Abstract: A new method for removing HF and related organic fluorides from fluid streams in which the fluoride species exist as impurities and, in particular, from hydrocarbon fluid streams containing no more than about 1.0% by weight total combined fluorides. The method consists of contacting the fluid stream with an adsorbent consisting essentially of activated alumina that has been treated with a promoter material selected from the oxides and phosphates of alkali metals and alkaline earth metals, and mixtures thereof. This is preferably accomplished by providing a suitable absorber vessel charged with the adsorbent to form a fixed bed, and then conducting the fluoride-contaminated fluid through the fixed bed, either in a downflow or an upflow manner.

Abstract: A heat supply system is provided which enables use of small pipes with the same diameter for both feed branch pipes and return branch pipes, thus reducing the initial cost and also suppressing heat emission loss. The heat supply system comprises a heat exchanger 1, a feed main pipe 2, a return main pipe 3, a feed branch pipe 4 connected to the feed main pipe 2, a first return branch pipe 5 for directing the flow of a heat medium to an edge section in the downstream side of the feed branch pipe 4, a plurality of load pipes connected in parallel to a section between the feed branch pipe 4 and the first return branch pipe 5 each having a load member 7 provided thereon, and a second return branch pipe 6 connected to a section between an edge section in the downstream side of the first return branch pipe 5 and the return main pipe 3, said heat supply system having a plurality of branch pipe paths 11 including therein the feed branch pipe 4, first return branch pipe 5, load pipe 8, and second branch pipe 6.

Abstract: The present invention provides a heat-exchange coil assembly making it possible to enlarge a heat conduction area within a limited volume by lowering the pitch between heat-exchange coils to a minimum level without providing a welding space. The heat-exchange coil assembly comprises an inlet header 2 at an end section thereof, an inlet tube 3 for inletting a heat exchange medium provided in a drum, an outlet header 4 located with a space from the inlet header at an end section thereof, and a plurality of heat-exchange coils with the outlet tube 5 for outletting a heat-exchange medium from the drum, inlet header 2, and outlet header 4 communicated to each other and also having a common center line, in which the heat-exchange coils are alternately linked to both sides of the inlet header 2 and outlet header 4.

Abstract: The present invention relates to catalyst support comprising an inorganic oxide, preferably alumina, and zeolite in the proton form and having a high Si/Al ratio, wherein the zeolite is selected from those protonated zeolites that would exhibit a high Na/Al mole ratio if treated with a solution of sodium nitrate until all sites that will accept a sodium ion have done so. This invention also relates to catalyst that is made from such support, to a method of treating exhaust gas from “lean-burn” engines using catalyst of this invention, and to a method for determining if a zeolite is a suitable support component.

Abstract: The invention provides a catalyst which can convert methane, carbon monoxide, and nitrogen oxides in lean, stoichiometric, and rich air/fuel environments. Support (A) of the catalyst comprises an alumina support impregnated with Pd providing lean methane conversions and support (B) of the catalyst comprises ceria/lanthana/alumina impregnated with Pd providing stoichiometric methane conversion. Rhodium may be substituted for all or part of the Pd on an alumina support.

Abstract: Removal of carbon monoxide, hydrocarbons, and nitrogen oxides from the exhaust gas from lean-burn, diesel and other engines which produce exhaust gases containing excess oxygen is provided by a multi-component catalyst having at least two catalytic components, each capable of reducing nitrogen oxides within a range of exhaust gas temperatures that is different from the range of exhaust gas temperatures within which each other component is capable of reducing nitrogen oxides. Oxidation of the remaining reducing gases is also accomplished. One example of a two catalytic component catalyst of this invention has a first component of Au supported on alumina, which reduces nitrogen oxides at exhaust gas temperatures between about 600.degree. C. and 900.degree. C., and a second component of Pt supported on Y-zeolite, which reduces nitrogen oxides at exhaust gas temperatures below 600.degree. C.; an example of a three catalytic component catalyst of this invention has a first component of CoO supported on .gamma.

Abstract: A disposable container for safe disposal of used pen syringe needles includes a plurality of walls defining a receptacle for receiving used needles therein. The container is provided with an axially extending passage through which needles are deposited within the container. The axial passage is formed by a downwardly extending truncated cone integrally formed with the cover of the container. The truncated cone includes gripping means for holding a needle for depositing into the container. A cap member pivotally connected to the cover of the container includes a plunger which upon closure of the cap member extends through the axial passage forcing the needle held by the gripping means into the container. When the container is not in use, the cap member seals the open axial passage and is maintained in locking engagement with the container.

Abstract: A method of making a unique, promoted support for improved catalysts for conversion of exhaust from internal combustion engines, said support comprising a mixed-metal-oxide promoter containing at least Ce and Zr substantially uniformly dispersed as homogeneous crystallites of less than about 100 .ANG. on a high-surface-area refractory oxide support substrate, comprising dissolving a combination of Ce- and Zr-oxide precursors, and optionally another metal oxide precursor, and a compatible organic depositing agent, slowly heating to transform the depositing agent into a gel-like matrix coating the substrate in which the mixed-metal-oxide precursor compounds are uniformly distributed and thereafter calcining to burn off the organic matrix and form the appropriate oxide morphology.

Abstract: The present invention discloses a method of making materials and coatings formed from multiple component compositions characterized by improved uniformity, improved dispersion and/or improved homogeneity on the atomic, nanometer, or sub micron scale. These compositions are prepared by forming a mixture of component precursors in the presence of at least one suitable organic reagent and a solvent. Suitable reagents include those in which the sum of the hydroxy and carboxy groups contained in their molecular structure is at least two, which form a rigid, gel-like matrix upon suitable treatment and which decompose completely at high temperatures, leaving no residue. This method is useful for making compositions that are useful in the production of ceramics, supports, catalysts, modified supports, electronics, coatings, films, laminates, superconductors and similar products.

Abstract: A vertically adjustable, multi-position chair arm assembly includes a flat metal support bracket having a generally straight uppermost section. The chair arm assembly further includes a plastic shell housing mounted on the generally straight section of the support tube. The single piece shell housing retains a pair of mating sleeves which seat and lock in the draft angle of the shell housing. The uppermost section of the metal support bracket is enclosed by a molded plastic cover. The mating sleeves provide a channel for receiving and retaining the plastic covered section of the metal support bracket. The sleeve channel provides a plastic to plastic interface whereby the total material tolerances are significantly reduced and thereby minimizing wobble. A locking mechanism housed within the shell housing is in positive locking engagement with a punched locking rack formed in the metal support bracket.

Abstract: A split sleeve bushing for providing a tight fit between a support post and chair base comprises two hemi-cylindrical components which mount about the support post and are received within the support post receptacle of the chair base. The split sleeve bushing includes external stability rings and vertical ribs extending along the external surface thereof. The vertical ribs are tapered to match the draft angle of the support post receptacle of the chair base. The upper end of the split sleeve bushing includes a circumferential flange which is slotted for snap lock engagement with the chair base.

Abstract: An SO.sub.2 -tolerant catalyst for reducing NO.sub.x, in exhaust gas from internal combustion, wherein the exhaust gas contains unburnt hydrocarbons and oxygen comprising silver oxide dispersed on alumina characterized in that such catalyst is white in color.

Abstract: Removal of carbon monoxide, hydrocarbons, and nitrogen oxides from the exhaust gas from lean-burn, diesel and other engines which produce exhaust gases containing oxygen in substantial excess of stoichiometric is provided by catalysts containing platinum alloyed with cobalt, nickel, copper, rhodium, palladium, silver or gold. Alloying is accomplished by thermal treatment or by colloidal methods. The catalysts are capable of reducing nitrogen oxides (NO.sub.x) within a predetermined range of engine operating temperatures.

Abstract: Methods of making substantially phase-pure and thermally stable crystalline alumina compositions stabilized with an oxide of silicon, germanium, phosphorus, arsenic or a mixture thereof. Also provided are crystalline alumina compositions and catalyst supports made using these methods.

Abstract: A process for the removal of carbon monoxide, hydrocarbons, and nitrogen oxides in an oxidizing exhaust gas comprising contacting the exhaust gas with a catalyst comprising a crystalline zeolite having the following characteristics:a) a Si/Al atomic ratio between 5 and 100;b) a pore size in the range of from about 0.5 to about 1.3 nm;c) essentially no octahedral aluminum detectable by .sub.27 Al NMR spectroscopy;d) a sodium ion exchange capacity, with regard to total aluminum content, of greater than 75%;e) a copper content in the range of from about 0.5 wt. % to about 12 wt. %; andf) a silver content in the range of from about 0.25 wt. % to about 20 wt. %.

Abstract: Aeration system for a multi-storied building 10 having living space 11 on each floor, wherein an air supply hole for letting in outdoor air is located in a lower section of the living space, and an air exhaust hole is located in an upper section of the living space. An air supply path and an air exhaust path are connected to the air supply hole and air exhaust hole of each living space. Said air supply path and said air exhaust path extend in opposite vertical directions. All holes and paths in their said locations and directions respectively are provided on each floor.

Abstract: A catalyst for the removal of carbon monoxide, hydrocarbons and nitrogen oxides in an exhaust gas made by a process comprising:a) preparing a suspension comprising a liquid, a zeolite, a weak base, and salts of copper and silver,said zeolite being crystalline and having a Si/Al atomic ratio between about 5 and about 100, a pore size between about 0.5 nm and about 1.3 nm, essentially no octahedral aluminum detectable by .sup.27 Al NMR spectroscopy and a sodium ion exchange capacity, with regard to total aluminum content, greater than 75%, and wherein said suspension contains sufficient amounts of said copper and silver salts to result in a copper content in said catalyst, when finished, between about 0.5 wt. % and about 12 wt. % and a silver content between about 0.25 wt. % and about 20 wt.

Abstract: A catalytic converter for treating exhaust gas from an internal combustion engine containing a catalyst characterized by having platinum or a platinum alloy dispersed predominately on the exterior surface of molecular sieve crystals. Also provided is a catalyst for such a converter and processes for manufacture of such catalyst. In addition, a process for treating exhaust gas from an internal combustion engine to reduce the amounts of hydrocarbon, carbon monoxide and nitrogen oxides emitted to the atmosphere is included.

Abstract: Removal of carbon monoxide, hydrocarbons, and nitrogen oxides from the exhaust gas from lean-burn, diesel and other engines which produce exhaust gases containing excess oxygen is provided by at least two catalysts in sequence, each capable of reducing nitrogen oxides within a particular range of engine operating temperatures. Oxidation of the remaining reducing gases is also accomplished.