Abstract: A method for controlling pitch in papermaking systems which comprises the step of adding a hydrophobic polyelectrolyte copolymer coagulant to pulp and paper process water. The hydrophobic polyelectrolyte copolymer coagulant comprises diallyldimethylammonium chloride and a hydrophobic monomer selected from the group consisting of: quaternized dimethylaminoethylacrylates and quaternized dimethylaminoethylmethacrylates.

Abstract: A metallic sealing ring which in radial cross-section is hollow and of sinuous profile having axial end faces sinuously curved so as each to define an axially outward facing deep peripheral groove, the interior of the ring profile being in communication with the exterior thereof.

Abstract: A fluidized bed boiler or reactor comprising a housing, a reaction (furnace) chamber within the housing, air distribution means within the reaction chamber, a plurality of perimeter walls approximately vertically disposed and arranged about the interior walls of the housing so as to define the reaction chamber, wherein the improvement comprises: providing at least a portion of the vertically disposed perimeter walls with an outward slope sufficient to reduce or eliminate erosion of the perimeter walls caused by impact from entrained solid particles contained within the reaction chamber.

Abstract: A bi-directional valve assembly disposed within an infusion system to permit the administration of an infusion solution without the use of a needle, the bi-directional valve assembly is a two-way spring valve which comprises: a spring means, a valve port, and a valve plunger having a sealing means and a conduit means disposed thereabout, wherein the spring means is connected to the valve plunger in such a way as to permit the opening of the conduit means when the spring means is recoiled such that the sealing means is not in contact with the valve port and to permit the closing of the conduit means when the spring means is expanded such that the sealing means is in contact with the valve port; whereby the bi-directional valve assembly is capable of opening and closing the infusion system.

Abstract: A colloidal silica slurry comprising: a low metals ammonium-stabilized silica sol having the following characteristics: SiO.sub.2 present in the range between about 15 to about 50 weight percent; a pH in the range between about 8.5 to about 11.3; a particle diameter in the range between about 4.0 to about 130 nm; aluminum, as Al, present in an amount less than about 100 ppm, based on SiO.sub.2 ; iron, as Fe, present in an amount less than about 50 ppm, based on SiO.sub.2 ; potassium, as K, present in an amount less than about 25 ppm, based on SiO.sub.2 ; and sodium, as Na, present in an amount less than about 500 ppm, based on SiO.sub.2 ; and a bactericide, a polishing rate accelerator which differs from the bactericide, and/or a sodium chlorite or sodium hypochlorite biocide. Optionally, a fungicide may also be added to the colloidal silica slurry to inhibit fungi growth.

Abstract: A flocculating agent which comprises: a particulate ethylene oxide polymer present in an amount of between about 20 to about 35% by weight; an inert liquid vehicle comprising a mixture of a glycol which is present in an amount between about 25 to about 30% by weight, and glycerine which is present in an amount between about 45 to about 50% by weight, wherein the specific gravity of the ethylene oxide polymer is approximately the same as the specific gravity of the inert liquid vehicle; and a suspension agent which is present in an amount between about 0.4 to about 0.6% by weight, wherein the flocculating agent has a viscosity in the range between about 1800 to about 5900 cps.

Abstract: A water-soluble dispersant which aids in the dispersion of polyester fibers during the preparation of a wet-laid nonwoven fiber mat, the water-soluble dispersant comprising:polyethylene glycol in an amount greater than about 80% by weight of the water-soluble dispersant:a phthalic acid ester moiety; anda monomeric glycol, wherein the phthalic acid ester moiety and the monomeric glycol are present in an amount less than about 20% by weight of the water-soluble dispersant.

Abstract: An infectious waste disposal container assembly which comprises a receptacle housing, an aperture with an elongated neck portion and an aperture closure means. The aperture of the container assembly being capable of providing access to the interior of the receptacle housing and the aperture closure means having a shape such that it can be removed from the container assembly, inverted and inserted into the elongated neck portion via the aperture such that infectious waste contained within the receptacle housing cannot escape through the aperture.

Abstract: A liquid aluminum phosphate salt gelling agent comprising the reaction product of: a dialkyl phosphate formed from the reaction product of (1) a polyphosphate intermediate produced by reacting triethyl phosphate and phosphorous pentoxide and (2) a mixture of aliphatic alcohols having 6 to 10 carbons in their alkyl groups; an aluminum sulfate; and a solvent.

Abstract: A process for making an alkoxylated vinyl polymer comprising the steps of vinyl polymerizing at least one hydrophobic monomer and at least one hydrophilic monomer in the presence of a initiator and at a temperature of about 70.degree.-160.degree. C. Alkoxylate said vinyl polymer with at least one alkylene oxide selected from the group consisting of ethylene oxide, propylene oxide, and butylene oxide wherein said alkylene oxide is present in an amount of 2 to 40%.

Abstract: A static seal capable of accommodating significant lack of flatness comprises a PTFE envelope 1, within which is a filling 5 consisting of wound or nested turns of thin metal strip 7 perforated to provide resiliance in the direction of their width. Individual turns can move or collapse to different extents, thereby accommodating lack of flatness of surfaces to be sealed. Turns of fluid-impervious material may be distributed among the turns of perforated strip.

Abstract: A method of treating BCTMP/CTMP wastewater to improve retention and purification of cellulose fiber suspension and clarification of the BCTMP/CTMP wastewater which comprises the addition of a cationic, water soluble coagulant having a molecular weight less than 15,000,000 in an amount of about 1 to about 300 ppm; and a high molecular weight flocculant selected from the group consisting of: nonionic polymers having a molecular weight in the range between about 500,000 to about 30,000,000, low charge cationic polymers having a molecular weight in the range between about 5,000,000 to about 30,000,000, and low charge anionic polymers having a molecular weight in the range between about 5,000,000 to about 30,000,000, in an amount of about 0.1 to about 100 ppm.

Abstract: A flocculating agent which comprises: a particulate ethylene oxide polymer present in an amount of between about 20 to about 35% by weight; an inert liquid vehicle comprising a mixture of a glycol which is present in an amount between about 25 to about 30% by weight, and glycerine which is present in an amount between about 45 to about 50% by weight, wherein the specific gravity of the ethylene oxide polymer is approximately the same as the specific gravity of the inert liquid vehicle; and a suspension agent which is present in an amount between about 0.4 to about 0.6% by weight, wherein the flocculating agent has a viscosity in the range between about 1800 to about 5900 cps.

Abstract: A process for forming an oil well cement composition comprising: mixing cement and a vinyl grafted wattle tannin fluid loss additive, the vinyl grafted wattle tannin comprising a wattle tannin grafted with at least one vinyl monomer selected from the group consisting of: 2-acrylamido-2-methylpropanesulfonic acid and acrylamide, wherein the wattle tannin is present in an amount of between about 0.05 to about 14 weight percent based on actives, the 2-acrylamido-2-methylpropanesulfonic acid is present in an amount of between about 68 to about 99.95 percent, and acrylamide is present in an amount of between about 0 to about 18 percent, to form a cement blend; and mixing the cement blend with water.

Abstract: A process for forming an oil well cement composition comprising: mixing cement and a vinyl grafted wattle tannin fluid loss additive, the vinyl grafted wattle tannin comprising a wattle tannin grafted with at least one vinyl monomer selected from the group consisting of: 2-acrylamido-2-methylpropanesulfonic acid and acrylamide, wherein the wattel tannin is present in an amount of between about 2 to about 14 weight percent based on actives, the 2-acrylamido-2-methylpropanesulfonic acid is present in an amount of between about 84 to about 98 percent, and acrylamide is present in an amount of between about 0 to about 4 percent, to form a cement blend; and mixing the cement blend with water.

Abstract: A process in which fine paper is made by forming an aqueous cellulosic suspension comprising fibers, a precipitated calcium carbonate filler and a cationic starch strengthening agent, passing the suspension through one or more shear stages, draining the suspension to form a sheet and drying the sheet. The retention and drainage properties of the suspension are substantially improved via the addition of a cationic coagulant having a molecular weight in the range between about 2,000 to about 500,000 to the suspension prior to any of the shear stages, an anionic flocculant having a molecular weight of at least 500,000 to the suspension after the low molecular weight coagulant but before any of the shear stages, and an inorganic material selected from the group consisting of: bentonite, colloidal silica and other inorganic microparticle materials, to the suspension after at least one of the shear stages.

Abstract: A random number generator comprising a housing with a mixing chamber, an air chamber, and an air distribution plate disposed between the mixing chamber and the air chamber. A plurality of numbered balls are disposed within the mixing chamber. An upflow air means for providing an upflow air stream is disposed within the air chamber and is capable of mixing and propelling the balls upward within the mixing chamber. A plurality of ball collection columns are attached to the housing, preferably near the top of the housing. Each ball collection column comprises a vacuum-creating means for withdrawing at least one of the balls from the mixing chamber into the ball collection column and a retaining means for retaining the ball within the ball collection column; whereby a combination of numbered balls may be collected within the ball collection columns so as to provide a random list of numbers.

Abstract: A liquid aluminum phosphate salt gelling agent comprising the reaction product of: a dialkyl phosphate formed from the reaction product of (1) a polyphosphate intermediate produced by reacting triethyl phosphate and phosphorous pentoxide and (2) a mixture of aliphatic alcohols having 6 to 10 carbons in their alkyl groups; an aluminum sulfate; and a solvent.

Abstract: A watercooled rotary combustor comprising a plurality of pipes or tubes secured together, means mounting the plurality of pipes or tubes for rotation about the axis of the inner surface with the axis being horizontally tilted so as to have a high end and a low end, means for rotating the plurality of pipes or tubes on the mounting, a feeding chute into which burnable waste material can be stacked which opens into the high end of the combustor, the pipes or tubes being interconnected for circulating water flow and having a water input line and a water/steam discharge line, means for circulating water through the lines including a steam drum connected to the discharge line for separating steam from the water, the pipes or tubes being secured so as to define a plurality of intermediate openings so that the inner surface of the combustor is gas porous, and means for delivering controlled amounts of combustion air for burning through selected portions of the porous surface, the improvement comprising, a combustor

Abstract: A rotary fluid bed gasifier which comprises: a rotatable drum having a circumferentially extending wall which is permeable to gases; a means for feeding a fluidizing gas through the wall into the drum; a bed of particles which, at least when the gasifier is in use, is supported on an internal face of the wall and is fluidized by the fluidizing gas; an outlet means for receiving a carbonaceous material from outside the gasifier and delivering the carbonaceous material to the drum; a means for introducing steam into the drum; a de-NO.sub.x boiler having a quench zone and a nitrogen fixing zone; a means for introducing secondary air disposed between the quench zone and the nitrogen fixing zone; and a means for introducing tertiary air disposed between the de-NO.sub.x boiler and a main boiler or furnace.