positive displacement piston pump includes a cylinder for insertion within a body of liquid, the cylinder including a working end and an opposite end, an inlet port, an outlet port and a working chamber bounded by the outlet port and the working end; a piston rotatably and reciprocably movable in the cylinder between a retracted positon and an extended position for pumping liquid from the inlet port to the outlet port, the piston including a free end having a recessed section alternately in fluid communication with the inlet port and the outlet port; a pivoting assembly pivotally connected to a drive motor which rotatably and reciprocably drives the piston in the cylinder; and an extension assembly for connecting the pivoting assembly to the piston and for ensuring that the pivoting assembly and the drive motor are positioned out of the body of liquid when the piston and cylinder are positioned in the body of liquid, the extension assembly including a shaft extension for connecting the pivoting