Class / Patent application number | Description | Number of patent applications / Date published |
423316000 | Ternary compound containing hydrogen | 20 |
20110076218 | Process and Reagents for the Inhibition or Reduction of Scale Formation During Phosphoric Acid Production - Processes and reagents for inhibiting or eliminating scale formation during wet-process phosphoric acid production are provided and include adding to a wet-process phosphoric acid production stream a scale inhibiting amount of a reagent having an aliphatic or aromatic compound containing at least two hydroxy groups, and at least one amine. | 03-31-2011 |
20110076219 | PREVENTING OR REDUCING SCALE IN WET-PROCESS PHOSPHORIC ACID PRODUCTION - Methods for preventing or reducing the formation of scale in a wet-process phosphoric acid production process by intermixing a water-soluble functional organic reagent with a phosphoric acid at one or more step of the phosphoric acid production process in an amount sufficient to prevent or reduce at least one species of scale are provided. | 03-31-2011 |
20110085959 | METHOD FOR THE MANUFACTURE OF CONCENTRATED PHOSPHORUS ACID - A method for the manufacture of concentrated phosphorous acid starting from pure P | 04-14-2011 |
20140120020 | DIHYDRATE-HEMIHYDRATE PROCESS FOR PRODUCING PHOSPHORIC ACID - A method for producing phosphoric acid, comprising attack in an aqueous medium of phosphated rock with sulfuric acid, with formation of a first dihydrate slurry suspended in an aqueous phase having a free P | 05-01-2014 |
423317000 | Orthophosphoric acid | 16 |
20080226529 | PURIFICATION OF PHOSPHORIC ACID RICH STREAMS - The invention relates to a method for the purification or recovery of orthophosphoric acid rich streams by suspension-based melt crystallization. The orthophosphoric acid is crystallized as the hemi-hydrate form and subsequent separation of such crystals in a wash-column produce a high purity acid/water solution that has been depleted of most of the metals and impurities other than water, thereby separating an orthophosphoric acid rich feed liquor into an ultra-pure orthophosphoric acid hemi-hydrate and a mother liquor containing almost all impurities originally present in the feed. The orthophosphoric acid rich feed liquor typically contains no more than 15 wt % water and 1 wt % other impurities. Individual metal ion composition in the purified orthophosphoric acid product is in the range of 100 to 1000 ppb (parts per billion= 1/1000 ppm) of each metal ion. The metal ion composition of the resulting purified product is thus typically below the detection limit of typical analysis equipment. | 09-18-2008 |
20120009112 | METHOD FOR PREPARING HIGH-PURITY ELEMENTAL PHOSPHORUS AND METHOD FOR PREPARING HIGH-PURITY PHOSPHORIC ACID - Provided is a method for preparing high-purity elemental phosphorus capable of simultaneously reducing both arsenic and antimony from crude white phosphorus containing a great amount of arsenic and antimony as impurities. | 01-12-2012 |
20120171099 | PHOSPHORIC ACID PRODUCTION GYPSUM FILTRATION FLOCCULANT PRE-DILUTION (MAKE DOWN) WITH POST-FILTRATION PHOSPHORIC ACID - A method for minimizing the addition of water to a phosphoric acid production process is described. The method uses phosphoric acid to make down a flocculant that is added to the process in order to promote filtration or clarification of crude phosphoric acid. Preferably, the phosphoric acid is a crude, clarified phosphoric acid that is recycled from the phosphoric acid production process itself. | 07-05-2012 |
423318000 | Utilizing reactant containing silicon or carbon | 5 |
20090297424 | Continuous method and apparatus of functionalizing carbon nanotube - The present invention relates to a continuous method for functionalizing a carbon nanotube, and more specifically, to a continuous method for functionalizing a carbon nanotube by feeding functional compounds having one or more functional group into a functionalizing reactor into which a carbon nanotube mixture including oxidizer is fed under a pressure of 50 to 400 atm and a temperature of 100 to 600° C. to a subcritical water or supercritical water condition of a pressure of 50 to 40 atm by using a continuously functionalizing apparatus to obtain the functionalized products, such that the functional group of the functional compound can be easily introduced to the carbon nanotube, thereby increasing the functionalized effect of the carbon nanotube and increasing the dispersibility accordingly. | 12-03-2009 |
20120244058 | PREVENTING OR REDUCING SCALE IN WET-PROCESS PHOSPHORIC ACID PRODUCTION - Methods for preventing or reducing the formation of scale in a wet-process phosphoric acid production process by intermixing a scale inhibiting reagent at one or more step of the phosphoric acid production process in an amount sufficient to prevent or reduce scale are provided. | 09-27-2012 |
20140234196 | RECOVERY OF PHOSPHORUS VALUES AND SALT IMPURITIES FROM AQUEOUS WASTE STREAMS - The present invention generally relates to processes for recovery of phosphorus values and salt impurities from aqueous waste streams. In particular, the present invention relates to processes for recovery of phosphorus values and salt impurities from aqueous waste streams generated in the manufacture of phospho-herbicides, including N-(phosphonomethyl)glycine and glufosinate. | 08-21-2014 |
20160084575 | METHOD OF COMPREHENSIVELY UTILIZING HIGH-TEMPERATURE SLAG BALLS EXITING ROTARY KILN IN KILN PROCESS FOR PRODUCING PHOSPHORIC ACID, AND PROCESS SYSTEM THEREOF - A method and process system of comprehensively utilizing high-temperature slag balls exiting a rotary kiln in a kiln process for producing phosphoric acid, comprising a rotary kiln, a cooling device and a dryer for composite green pellets in a kiln process for producing phosphoric acid, wherein the cooling device comprises at least two cooling stages; the high-temperature slag balls are first conveyed to the cooling device, then the cooling device carries slag balls successively to multiple cooling stages by the movement of a trolley, each cooling stage introduces cold air for cooling, a part of the hot air after cooling is sent to the cavity of the rotary kiln, and the other part thereof is sent to the dryer for composite green pellets in the kiln process for producing phosphoric acid for drying. | 03-24-2016 |
20160152472 | METHOD FOR MASS PRODUCTION OF PHOSPHORIC ACID WITH ROTARY KILN | 06-02-2016 |
423319000 | Reacting an acid and phosphate rock | 4 |
20110200509 | PROCESS FOR THE PRODUCTION OF HIGH PURITY PHOSPHORIC ACID - The invention relates to a process for the production of high purity phosphoric acid which has a very low content in antimony, and is suitable for food, pharmaceutical, or electronic industry. | 08-18-2011 |
423320000 | Sulfuric acid | 3 |
20120039785 | Process for Producing Products Under Very Low Supersaturation - Disclosed is a process for any productions that involve reacting or mixing two or more substances to form one or more new substances under low supersaturation. However, the specific process used to exemplify the present invention is the “wet process” phosphoric acid production, in which this process is achieved through dissolving the phosphate ore and dispersing the sulfuric acid separately and simultaneously with the gypsum slurry that has roughly stoichiometrically balanced calcium and sulfate ions in the solution and is also at considerably low supersaturation. The slurry carried out digesting the phosphate ore and the slurry accomplished dispersing the sulfuric acid then mix together to form the said gypsum slurry that has roughly stoichiometrically balanced calcium and sulfate ions in the solution and is also at considerably low supersaturation. The slurry for filtration is drawn from the sulfuric acid dispersion compartment, and the sulfate level for this slurry is maintained suitable for the product separation. | 02-16-2012 |
20130004403 | METHOD FOR PRODUCING PHOSPHORIC ACID - The invention relates to a method for producing phosphoric acid, including: attacking phosphate rock by means of sulfuric acid between 70° and 90° C. with formation of a first calcium sulfate dihydrate crystal slurry, the aqueous acid phase of said slurry having free P | 01-03-2013 |
20140255287 | PRODUCTION OF PHOSPHORIC ACID BY A TWO-STAGE CRYSTALLIZATION PROCESS - A process and system for producing phosphoric acid. Phosphate rock is dissolved in phosphoric acid in a reaction vessel to form a slurry. The slurry is then reacted in a first stage of crystallization with sulfuric acid to produce calcium sulfate hemihydrate and phosphoric acid. The product acid is separated from the hemihydrates via filtration, and the filter cake is then reacted, in a second crystallization step, with additional sulfuric acid to produce dihydrate calcium sulfate (gypsum) and recovery solution. The gypsum is separated from the recovery solution via filtration and removed as a by-product. The recovery solution is recycled back to the transformation tank and to the hemihydrate filtration step. A feed acid tank combines wash solution, recovery solution and product acid. Once adjusted to a target P | 09-11-2014 |
423321100 | Purification or recovery | 4 |
20120003140 | METHOD FOR IMPROVING GYPSUM/PHOSPHORIC ACID SLURRY FILTRATION USING CARBOXYMETHYL CELLULOSE - A chemical process to improve the filtration performance for the removal of gypsum from phosphoric acid/gypsum slurry using a filtration aid that is selected from a class of polymers, lower molecular weight anionic polyelectrolytes, which previously have not been used for this application. The polymer is CMC or Carboxymethyl Cellulose, which is a polymerized cellulose ether. CMC is found to be extremely effective for phosphoric acid/gypsum slurry that was produced from igneous phosphate rock. CMC is also available in food grade, which is novel for filtration aids for the production of phosphoric acid which may be used for human or animal feed. | 01-05-2012 |
20130287666 | PROCESS FOR THE PURIFICATION OF PHOSPHORIC ACID - Process for purifying a stream comprising phosphoric acid and a first amount of impurities, comprising: forming a slurry of phosphoric acid crystals in a water mother liquor; separating the phosphoric acid crystals from the mother liquor by filtration in a wash column comprising a filtering element, while a packed bed of crystals coming from the slurry forms near such filtering element; washing the separated phosphoric acid crystals in the wash column by bringing a washing liquid in countercurrent to the crystals in the bed up to a wash front, where the washing liquid recrystallizes, the bed being subjected to a movement in the direction of such wash front; forming a purified stream comprising phosphoric acid and a reduced amount of impurities by melting at least part of the washed crystals; and extracting the purified stream from the wash column through a product outlet of the wash column; wherein water is introduced into the wash column, between the wash front and the product outlet and/or in a melting circuit producing at least part of the washing liquid, and wherein the introduction of the said water decreases the equilibrium temperature of the contents of the melting circuit. | 10-31-2013 |
20150360143 | Multi-Stage Crystallisation Process and Apparatus to Purify a Compound - A process to purify a compound comprising a suspension crystallization step and additionally comprises a layer crystallization step and a storage step of an intermediate product obtained from the layer crystallization step before to its further purification in the suspension crystallization step. | 12-17-2015 |
20160016799 | METHOD FOR REMOVING METAL IONS IN PHOSPHORIC ACID SOLUTION - The present invention relates to a method for removing metal ions in the phosphoric acid solution, and particularly to a method for removing metal ions in the phosphoric acid solution which comprises a step of passing an ion exchange resin through the acid solution to activate the ion exchange resin; a step of filling a resin tower with the activated ion exchange resin and washing it with ultra-pure water, and a step of passing the phosphoric acid solution to the washed ion exchange resin, thereby causing each individual concentration of metal ions with the oxidation number of 2 to 7 in the phosphoric acid solution to be less than 100 ppb. | 01-21-2016 |