Patents in Class 423/317

Matches 1 - 50 out of 102

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Match	Document	Document Title
1	7517514	Process for treating residue of organic material A process for treating organic material, separating calcium and recovering phosphorus and to utilization of the obtained products and their use as a soil conditioner and a fertilizer as well as for...
2	7470414	High purity phosphoric acid and process of producing the same High purity phosphoric acid having an Sb content of 200 ppb or less and a sulfide ion content of 200 ppb or less as impurity contents on a 85 weight percent H 3 PO 4 basis. The high purity...
3	7378070	Phosphorous pentoxide producing methods A phosphorous pentoxide producing method includes forming a kiln bed using feed agglomerates with a calcium-to-silica mole ratio of less than 1.0 and maintaining a bed temperature at or above...
4	7083768	Processes for purifying phosphoric acid and for preparing phosphoric acid A process for purifying phosphoric acid includes removing volatile components from phosphoric acid rich in impurities to form a crude phosphoric acid liquid substantially free of volatile...
5	7070747	Process of eluting and recovering phosphorus from sludge In a process of eluting phosphorus from sludge into a liquid phase and recovering the phosphorus efficiently, cell walls of microorganisms in the sludge are ruptured by a process selected from...
6	6921520	Process for upgrading raw phosphate ore The present invention is a process for upgrading feedstock prepared from raw phosphate ore. Phosphorus sludge is burned to produce impure phosphoric acid and the acid is combined with beneficiated...
7	6861039	Method for purification of phosphoric acid high purity polyphosphoric acid The present invention provides a purification method of phosphoric acid, which includes bringing phosphoric acid containing arsenic into contact with hydrogen halide, thereby to remove the arsenic...
8	6814949	Process for production of phosphoric acid by crystallization of phosphoric acid hemihydrate The invention relates to a process for producing simultaneously food-grade and fodder-grade phosphoric acid by crystallizing phosphoric acid hemihydrate, H 3 PO 4 ×0.5H 2 O, from a prepurified...
9	6540969	Preparation of hexafluorophosphoric acid The present invention provides a process for preparing hexafluorophosphoric acid complexed with about 1 to 3.3 molecules of water which are stable at temperatures below 20° C. and the compositions...
10	6153552	Methods for making catalysts Catalysts that are useful for hydrocarbon conversions and oxygenate conversions, and a method for making such catalysts. The method for making the catalysts comprises forming a mixture comprising...
11	6002065	Kits for preparing calcium phosphate minerals Setting times of calcium phosphate cement compositions are enhanced by the addition of phosphate or carbonate lubricant compositions. Methods for preparing the cement compositions are provided.
12	5820632	Prepared calcium phosphate composition and method Setting times of calcium phosphate cement compositions are enhanced by the addition of phosphate or carbonate lubricant compositions. Methods for preparing the cement compositions are provided.
13	5580623	Storage stable partially neutralized acid compositions and uses Methods and compositions are provided for preparing storage stable partially neutralized acid compositions. The partially neutralized acid compositions are amenable to prolonged periods of storage....
14	5368832	Zero discharge process for manufacturing of phosphorous acid and hypophosphorous acid Disclosed is a method of making phosphorous acid or hypophosphorous acid by reacting hydrogen chloride with a sodium phosphite or a sodium hypophosphite, respectively, in the presence of water to...
15	5368741	Treatment of aqueous phosphorus wastes Aqueous phosphorus wastes from the electric furnace production of phosphors and containing heavy metal bearing particulates are treated with lime whereby the phosphorus is converted into useful...
16	5336264	Situ prepared calcium phosphate composition and method Setting times of calcium phosphate cement compositions are enhanced by the addition of phosphate or carbonate lubricant compositions. Methods for preparing the cement compositions are provided.
17	5275639	Recovery of phosphates from elemental phosphorus bearing wastes A process for oxidizing aqueous elemental phosphorus containing residues (sludges) to produce orthophosphate containing slurries suitable for subsequent reaction with ammonia to produce nitrogen-...
18	5208000	Hydrolysis of phosphorus trichloride There is disclosed a process for the controlled hydrolysis of phosphorus trichloride which avoids the formation of lower oxides of phosphorus, phophines and diphosphines wherein phosphorus...
19	4980142	Preparation of phosphorous acid Phosphorous acid is formed by gaseous phase oxidation of phosphorus with water vapour to form predominantly P 2 O 3 and dissolving the P 2 O 3 so-formed in water. The P 2 O 3 also can be...
20	4932993	Batch production of suspension fertilizers using lignosulfonate In the production of suspension fertilizers the addition of an additive comprising lignosulfonate to the wet-process acid prior to the ammoniation step prevents severe thickening of the suspension...
21	4919906	Processes and equipment for production of elemental phosphorus and thermal phosphoric acid New processes and equipment are disclosed for producing elemental phosphorus and thermal phosphoric acid. Benefits are listed below. 1. Phosphorus-containing solids are recycled to smelting...
22	4874593	Conversion of pyrophoric P.sub.4 -containing material to P.sub.2 O.sub.5 material A process for treating a pyrophoric P 4 -containing material to convert it to a substantially non-pyrophoric P 2 O 5 material is described. The process comprises supplying streams of fluid P 4 ...
23	4834960	Process for purifying phosphorous acid The purification of phosphorous acid which is formed in halogenations of hydrocarbon derivatives using phosphorus trihalides is carried out in the context of preparing phosphorous acid in a...
24	4780294	Process for making crude phosphoric acid Crude phosphoric acid is made by subjecting crude phosphate ore containing sulfide to processing treatment with a mineral acid in a closed system comprised of a processing reactor, a filtering zone...
25	4713228	Heat recovery in the manufacture of phosphorus acids Heat is recovered from the phosphorus combustion chamber of a furnace phosphoric acid plant by placing in the combustion chamber a heat exchange surface having a protective meta acid coating...
26	4698216	Production of an aqueous phosphoric acid solution Aqueous phorphoric acid solutions are produced by contacting an elemental phosphorus-containing material with an oxygen-containing gas, while both are finely divided and well mixed together in a...
27	4692323	Process for separation of magnesium-based, and possibly fluorine-and aluminum-based impurities from a wet-produced phosphoric acid The invention concerns a process for separating magnesium-based impurities contained in a wet-process produced phosphoric acid. This process comprises adding an ammonium compound R(NH 4 ) soluble...
28	4686094	Treatment of pyrophoric elemental phosphorus-containing material Pyrophoric elemental phosphorus-containing material, e.g., solid waste containing high levels of elemental phosphorus (P 4 ), is treated by contact with an oxygen-containing gas, such as air, to...
29	4684512	Phosphate recovery from wet phosphoric acid purification process The invention is a process for recovering phosphorus value from magnesium pyrophosphate containing filter media in the wet superphosphoric acid purification process. The invention comprises...
30	4639359	Process of removing cationic impurities from wet process phosphoric acid A method of removing aluminum, magnesium, iron and other impurities from wet process phosphoric acid is provided. The method comprises partially ammoniating the acid and reacting the acid with a...
31	4637921	Process for producing ammonium polyphosphate An improved process of concentrating wet process phosphoric acid by continuously contacting an acid feed containing at least about 56 weight percent of P 2 O 5 based on the total weight of the...
32	4632814	Process for stabilizing phosphoric acid An improved process for stabilizing wet process phosphoric acid is described in which the acid is treated with pressurized carbon dioxide and then is aged so as to enhance the rate of...
33	4619819	Phosphoric acid composition Processes and compositions of matter are disclosed for the production of liquid fertilizers wherein wastewater from a phosphorus smelting furnace is incorporated in liquid fertilizer processes. The...
34	4603039	Process for making phosphorus pentoxide and optionally phosphoric acid with utilization of the reaction heat The disclosure relates to a process for making phosphorus pentoxide by subjecting elemental yellow phosphorus to combustion with dried air inside a steel-made combustion chamber with utilization of...
35	4554144	Removal of magnesium and/or aluminum values from impure aqueous phosphoric acid Magnesium and aluminum impurities are removed from aqueous phosphoric acid by treatment with a fluorine material and an alkali metal containing material in such a manner that the atomic ratio of...
36	4551319	Two-stage concentration for superphosphoric acid A process for the concentration of phosphoric acid by evaporation under vacuum in two stages to produce superphosphoric acid, the pressure inside the exchanger is kept equal to or greater than 0.35...
37	4521392	Process for blending phosphoric acids of differing impurity content Phosphoric acids of significantly different content of soluble impurities, especially magnesium compounds, can be blended to produce a phosphoric acid with a decreased tendency for forming...
38	4500502	Process for removing impurities from wet process of phosphoric acid A method of preparing a purified ammoniated phosphoric acid composition, comprising, reacting an aqueous wet process phosphoric acid with an ammonium ion source at a N/P 2 O 5 weight ratio...
39	4495165	Method of purification of phosphoric acid Appreciable inorganic impurities and organic matter are removed from impure phosphoric acid, particularly wet-process phosphoric acid, by pyrolysis of a mixture containing the raw acid and porous...
40	4487750	Stabilization of wet process phosphoric acid An improved method for producing wet process phosphoric acid with low post-precipitation characteristics from an unclarified dilute wet process phosphoric feed acid is described. The feed acid is...
41	4483838	Treatment of contaminated phosphoric acid to recover usable acid therefrom Phosphoric acid containing organic contaminants, such as phosphoric acid recovered from a thiophenol process, is treated to recover usable acid by conducting a hot separation of the contaminated...
42	4442081	Process for producing a stabilized phosphoric acid A wet process phosphoric acid which has been treated with aluminosilicate after the first stage of clarification can be further stabilized against precipitation of solids during storage and...
43	4439407	Method for improving filterability of gypsum and wet process phosphoric acid A process for the improved filterability of wet process phosphoric acid which comprises maintaining the ratio of ferric ion to ferrous ion in the wet process phosphoric acid above about 1.0 when...
44	4418019	Process for the manufacture of 1-aminoalkane-1,1-diphosphonic acids The invention relates to a process for making 1-aminoalkane-1,1-diphosphonic acids of the general formula (I): ##STR1## in which R stands for an aliphatic hydrocarbon radical having from 1 to 12...
45	4394360	Process for reducing iron in phosphoric acid solution Iron contained in phosphoric acid solution is reduced from the trivalent to the bivalent oxidation stage. To this end, red phosphorus is used as the reductant and the reduction is effected in the...
46	4377559	New method of disposing of the residue from the production of diaklyl phosphorochloridothionate The invention is a method of treating the distillation residue from the production of phosphorochloridothionates which comprises draining the residue into agitated cold water to form a slurry and...
47	4364911	Method for treating the residue from the production of phosphorochloridothionates The invention pertains to a method of treating the distillation residue from the production of phosphorochloridothionates on a continuous or semi-continuous basis. The method comprises, agitating...
48	4355010	Process for removing phosphorus in vapor form and phosphanes from gas mixtures Phosphorus in vapor form and phosphanes are separated from gas mixtures which consist of carbon monoxide, with or without hydrogen, nitrogen and steam. Concerned are more particularly the off-gases...
49	4309394	Method of preparing ultraphosphoric acid Ultraphosphoric acid containing a phosphorus to hydrogen ratio of greater than 1 can be prepared by bringing together in a reaction zone elemental phosphorus and a sufficient amount of oxygen in a...
50	4301131	Oxidation of phosphoric acid plus K compound addition This invention is directed to an improvement in the Hill phosphoric acid process, whereby the Hill process can be used with high-iron phosphate rock. The improvement involves oxidation of divalent...

Matches 1 - 50 out of 102

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