Abstract: The present invention concerns an improvement in the electric furnace process for making elemental phosphorus. The invention features the deliberate addition of an alkali to the burden or charge that is fed to the furnace. Several advantages are gained by the addition of an alkali: pollution is reduced by scavenging fluorine compounds, operating efficiencies are gained, and control over the process is simplified.

Abstract: Titanium-containing molecular sieves are disclosed having use as molecular sieves and as catalyst compositions in hydrocarbon conversion and other processes the instant invention employs novel titanium-containing molecular sieves comprising titanium, aluminum, phosphorus and oxygen and are generally employable in separation and hydrocarbon conversion processes.

Abstract: Method for producing alkali metal selenite and alkali metal selenate from metallic selenium through selenous acid. The selenium is dissolved in nitric acid to form silenous acid, which is reacted with an alkali metal base to from alkali metal selenite. The formed selenite is then spray dried. Alternatively, the formed selenite is oxidized at elevated temperature in a basic environment at pH 10-12, with hydrogen peroxide as the oxidant, to form selenate, which is then spray dried. The invention also relates to products produced by the method. The products are intended to be incorporated in animal fodder or foodstuffs (solenite), or in fertilizers (selenate), to be thus administered to human beings and animals as trace substances.

Abstract: A process for the growth of silicon nitride whiskers consists of reacting a mixture of carbon and silicon dioxide powders at elevated temperature in a stream of nitrogen, said reaction mixture containing small amounts of metals such as chromium, magnesium, and nickel which promote the growth of silicon nitride whiskers by vapor phase transport. The whiskers obtained as a result of this invention are of much higher purity than those obtained by prior art.

Abstract: A direct low temperature process for the preparation of pure magnesium borohydride diammoniate or the deuterated analog thereof based on the addition of 90-95% of the stoichiometric amount of NH.sub.3 to an excess of Mg(BH.sub.4).sub.2.X(C.sub.2 H.sub.5).sub.2 O in a benzene reaction solvent in accordance with equation 1: ##STR1## wherein X is a numeral from about 2.0 to about 2.5; or when the reaction is conducted in an ether reaction solvent with the same quantities of reactants and under the same experimental conditions, the triammoniate or the deuterated analog thereof is formed in accordance with equation 2: ##STR2## wherein X is a numeral from about 2.0 to about 2.5. In either case the pure product is readily isolated by filtration, solvent washing to remove excess Mg(BH.sub.4).sub.2.X(C.sub.2 H.sub.5).sub.2 O, and vacuum drying at ambient temperature. Yields are 95-99%; purities are typically about 97%.

Abstract: Disclosed is potassium perborate-hydrate of the formula KBO.sub.3.nH.sub.2 O where n is 0 to 1 and a process for its preparation by the reaction of H.sub.2 O.sub.2 with potassium metaborate in the presence of an excess of potassium ions.

Abstract: In a process for the conversion of meta-kaolin into an aqueous alkaline suspension of low-grit, water-containing zeolitic sodium aluminosilicate of the smallest particle size having the molar composition:0.9 to 1.1 Na.sub.2 O: 1 Al.sub.2 O.sub.3 : 1.8 to 2.3 SiO.sub.2with a water content depending on the degree of drying, which contains at least 99.8% by weight of a particle size of less than 25.mu. and has a high cation exchange capability, the improvement consisting of:slowly heating a suspension of reactants to a zeolitization temperature in the range of from 70.degree. to 100.degree. C., with a temperature rise averaging 20.degree. C.

Abstract: A method of manufacturing silicon carbide crystals in which a rice husk raw material is pretreated with an acid solution (e.g., 5N to 6N H.sub.2 SO.sub.4, HCl or HNO.sub.3) prior to being heated in a furnace of non-oxidizing atmosphere. Pretreatment of the rice husks in this manner results in silicon carbide crystals of high purity.

Abstract: A cobalt carbonate slurry and method for making same is described. The method comprises steps of reacting a water-soluble cobalt (II) salt with a water-soluble carbonate in aqueous solution in an inert atmosphere to form the desired cobalt carbonate and a water-soluble salt as a by-product; filtering the resultant cobalt carbonate; washing the resultant wet filter cake and preparing an aqueous slurry of cobalt carbonate from the wet filter cake. Preferably, the slurry is made to a pumpable viscosity. Additives may be used for specific applications to retard settling. Slurries prepared from the wet filter cake are superior to those prepared from the dry powder form because they are more uniform and stable for longer periods of time and resuspend more readily.

Abstract: Irradiation of a siloxane derives SiO at low temperatures and forms the basis for a closed cycle reforming the siloxane that decomposes water to produce H.sub.2 and O.sub.

Abstract: A method is disclosed for making molecular sieving high silica mordenite comprising the steps of:(A) providing a mixture comprising: water; an oxide of silicon source; an oxide of aluminum source; a mineralizing agent; and a synthesis directing nitrogen containing organic dye; and(B) maintaining said mixture at a temperature of about 80.degree. C. to about 300.degree. C. for an effective period of time to provide said mordenite.

Abstract: A process for producing a thermally shock calcined crystalline silica comprising (A) precalcining a crystalline silica at a relatively low temperature, (B) very rapidly increasing the temperature of the crystalline silica to a relatively high temperature for a short period of time, and (C) rapidly cooling the crystalline silica. The resulting crystalline silica is catalytically active for hydrocarbon conversion reactions and is particularly selective for the production of para-xylene from a reaction mix of toluene and a methylating agent.

Abstract: A process for the production of aluminum trihydroxide having controlled median diameter of 2 to 100 microns, with a unimodal distribution and minimum deviation, by decomposing a hot supersaturated sodium aluminate solution in the presence of seed aluminum trihydroxide, separating the resultant solid and liquid phases and recovering the solid phase constituted by precipitated aluminum trihydroxide. The process comprises grinding aluminum trihydroxide until the aluminum trihydroxide has a specific BET surface area of at least 1 m.sup.2 /g, introducing the ground aluminum trihydroxide into a hot fraction of the supersaturated sodium aluminate solution to precipitate trihydroxide seed and then decomposing the remaining fraction of the supersaturated sodium alimuniate solution in the presence of the seed. This decomposition leads to the precipitation of aluminum trihydroxide having the required median diameter.

Abstract: A process for producing a thermally shock calcined aluminosilicate zeolite comprising (A) precalcining an aluminosilicate zeolite at a relatively low temperature, (B) very rapidly increasing the temperature of the aluminosilicate zeolite to a relatively high temperature for a short period of time, and (C) rapidly cooling the aluminosilicate zeolite. The resulting zeolite is catalytically active for hydrocarbon conversion reactions and is particularly selective for the production of para-xylene from a reaction mix of toluene and a methylating agent.

Abstract: A crystalline aluminosilicate zeolite is obtained by stirring under heating an aqueous reaction mixture containing a silica source, an alumina source, an alkali source and an organic carboxylic acid.

Abstract: Crystalline sodium silicates having a sheet structure and an ion exchange capacity of 83-130 mmol of Na.sup.+ /mol of SiO.sub.2 are prepared by a method in which an aqueous reaction mixture which contains sodium silicate, has a molar ratio SiO.sub.2 /Na.sub.2 O of 3.9:1 to 15:1 and a molar ratio H.sub.2 O/(Na.sub.2 O+SiO.sub.2) of 3:1 to 80:1 and contains 0.01 to 30% by weight, relative to the amount of SiO.sub.2 in the reaction mixture employed, of seed crystals of the desired crystalline sodium silicate is prepared, the mixture is heated to temperatures of 160.degree. to 250.degree. C., the reaction is carried out at least until, in the X-ray diffraction pattern of a sample filtered off under suction and dried at 120.degree. C., the ratio of the intensity of the reflection at the interplanar spacing d.sub.1 =(20.+-.2).multidot.10.sup.-8 cm to the intensity of any reflection present at the interplanar spacing d.sub.2 =(15.5.+-.1.5).multidot.10.sup.

Abstract: The invention relates to a process for the preparation of high purity alpha mercuric iodide for use as a starting material source for the growth of monocrystals usable for nuclear detection.This process consists of synthesizing alpha mercuric iodide and subjecting the thus obtained alpha mercuric iodide to a purification treatment consisting of at least one vacuum distillation stage at a temperature of at least 255.degree. C.For this distillation stage, use is made of a reactor having three zones kept at different temperatures. The iodide to be purified is introduced into the first zone kept at at least 255.degree. C. The mercuric iodide vapors pass through the second zone kept at a higher temperature before being condensed in the air-cooled third zone.

Abstract: A process for the preparation of a crystalline sheet-type alkali metal silicate in an aqueous medium is described, in which an acidic compound is added to an amorphous alkali metal silicate, or an alkali metal silicate dissolved in water, having a molar ratio M.sub.2 O/SiO.sub.2 (M=alkali metal) of 0.24 to 2.0, in an amount such that a molar ratio M.sub.2 O (unneutralized)/SiO.sub.2 of 0.05 to 0.239 is obtained. If required, the molar ratio SiO.sub.2 /H.sub.2 O is adjusted from 1:5 to 1:100 by dilution, and the reaction mixture is kept at a reaction temperature of 70.degree. to 250.degree. C. until the sheet-type alkali metal silicate has crystallized out.

Abstract: A process for determining the composition of an aqueous solution of ammonia and carbon dioxide from which ammonium carbamate or ammonium carbonate crystallizes out upon cooling to below the saturation temperature. The density and the saturation temperature of the solution are measured, and the ammonia, carbon dioxide, and water composition is determined by reference to densities and saturation temperatures of aqueous solutions of ammonia and carbon dioxide of known composition. The composition thus determined can be used to effect control over the composition of such aqueous solutions.

Abstract: Boron, in suitable compound form in an aqueous composition, is applied to a crop area, the composition having been prepared by diluting a storage-stable concentrate formed by making a solution of the boron compound, and dispersing fine particles of the same or any different such boron compound in the solution, such that the concentration of boron in the concentrate is greater than in a saturated solution.