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| Number | Title | Issue Date |
| 7361323 | Method for the production of phosphoric acid and/or a salt thereof and products thus obtained A method for the production of phosphoric acid comprising a phosphate ore attack by a first aqueous chlorohydric acid solution, separation in the attack liquor between a solid insoluble phase containing impurities and a separate aqueous phase comprising phosphate io... | 04/22/2008 |
| 7166264 | 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 components; heating the crude phosphoric acid liquid to a temperature above 25... | 01/23/2007 |
| 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 components; heating the crude phosphoric acid liquid to a temperature above 25... | 08/01/2006 |
| 6645453 | Solvent extraction process for recovery of uranium from phosphoric acid (25-55% P205) An improved process of extraction of uranium from phosphoric acid and in particular uranium VI from phosphoric acid especially strong phosphoric acid using a selective synergistic extractant mix of an organo-phosphorous acid and a neutral extraction agent... | 11/11/2003 |
| 6251351 | Wet-process technique for refining phosphoric acid A process for purification by multistage countercurrent extraction of wet-process phosphoric acid includes the steps of (a) preparing an aqueous phosphoric acid by decomposition of crude phosphates with sulfuric acid and prepurification thereof; (b) provi... | 06/26/2001 |
| 5326906 | Process for the extractive removal of phospho- and sulfobetaines from acidic reaction solutions The ampholytes are extracted from the reaction solution with a liquid cation exchanger which is immiscible with the acidic aqueous reaction solution, where the cation exchanger is dissolved in at least one organic solvent which is immiscible with water an... | 07/05/1994 |
| 5047223 | Separation of phosphoric acid from aqueous solutions of thiamine phosphates Phosphoric acid is separated from aqueous solutions of thiamine phosphates which are obtained in the phosphorylation of thiamine, with or without subsequent partial hydrolysis, by a process in which the phosphoric acid is converted with a virtually water-... | 09/10/1991 |
| 5006319 | Process for removing iron, chromium and vanadium from phosphoric acid A process is provided for purifying phosphoric acid, such as wet process phosphoric acid by extracting the impure phosphoric acid with a nonaqueous solvent and contacting the nonaqueous solution of phosphoric acid with a strongly basic anion exchange resi... | 04/09/1991 |
| 4877594 | Purification of phosphoric acid A mixture of hydrophobic and hydrophilic extractants is used to separate phosphate values from impurities found in phosphoric acid. In one approach, impurities are removed from phosphoric acid and the phosphate values are recovered, by introducing polypho... | 10/31/1989 |
| 4806324 | Process for making phosphoric acid free from titanium Phosphoric acid substantially free from titanium is made from the organic extract obtained by subjecting crude phosphoric acid containing titanium to extractive purification with an organic solvent immiscible or only partially miscible with water. To this... | 02/21/1989 |
| 4781905 | Process for producing phosphoric acid and/or phosphates from wet-process phosphoric acid and an extractant therein A process is developed for producing phosphoric acid and phosphates from wet-process phosphoric acid. The crude acid is extracted with a waterimmiscible solvent mixture consisting of mixed trialkyl phosphine oxide and a diluent, wherein about 2/3 P2 | 11/01/1988 |
| 4780295 | Process for purifying phosphoric acid The invention is a process to purify a solution of phosphoric acid by removing transition metal impurities such as iron, chromium and vanadium. In the process a solution of phosphoric acid in an organic solvent which is substantially immiscible with water... | 10/25/1988 |
| 4769226 | Purification of wet-process phosphoric acid Crude wet-process phosphoric acid is purified by treating a dilute such acid with a molybdenum value reducing amount of hydrogen sulfide or of a sulfide which in situ forms hydrogen sulfide, to afford a purified acid adopted for the production of food gra... | 09/06/1988 |
| 4762693 | Process for working up heavy metal-containing residues originally from the decontamination of crude phosphoric acid Residue obtained upon the removal of heavy metal contaminants from crude phosphoric acid by means of a dialkyldithiophosphoric acid ester and adsorbent is worked up into ecologically reliable solid matter and into a heavy metal concentrate. The solid matt... | 08/09/1988 |
| 4762692 | Process for the precipitation and separation of cadmium sulphide from the raffinates derived from phosphoric acid purification Disclosed is a process for the precipitation and separation of cadmium sulphide from the raffinates derived from phosphoric acid purification by treating the cadmium containing streams of the raffinates with a H2 S containing solvent phase in a... | 08/09/1988 |
| 4751066 | Process for preparing alkali metal phosphate Alkali metal phosphates are recovered from a water immiscible solvent solution of aqueous wet process phosphoric acid by neutralizing the acid with a basic alkali metal salt in a ratio of alkali metal to phosphorus of 1 to 3.5 to form at least the mono al... | 06/14/1988 |
| 4714600 | Process for production of phosphoric acid from dry matrix by SO3 treatment and extraction Phosphoric acid is produced from dry phosphate ore, matrix by acidulation with sulfur trioxide in the presence of sulfuric acid catalyst to form polyphosphoric acid, treatment with sufficient water to convert the polyphosphoric acid to orthophosphoric aci... | 12/22/1987 |
| 4713229 | Process for purifying phosphoric acid Wet process phosphoric acid is freed from heavy metal ions, especially from ions of cadmium, copper, mercury, lead and arsenic and optionally also from organic compounds and sulfuric acid. To this end, the phosphoric acid is contacted with a diorganyldith... | 12/15/1987 |
| 4676963 | Manufacture of sodium tripolyphosphate from wet acid A process is described for converting wet acid into sodium tripolyphosphate by pretreating the wet acid in a pretreatment stage with a sodium source and SiO2 to precipitate fluoride values from the wet acid, solvent extracting the pretreated we... | 06/30/1987 |
| 4643882 | Process for recovery by a solvent of the uranium present in phosphoric acid A process for the recovery of the uranium present in phosphoric acid produced by a wet process in (A) by means of a suitable solvent (L9), which is carried out after separation of the gypsum in (B) formed in the attack operation, and eliminatio... | 02/17/1987 |
| 4643883 | Method of decolorizing wet process phosphoric acid A method of decolorizing wet process phosphoric acid containing organic color-imparting impurities is provided. The process includes treating the acid with a strong oxidant at a temperature in the range of about 50° to about 150° C. by slowly adding the... | 02/17/1987 |
| 4640824 | Process for making alkali metal phosphate solutions containing little fluorine The disclosure relates to a process for making alkali metal phosphate solutions containing little fluorine from pre-purified alkali metal phosphate solutions obtained from crude phosphoric acid by extracting the acid with an organic solvent being immiscib... | 02/03/1987 |
| 4634580 | Process for the purification of wet-process phosphoric acid by removal of cadmium A process for the removal of cadmium contained in wet-process phosphoric acid by flotation by means of a cadmium-collector anionic surface active agent and an injected gas in the presence of other impurities including iron and possibly uranium which is ch... | 01/06/1987 |
| 4629614 | Process for decontaminating phosphoric acid Wet-process phosphoric acid prepurified by liquid/liquid extraction with an organic solvent is decontaminated. To this end, the prepurified acid is first freed from residual extractant, then stripped with steam or hot gas, contacted with a dialkyldithioph... | 12/16/1986 |
| 4596703 | Process for purifying wet-processed phosphoric acid The disclosure relates to a process for purifying crude, concentrated wet-processed phosphoric acid. To this end, the disclosure provides: (a) for the organic solvent to be mixed with the starting product in a ratio by volume of more than 4:1 to effect the ext... | 06/24/1986 |
| 4585636 | Process for the manufacture of purified phosphoric acid The present invention relates to an improved process for the manufacture of purified phosphoric acid from phosphate rock. According to the invention, phosphate rock is decomposed by a mineral acid selected from hydrochloric acid, sulfuric acid or mixtures... | 04/29/1986 |
| 4556548 | Process for purifying wet-processed phosphoric acid The disclosure relates to a process for purifying crude, concentrated wet-processed phosphoric acid. To this end, the disclosure provides: (a) for the organic solvent to be mixed with the starting product in a ratio by volume of more than 4:1 to effect in a si... | 12/03/1985 |
| 4543239 | Phosphoric acid extraction process A method for extracting phosphoric acid from wet process phosphoric acid is disclosed. N,N-dialkyl--aminoacids are contacted with wet process phosphoric acid to extract substantially pure phosphoric acid therefrom. The N,N-dialkyl--aminoacid... | 09/24/1985 |
| 4540557 | Process for reducing the fluorine content in wet-processed phosphoric acid The disclosure relates to a process for reducing the fluorine content in wet-processed phosphoric acid. To this end, the disclosure provides for an acid extract in an organic solvent to be treated with an at least 45 weight % suspension of aluminum hydrox... | 09/10/1985 |
| 4536378 | Phosphate fertilizer production Processes for the preparation of phosphoric acid, such as merchant phosphoric acid, and for the provision of phosphoric acid suitable for the preparation of ammonium phosphates, are disclosed. Such processes comprise providing a source stream of phosphori... | 08/20/1985 |
| 4514365 | Process for recovering a uranium-containing concentrate and purified phosphoric acid from a wet process phosphoric acid containing uranium A process for recovering from a wet process phosphoric acid which contains uranium, a uranium containing concentrate and a purified phosphoric acid. The wet process phosphoric acid is treated with a precipitant in the presence of a reducing agent and an a... | 04/30/1985 |
| 4511541 | Process for the recovery of cadmium and other metals from solution A process for the selective recovery of cadmium, molybdenum, zinc, nickel and other metal values from wet process phosphoric acid and other acidic to slightly basic carrier solutions, wherein the metal-bearing solution is contacted with an organophosphene... | 04/16/1985 |
| 4503016 | Process for extracting heavy metal ions from aqueous solutions The disclosure relates to a process for liquid/liquid-extraction of heavy metal ions from acid aqueous solutions with the aid of water-insoluble dithiophosphoric acid diesters as extracting agents. More particularly, use is made of phosphoric acid solutio... | 03/05/1985 |
| 4493820 | Process for partial removing of impurities from a wet process phosphoric acid A process for the partial removal of impurities present in a wet process phosphoric acid used in the production of granulated mono- or di-ammonium phosphate fertilizers in order to control the grade of the final product. All or a portion of the liquid fro... | 01/15/1985 |
| 4492680 | Removal of cadmium from acidic phosphatic solutions The invention is concerned with a process of removing cadmium from acid, especially P2 O5 -containing solutions by liquid/liquid extraction with the aid of alkyl amine salts that are dissolved in an inert, organic solvent. The cadmiu... | 01/08/1985 |
| 4490336 | Process for stripping uranium from an alkyl pyrophosphoric acid A process is described for the recovery of tetravalent uranium from wet-process phosphoric acid utilizing an alkyl pyrophosphoric acid extractant or the like. After extracting the tetravalent uranium from wet-process acid, iron is stripped from the pregna... | 12/25/1984 |
| 4479924 | Process for the separation of heavy metal compounds from phosphoric acid A process for the separation of heavy metal components, especially of compounds of cadmium, mercury and lead, from crude phosphoric acid obtained according to the Odda process, which comprises adjusting this crude phosphoric acid with ammonia to a pH of f... | 10/30/1984 |
| 4466948 | Process for removing heavy metal ions and arsenic from wet-processed phosphoric acid The disclosure relates to a process for removing heavy metal ions and arsenic from wet-processed phosphoric acid, wherein the crude wet-processed phosphoric acid is treated at temperatures between 10° and 100° C. initially with a diorganyldithiosphospho... | 08/21/1984 |
| 4457899 | Process for removal of residual organic matter from purified phosphoric acid This invention provides a process for removal of residual organic matter from wet process phosphoric acid purified by solvent extraction with a volatile solvent that comprises contacting said purified phosphoric acid with hydrogen peroxide at a temperatur... | 07/03/1984 |
| 4457848 | Process for after-treating extraction residues originating from the decontamination of phosphoric acid The disclosure relates to a process for after-treating extraction residues, termed raffinates, originating from the extractive decontamination of crude phosphoric acid. To this end, the disclosure provides for the raffinates to be converted to two separat... | 07/03/1984 |
