Abstract: A stable liquid fertilizer solution containing nitrogen, phosphorus, iron and optionally sulfur is prepared by mixing a water-soluble iron compound with ammonium polyphosphate and water to produce an iron phosphate slurry having a molar ratio of polyphosphate phosphorus to iron of at least about 2:1, adding ammonia to the iron phosphate slurry to produce a solubilized iron complex; and adding an inorganic acid to the iron complex solution. The amount of acid added is generally that which brings the pH of the fertilizer solution to within the range of about 5.5 to 7.0.

Abstract: A method for preparing aluminum trimetaphosphate comprising various chain form polyphosphate species by heating a mixture of aluminum hydroxide and ammonium phosphate is disclosed.

Abstract: A method for preparing aluminum trimetaphosphate predominately in the B-form by heating a mixture of aluminum hydroxide and ammonium phosphate compound is disclosed.

Abstract: A method for preparing a trimetaphosphate of a trivalent species by heating a mixture of ammonium phosphate and an oxygen-containing compound of the trivalent species is disclosed.

Abstract: The process of this invention provides for reducing the tendency of a carbon monoxide gas stream, containing a minor level of elemental phosphorus, to corrode metallic surfaces in a combustion zone upon combustion of the gas stream in the combustion zone to combustion gases. The process comprises, prior to combustion:(a) cooling the gas stream to a sufficiently low temperature to condense a quantity of elemental phosphorus to produce a reduced level of elemental phsophorus in the gas stream; and(b) diluting the gas stream with an effective amount of combustible gas, wherein the effective amount of combustible gas is an amount which is effective in producing a dew point of the combustion gases, with respect to the quantity of acid, e.g. meta-phsophoric acid (HPO.sub.3), produced by the combustion of the reduced level of elemental phosphorus, less than the temperature of the metallic surfaces.

Abstract: The process of this invention provides for reducing the tendency of a carbon monoxide gas stream, containing a minor level of elemental phosphorus, to corrode metallic surfaces in a combustion zone upon combustion of the gas stream in the combustion zone. The process comprises:(a) prior to combustion, cooling the gas stream to a sufficiently low temperature to condense a quantity of elemental phosphorus to produce a reduced level of elemental phosphorus in the gas stream; and(b) injecting into the combustion zone during combustion an effective amount of MgO or a compound capable of yielding MgO to neutralize the quantity of acid, e.g. meta-phosphoric acid (HPO.sub.3), produced by the combustion of the reduced level of elemental phosphorus.

Abstract: A method for the preparation of a single phase crystalline vanadium(IV)bis(metaphosphate), VO(PO.sub.3).sub.2, catalyst having an improved intrinsic surface area of from about 5 to 15 m.sup.2 /g. and useful for the vapor phase oxidation of linear C.sub.4 unsaturated olefins, such as n-butenes, to prepare maleic anhydride.

Abstract: A fertilizer rich in calcium metaphosphate is produced by reacting phosphorite or other calcium phosphate-bearing mineral, with ammonium bisulphate to produce a precipitate of calcium sulphate and an aqueous solution rich in ammonium mono- and biphosphates. The latter is then heated in a furnace in the presence of further calcium phosphate-bearing mineral, to produce calcium metaphosphate. The calcium sulphate can be converted to calcium carbonate by reaction with ammonium carbonate, to produce ammonium sulphate. The ammonium sulphate can be heated with the furnace gases from the production of calcium metaphosphate, to produce the required ammonium bisulphate for reaction with phosphorite and the required ammonium carbonate for a conversion of the calcium sulphate to calcium carbonate.

Abstract: A method is disclosed for making the .beta.-form of aluminum trimetaphosphate by reacting aluminum dihydrogen phosphate with ammonia and subjecting the reaction product to a single elevated temperature treatment.

Abstract: A method for the preparation of a single phase vanadium(IV)bis(metaphosphate), VO(PO.sub.3).sub.2, catalyst having an improved surface area and useful for the vapor phase oxidation of linear C.sub.4 unsaturated olefins, such as the n-butenes, to prepare maleic anhydride.

Abstract: Pure Maddrell salt is produced by heating sodium phosphate to temperatures of 250.degree. to 420.degree. C. The sodium phospate used as starting material is sodium trimetaphosphate or a mixture of sodium trimetaphosphate with Maddrell salt, monosodium orthophosphate or disodium pyrophosphate, the mixture containing Na and P in a molar ratio of 1:1. Prior to heating the starting material, it is admixed with 0.5 to 5 weight% of orthophosphoric acid, polyphosphoric acid, phosphorus pentoxide or at least one salt of a volatile base forming polyphosphoric acid at the temperatures specified. The resulting mixture is calcined over the period necessary to transform the starting material to Maddrell salt.

Abstract: Process for preparing dicalcium phosphate dihydrate with displacement 0.1 - 5% of the calcium by divalent metal ion.

Abstract: Polymeric metaphosphate glasses, [M(PO.sub.3).sub.b ].sub.n, having chemical durabilities at least 40-400 times greater than those of the prior art are provided. In the formula, M is selected from the group consisting of Al, Be, Mg, Ca, Sr, Ba, Cd and Zn, and "b" has a value of 3 for Al and 2 for the other cations. The high durabilities of the glasses are achieved by controlled preparation of the precursor compounds in specific stoichiometric proportion, by heating the precursors in a controlled thermal cycle to induce preliminary polymerization of the intermediates, by thereafter melting said intermediates, and by subsequently holding said melt for a time to complete the polymerization. The melt is then cast to form the glass which is then annealed in the normal manner.The disclosure involves in particular single high purity compound precursors which form single phase glasses.

Abstract: Aluminum phosphate is made in ultrapure form by reaction between phosphoric acid and an aluminum alkoxide. Cast articles may be made by using the liquid reaction intermediate product as a binder in sintering of particles of aluminum phospate.

Abstract: An advantageous process of producing Maddrell salt which is substantially free of water-soluble by-products is described. The resulting substantially water-insoluble Maddrell salt is especially useful as polishing and cleaning agent in toothpaste.

Abstract: A solid source consisting essentially of high purity aluminum metaphosphate, Al(PO.sub.3).sub.3 is used for introducing elemental phosphorus into P-type silicon chips or wafers of semi-conductor grade. The aluminum metaphosphate functions as a source for the controlled release of P.sub.2 O.sub.5 vapors which are directed to the desired face of the silicon wafer. The reverse side of the silicon wafer receives little or no phosphorus and consequently retains its character as P-type silicon.