Abstract: A pregnant liquor is mixed with an organic mixture comprised of an organic extracting agent and iso-butyl-heptyl ketone. Metallic values are absorbed from the pregnant liquor by the organic mixture. The metal-bearing organic mixture is then separated from the liquor and stripped of its metallic values.

Abstract: Processes for carrying out catalytic exothermic and endothermic high-pressure gas reactions with a single-walled pressure vessel or shell containing cross-flow (e.g., radial flow) heat transfer exchangers, a continuous catalytic bed having at least two stages, and means for effecting "cross-over" material flows from "outside" to "inside" (for exothermic reactions) and vice versa (for endothermic reactions), whereby conditions of: maximum gas temperature always being in the core of said vessel or shell, minimal pressure drop, and minimal compression of catalyst particles are achieved, along with significant economic savings in cost of the pressure vessel or shell and catalyst (through extension of catalyst life).

Abstract: Process for separating H.sub.2 S from CO.sub.2, both contained in a treated gas, wherein said gas is contacted with a solution which selectively absorbs H.sub.2 S, wherefrom H.sub.2 S is separated in a regeneration zone, CO.sub.2 being released, said contact step being effected in a contact apparatus comprising 1 to 10 stages each formed of parallel vertical tubes whose bottom portion is provided with injection means of the cyclonic type imparting to the supplied gas and liquid a swirling ascending motion.

Abstract: Highly pure chlorine dioxide is generated very efficiently and safely in a single generator-crystallizer by reducing an alkali metal chlorate with chloride ion in a strong acid in the presence of hydrogen peroxide and a complex catalyst of palladium (II) with chloride ion.

Abstract: A method of storing heat is provided utilizing a chemical cycle which interconverts sulfuric acid and sulfur. The method can be used to levelize the energy obtained from intermittent heat sources, such as solar collectors. Dilute sulfuric acid is concentrated by evaporation of water, and the concentrated sulfuric acid is boiled and decomposed using intense heat from the heat source, forming sulfur dioxide and oxygen. The sulfur dioxide is reacted with water in a disproportionation reaction yielding dilute sulfuric acid, which is recycled, and elemental sulfur. The sulfur has substantial potential chemical energy and represents the storage of a significant portion of the energy obtained from the heat source. The sulfur is burned whenever required to release the stored energy.A particularly advantageous use of the heat storage method is in conjunction with a solar-powered facility which uses the Bunsen reaction in a water-splitting process.

Abstract: A synthetic zeolite material, designated zeolite Nu-5, having a molar composition expressed by the formula; 0.5 to 1.5 R.sub.2 O: Y.sub.2 O.sub.3 : at least 10 XO.sub.2 : 0 to 2000 H.sub.2 O wherein R is a monovalent cation or 1/n of a cation of valency n, X is silicon and or germanium, Y is one or more of aluminium, iron, chromium, vanadium, molybdenum, arsenic, manganese, gallium or boron, and H.sub.2 O is water of hydration additional to water notionally present when R is H, and having a defined X-ray diffraction pattern. Zeolite Nu-5 is a useful catalyst.

Abstract: A carbonaceous material containing vanadium is reacted with an oxidizing gas in a molten salt pool containing an alkali metal carbonate. Vanadium values present in the carbonaceous material are converted to water-soluble vanadium compounds which are recovered from the melt and reacted with a strong acid to precipitate the vanadium values as insoluble vanadates. The vanadates are recovered as product or optionally further converted to vanadium pentoxide.

Abstract: Phosphorus pentasulfide of low reactivity is made by solidifying molten phosphorus pentasulfide on a cooling cylinder that delivers the solidified product at a temperature of 150.degree. to 220.degree. C., and that product is immediately introduced into a heat-insulated container and freed therein from its immanent or sensible heat by cooling at a rate of at most 30.degree. C. per hour without the expenditure of any energy to control the cooling.

Abstract: Stable isocyanic acid compositions containing isocyanic acid in an organic solvent therefor, having a small amount of a labile halide compound, such as carbamoyl chloride.

Abstract: The invention relates to a process for separating seminoble metals or noble metals from aqueous solutions having compounds of these metals dissolved therein, by reaction with yellow phosphorus. More particularly the aqueous solutions are contacted with carrier material having a yellow phosphorus coating applied thereto.It is possible for the aqueous solutions to be conveyed through a zone having the yellow phosphorus-coated carrier material placed therein, and for them to be subsequently conveyed through a further zone having uncoated carrier material placed therein.

Abstract: The process for recovering recyclable sulphur from a strongly colored solution obtained from the production of sulphur dyestuffs containing alkali metal sulfides, alkali metal polysulfides, sulphur dyestuffs or mixtures thereof comprising(a) mixing said solution at an alkaline pH with a decolorizing amount of an iron or zinc compound which is a hydroxide or the salt of an inorganic acid whereby a precipitate is formed,(b) separating the precipitate to isolate a decolorized solution, and either(c) precipitating elemental sulphur from the decolorized solution by adding sulphur dioxide or alkali metal thiosulfate under acidic conditions, and(d) separating the precipitated elemental sulphur, or(e) recycling the decolorized solution for use in the manufacture of sulphur dyestuffs.

Abstract: A method for synthesizing amorphous silicon nitride, wherein silicon halide and ammonia are reacted in a reaction vessel at a high temperature in the absence of oxygen to thereby synthesize powder of amorphous silicon nitride, then the powder is separated from a gas containing therein gaseous ammonia halide which has been produced simultaneously with said amorphous silicon nitride by use of a collecting means, comprises directly mixing, in advance of the separation, cool gas containing therein neither oxygen nor moisture into said gas to cool down said powder and gas so that both substances may be put in said collecting means without deposition of ammonium halide to the inner wall of the reaction vessel, and other component parts.

Abstract: Zeolites of small and uniform size are formed having high magnesium exchange capacities. Zeolite A is disclosed having an average particle size less than 1.7 microns, a calcium carbonate exchange capacity of more than 230 mg calcium carbonate per gram zeolite and a magnesium exchange capacity of more than 140 mg magnesium carbonate per gram zeolite. This zeolite A is produced from a reaction mixture having a water to sodium oxide molar ratio of less than 35:1, and a sodium oxide to silica molar ratio of between 1:1 and 4:1, wherein the silica to alumina molar ratio is greater than 3:1 when the sodium oxide to silica molar ratio is less than 4:3 and the sodium oxide to alumina molar ratio is greater than 4:1 when the sodium oxide to silica molar ratio is greater than 4:3. Zeolite X is disclosed having an average particle size less than 2.

Abstract: A method is provided for effectively tailoring the catalytic activity of porous crystalline zeolites. The method involves loading all channels of a cationic form of the porous zeolite with molten wax, contacting the wax-loaded zeolite with hydrogen fluoride solution in a controlled manner, and calcining the hydrogen fluoride solution contacted zeolite.

Abstract: The scaling of autoclave and leaching-equipment surfaces during the high pressure leaching of nickeliferous oxide and silicate ores is controlled during leaching to favor the formation of scale containing substantial amounts of magnesium sulfate that is more easily removed by chemical dissolution using water or dilute sulfuric acid at temperatures ranging from about 50.degree. C. to 250.degree. C. than scale containing substantial amounts of alunite.

Abstract: A method of producing a highly reactive pitch fraction is disclosed. Coal-tar pitch is extracted with hot chloroform and the pitch solution treated with solid iodine. The solid reaction products are separated and, in the presence of chloroform, decomposed with an aqueous ammonia solution. Following separation of the aqueous phase and removal by distillation of the chloroform, there remains a highly reactive pitch fraction which can be converted into high-anisotropic carbon at low temperatures and in short coking times.

Abstract: A method is provided for effectively tailoring the catalytic activity of synthetic crystalline zeolites. The method involves synthesizing the zeolite from a reaction mixture containing a source of bulky organic cations, contacting the synthesized zeolite with hydrogen fluoride solution, calcining the hydrogen fluoride solution contacted zeolite, contacting the calcined zeolite with an ammonium exchange solution, and then calcining the ammonium exchange solution contacted zeolite.

Abstract: A process for the preparation of calcium fluoride from industrial waste waters which comprises treatment of the waste waters with potassium hydroxide, followed by lime precipitation, neutralization with carbon dioxide and filtration to provide the calcium fluoride product.

Abstract: Metallic phosphates are prepared by heating mixtures of BPO.sub.4 and a metallic oxide or salt.

Abstract: In a pressure swing adsorption system for the purification of hydrogen to be used in an ammonia synthesis gas, nitrogen is employed as a purge gas at an elevated purge pressure. The hydrogen recovered at adsorption pressure contains about 20-25% nitrogen and is advantageous for use as said ammonia synthesis gas. The purge gas is expanded to generate power that can be used to compress air being passed to an air separation system. The nitrogen recovered therein can be employed as said purge gas, while the oxygen recovered can conveniently be employed in a hydrogen generation system used to form said hydrogen passed to the pressure swing adsorption system.