Abstract: A method is described for decomposing cyanuric acid at temperatures of less than about 1000.degree. F., and the method comprises heating the cyanuric acid in the presence of a decomposition catalyst which is effective at below about 1000.degree. F. Examples of useful decomposition catalysts are zirconium, phosphorus and mixtures thereof. Preferably at least some of the zirconium or phosphorus is in the plus four oxidation state. A method also is described for reducing the nitrogen oxide content of gas streams which comprises contacting the gas streams containing nitrogen oxide with an amount of the gaseous decomposition product mixture obtained by decomposing cyanuric acid in the presence of a decomposition catalyst at a temperature of less than about 1000.degree. F.

Abstract: Phosphorous acid is made by a continuous recycling process from a mixture of phosphorous and hydrochloric acids, comprising:(i) continuously recycling the mixture in a loop apparatus;(ii) adding water to and passing phosphorus trichloride into said recycling mixture so as to generate a condition of turbulent flow at the point of contact of the phosphorus trichloride and the recycling mixture, whereby a reaction product, comprising an aqueous solution of phosphorous and hydrochloric acids as a continuous liquid phase and gaseous hydrogen chloride as gas bubbles of disperse phase, is produced;(iii) separating said gaseous hydrogen chloride;(iv) cooling said reaction product; and(v) recycling at least a portion of said reaction product and repeating steps (ii), (iii) and (iv) thereon to produce a more highly concentrated solution of phosphorus acid.

Abstract: A catalyst mixture of platinum, rhodium, and rhenium is employed in the combustion of gaseous, liquid and/or solid fuel in combustion chambers such as diesel and gasoline engines, for reduction of pollution emitted from the combustion chambers. The platinum serves as a catalyst with carbon and carbon monoxide to produce carbon dioxide, the rhodium serves for reducing oxides of nitrogen to nitrogen gas and oxygen gas, and the rhenium serves as a catalytic promoter for the catalytic functions of the platinum and the rhodium. The rhodium also promotes the catalytic action of the platinum. The catalytic mixture is introduced into a flame zone of a combustion chamber in any convenient manner, such as by use of an air draft. The composition of the mixture is as follows, namely, 1-9 milligrams of platinum, 0.3-3 milligrams rhodium, and 0.3-3 milligrams rhenium for treating 24 kilograms of fuel.

Abstract: Trialkyl arsine (in particular trimethyl arsine) is removed from a fluid (e.g., a hydrocarbon-containing gas) by contacting the fluid with a sorbent material comprising (a) elemental sulfur, and (b) an inorganic support material, preferably alumina and/or silica and/or titania and/or activated carbon.

Abstract: A process for the reduction of nitrogen oxides in flue gases and engine exhaust gases is improved by contacting the gases with a zeolite catalyst containing oxides of the transition elements from Periods 4, 5 and 6 of the Periodic Table of Elements or oxides of the rare earths. In particular, faujasite zeolites, mordenites and SiO.sub.2 -rich zeolites are preferred.

Abstract: Disclosed is a process for treating a waste stream containing calcium sulfate by depositing said waste stream on a gypstack, collecting the leachate from the gypstack, and recovering the P.sub.2 O.sub.5 values therefrom. Also disclosed is apparatus comprising means for depositing a waste stream containing calcium sulfate on a gypstack, means for collecting the leachate from the gypstack, and means for recovering the P.sub.2 O.sub.5 values therefrom. Preferably, at least about 25% of the calcium sulfate is calcium sulfate hemihydrate.

Abstract: Sulfur dioxide (SO.sub.2) can be oxidized to rapidly sulfur trioxide (SO.sub.3) in a high temperature environment. It has been found that the SO.sub.2 oxidation rate can be impeded by a high rate of temperature reduction in a dynamic condition such as in a boiler and the ductwork of a power plant and an industrial plant. The mechanism of the reaction kinetics has been developed. With the understanding of the mechanism, the methods for oxidation of SO.sub.2 to form SO.sub.3 have been developed. The SO.sub.3 rich flue gas is treated with lime (CaO) in a fluidized lime reactor wherein SO.sub.3 reacts with CaO to form CaSO.sub.4 coating on the surface of CaO. The high heat generated from the SO.sub.3 /CaO reaction causes the remaining SO.sub.2 to convert in the reactor to SO.sub.3 which in turn reacts with CaO to form more CaSO.sub.4. Nitrogen oxides can also be removed from flue gas by converting nitric oxide (NO) to nitrogen dioxide (NO.sub.

Abstract: Sulfur dioxide is removed from flue gases using an aqueous solution of magnesium components in a wet scrubber, with oxidation of a portion of the aqueous discharge from the scrubber. Calcium sulfate is added to the portion of aqueous discharge at the oxidizer to form an oxidized aqueous effluent containing calcium sulfate solids and dissolved magnesium sulfate. The oxidized aqueous effluent is regenerated by addition of lime, in a regeneration tank, which precipitates calcium sulfate as gypsum, with gypsum returned to the oxidizer as the calcium sulfate added thereto. Preferably, the aqueous discharge from the scrubber is divided, with a major portion passed to a separator to remove gypsum, therefrom, while a minor portion is passed to the regeneration tank. Magnesium sulfate solution, after separation of gypsum from the major portion may also be fed to the regeneration tank.

Abstract: A wet scrubbing process for removing sulfur dioxide from combustion gases uses an aqueous slurry containing calcium components resulting from the slaking of lime, with the slaked lime formed by mixing lime with water containing a calcium sulfur-oxide salt. The presence of the calcium sulfur oxide salt in the slaking water results in a more easily dewatered sludge that is subsequently removed from the wet scrubbing system.

Abstract: A self-reactivating denitrating method and equipment in which the exhaust gas from the combustor flows and goes through an adsorbing catalyst tower filled with Cu(II) exchangeable high silica zeolite at a temperature of normal to 750.degree. C. to let NOx contained in the exhaust gas be adsorbed in the zeolite and decomposed into N.sub.2 and O.sub.2 resulting in achievement of cleaning the exhaust gas and then the zeolite saturated with NOx is put in touch countercurrently with air for combustion to let the adsorbed NOx be desorbed to reactivate Cu(II)exchangeable high silica zeolite and, at the same time, the air for combustion containing the adsorbed NOx is sent into the furnace of the combustor to decompose a part of NOx into N.sub.2 and O.sub.2 under an interfurnace combustion atmosphere.

Abstract: A catalyst and a method for catalytically decomposing nitrogen oxides; the catalyst being composed of a zeolite having a mole ratio of SiO.sub.2 /Al.sub.2 O.sub.3 of at least 20 and containing copper ions and magnesium ions.

Abstract: Process for the removal of isocyanic acid from a gaseous mixture of isocyanic acid and ammonia by introducing a tertiary amine or ether at 250.degree. to 600.degree. C. The gaseous reaction mixture is passed into an inert diluent and cooled, to condense an adduct of isocyanic acid and tertiary amine or ether, and the ammonia being removed as a gas.

Abstract: A method is described for reducing the nitrogen oxide content of an effluent gas stream which comprises contacting the effluent gas with an amount of formaldehyde which is effective in reducing the nitrogen oxide content of the gas. In one preferred embodiment, the formaldehyde is contacted with the effluent stream in the presence of a catalyst which promotes the reaction between the formaldehyde and the nitrogen oxide contained in the gas stream. Preferred catalysts comprise zirconium, cerium, or mixtures thereof. Catalysts comprising zirconium in the plus four oxidation state, cerium in the plus four oxidation state, or mixtures thereof are particularly preferred catalysts.

Abstract: The rates of oxidation of sulfite/bisulfite-containing solutions in gas-liquid scrubbers for removing SO.sub.2 from gases are reduced by adding oxidation inhibitors to the solutions in an amount of from 0.02 to 20 mmol per hour and per square meter of exchange area.

Abstract: The present invention relates to a process and apparatus for purifying waste gases by scrubbing with an adsorbent suspension. The adsorbent suspension in a concentration from 40 g/l to 200 g/l is here distributed uniformly or almost uniformly in at least one gas-scrubbing device, passed through at least one ordered mass transfer zone and contacted with the gas and then passed into at least one separately arranged reactor, the biologically degradable or convertible impurities are reacted, with the additional use of aerobic bacteria and oxygen, with forced motion and the purified liquid or suspension is recycled, wholly or as part stream, to the gas-scrubbing device, distributed therein and contacted again with the gas which is to be purified.

Abstract: A method and equipment for desulfurizing exhaust gas from a combustor in which the exhaust gas containing SO.sub.2 from the combustor is brought into contact with SO.sub.2 absorbent to remove SO.sub.2 and is blown down out of the system; on the other hand, the SO.sub.2 absorbent absorbed SO.sub.2 is brought into contact with air to desorb SO.sub.2 and the air containing the desorbed SO.sub.2 is supplied to the combustor as air for combustion to burn to raise the SO.sub.2 concentration in the exhaust gas from the combustor; and the exhaust gas not undergone contact with the absorbent or a part of the air undergone contact with the SO.sub.2 absorbent are taken out of the system.

Abstract: Amorphous red phosphorus useful for matches, or as flame retardant is made by forming a slurry of 10-45% red phosphorus in molten white phosphorus, reducing the content of yellow phosphorus to less than 20% of the red phosphorus by separation at less than 280.degree. C., and then heating the product at above 295.degree. C. to convert, and preferably also evaporate, the white phosphorus.

Abstract: Provided is a process for producing hydroxylapatite suitable for chromatographic separation of biopolymers. The process comprises allowing hexagonal prismatic or acicular monetite to react with potassium hydroxide and/or lithium hydroxide under heating.

Abstract: The present invention is an integrated process for the adsorptive recovery of a high purity carbon monoxide product from a gas mixture containing hydrogen, carbon monoxide, carbon dioxide, methane, and nitrogen, with the potential additional recovery of a hydrogen-rich stream and the recycle of the resulting gas mixture to a reformation reaction to produce the gas mixture with a more favorable carbon monoxide and hydrogen product slate. Separate carbon dioxide recovery can be performed. Hydrogen recovery can be either by adsorptive or by membrane technology. The process achieves high recoveries at reduced capital cost and at reduced product cost.

Abstract: A catalyst bed having a mechanism for supporting catalyst blocks for transport through a flue to treat the flue gas, the mechanism functioning to permit removal of blocks from the flue for conditioning or replacement while permitting continuous operation of the catalyst bed.