Abstract: Disclosed is a granular calcium hypochlorite composition having a calcium hypochlorite content of at least 55 wt. % and composed of particles having an ellipsoidal shape in section, wherein at least 50 wt. % of the ellipsoidal particles have a short diameter of 0.3-5 mm, a long diameter of 0.5-20 mm, and a long diameter/short diameter ratio larger than 1.5 but not larger than 5. This composition is prepared by a process wherein a wet calcium hypochlorite composition comprising at least 40 wt. % of calcium hypochlorite and 25-45 wt.% of water is extruded through a die having an orifice diameter of 0.3-5 mm; the extrudate is cut to a length of 0.5-20 mm so that the length/orifice diameter ratio is larger than 1.5 but not larger than 5 to form columnar shaped particles; the columnar shaped particles are subjected to rolling granulation; and the resulting granules are dried until the water content is reduced to 4-22 wt. %.

Abstract: A process for preparing nodular pigmentary titanium dioxide by grinding and mixing a titanium-bearing material, such as sorelslag, with an alkali metal compound such as sodium hydroxide, and roasting the mixture. The roasted material is ground followed by washing and filtering. Thereafter, the solid residue is digested with hydrochloric acid for a time and temperature sufficient to form nodular-shaped solids. After removing the acid by filtration and washing the solid residue, the residue is calcined to provide a nodular titanium dioxide pigment.

Abstract: The invention is a catalytic process for removing H.sub.2 S and hydrogen polysulfides from liquid sulfur. The process comprises mixing a heterocyclic compound with the liquid sulfur and removing the hydrogen sulfide from the liquid sulfur by contact with a gas which is inert to the liquid sulfur at the treating temperature.

Abstract: A control system is provided for a mist scrubbing process in which a gas containing odorous and acidic contaminants is cocurrently contacted in a reaction chamber with tiny droplets of an aqueous reagent to react with and destroy the contaminants. The reagent contains an oxidizing agent and a base and the process is controlled by measuring a property, typically pH, of spent spray liquid settling at the bottom of the chamber. That measurement is used to meter the flow rate of base into the system while at the same time the concentration of an acidic contaminant in the scrubbed gas stream leaving the reaction chamber is measured and that measurement is used to meter the injection rate of an oxidizing agent into the system.

Abstract: The present invention is a process for producing a high-purity argon stream from a feed gas containing nitrogen, oxygen and at least 85 mole % argon, Nitrogen is absorbed from the stream followed by catalytic hydrogenation to remove oxygen. The absorption column is regenerated at a preset low pressure using the nitrogen-depleted stream from the absorption unit as the purge gas.

Abstract: A method for controlling the water present in hydrogen fluoride is described which effectively removes all the water contained in the hydrogen fluoride solution to form other compounds that either have extremely low vapor pressure or are acceptable in a process such as chemical vapor purification. The method involves as one of the steps the contacting of a reactive metal halide with a hydrogen fluoride containing water. The metal halide reacts with the water contained in the hydrogen fluoride solution yielding a metal oxide, hydrogen halide, and anhydrous hydrogen fluoride. The metal oxide is a solid, with low vapor pressure, thereby effectively removing oxygen-bearing species from the hydrogen fluoride.

Abstract: A multistage process for preparing pure BF.sub.3 from hexafluorosilicic acid, H.sub.2 SiF.sub.6, comprises reacting H.sub.2 SiF.sub.6 with oxygen acids of boron and/or boron oxide in the first stage to give hydroxyfluoroboric acid and silica, filtering off the silica and concentrating the hydroxyfluoroboric acid, adding oleum to the concentrate and then heating to form gaseous BF.sub.3.

Abstract: A method of removing low levels of ethylene oxide (1% by volume or less) from ethylene oxide contaminated gases is provided. The removal is effected by contacting the ethylene oxide with a solid, cationic ion exchange resin at conditions such that the quantity of water present in the reaction zone is at a level such that the reaction of the ethylene oxide with resin occurs at a gas-solid interface to form an ethylene oxide derivative polymer which is bound to said resin.

Abstract: Aluminum alkyl vapor is removed from a gas stream by scrubbing with a hydrocarbon scrubbing liquid containing a long chain carboxylic acid dissolved therein.

Abstract: A method for recovering sulfur from a solid sulfur-containing catalyst is disclosed which comprises contacting the catalyst with liquid anhydrous ammonia in order to leach the sulfur out of the catalyst, and form an ammonia-sulfur solution. The sulfur is recovered by separating the ammonia from the solution, preferably by evaporation. The catalyst used in this method is also rendered suitable for reuse. The principal utility of the invention is in the ultimate conversion of phosphogypsum, produced primarily in the fertilizer industry, into sulfur so that it can be recycled back into the industry.

Abstract: A process for producing acicular .alpha.-FeOOH particle powder having a narrow particle size distribution and a rectified shape and being highly dispersed is provided, which process comprises mixing with stirring an aqueous solution of a Fe(II) salt with an aqueous solution of an alkali in an equivalent ratio of alkali to Fe(II) salt of 1.5 or more, oxidizing the mixture with a O.sub.2 -containing gas, heat treating the resulting suspension of iron .alpha.-FeOOH particle powder to 60.degree. to 100.degree. C., further adding an aqueous solution of a FE(II) salt in a proportion of atom to molecule of Fe(II)/.alpha.-FeOOH of 0.5 to 10% and again oxidizing the mixture with a O.sub.2 -containing gas at 35.degree. to 55.degree. C.

Abstract: A method for preventing anhydrous potassium fluoride from solidification by causing the anhydrous potassium fluoride to absorb carbon dioxide gas.

Abstract: A method of stabilizing the switching characteristics of a thin film chalcogenide glass material by subjecting said material to a hydrogenated atmosphere, preferably activated hydrogen and argon. It is also preferred to provide a post hydrogenation anneal step.

Abstract: The preparation of carbon fluoride and carbon fluoride chloride from a graphite intercalate is described. Treatment of group V-A pentahalide intercalates of graphite with fluorine or fluorine/chlorine gas mixtures at a temperature of about 300.degree. C. results in the production of highly fluorinated CF.sub.x ; X.gtoreq.1 or (C.sub.y F.sub.x Cl.sub.z).sub.n ;x.gtoreq.1.0, y=1.In the process, carbon fluoride or carbon fluoride chloride can be prepared from a highly ordered graphitic carbon at a temperature substantially lower than that of the decomposition temperature of the product, CF.sub.x or (C.sub.y F.sub.x Cl.sub.z).sub.n. In particular, carbon fluoride or carbon fluoride chloride is prepared from a group V-A pentahalogen intercalate and fluorine gas or fluorine/chlorine gas mixtures at temperatures in the order of 250.degree.-300.degree. C.