Phosphorus Compounds thereof

CCHEMISTRY METALLURGY C01Inorganic chemistry C01BNON-METALLIC ELEMENTS COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C

C01B25/00Phosphorus Compounds thereof

C01B25/003Phosphorus C01B25/006Stabilisation C01B25/01Treating phosphate ores or other raw phosphate materials to obtain phosphorus or phosphorus compounds C01B25/02Preparation of phosphorus C01B25/023of red phosphorus C01B25/027of yellow phosphorus C01B25/04Purification of phosphorus C01B25/043of red phosphorus C01B25/047of yellow phosphorus C01B25/06Hydrogen phosphides C01B25/08Other phosphides C01B25/081of alkali metals, alkaline-earth metals or magnesium C01B25/082of boron, aluminium, gallium or indium C01B25/084of boron C01B25/085of aluminium C01B25/087of gallium or indium C01B25/088containing plural metal C01B25/10Halides or oxyhalides of phosphorus C01B25/12Oxides of phosphorus C01B25/14Sulfur, selenium, or tellurium compounds of phosphorus C01B25/16Oxyacids of phosphorus Salts thereof C01B25/161containing at least one phosphorus atom with an oxidation number less than five, other than those mentioned below; Salts thereof C01B25/163Phosphorous acid Salts thereof C01B25/165Hypophosphorous acid Salts thereof C01B25/168Pyrophosphorous acid Salts thereof C01B25/18Phosphoric acid C01B25/185Preparation neither from elemental phosphorus or phosphoric anhydride nor by reacting phosphate-containing material with an acid C01B25/20Preparation from elemental phosphorus or phosphoric anhydride C01B25/22Preparation by reacting phosphate-containing material with an acid C01B25/2204Arrangements of vessels used in reacting phosphate-containing material in wet process C01B25/2208with an acid or a mixture of acids other than sulfuric acid C01B25/2212with hydrochloric acid or hydrogen chloride in aqueous medium C01B25/2216with nitric acid or nitrous vapours in aqueous medium C01B25/222with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ C01B25/223only one form of calcium sulfate being formed C01B25/2235Anhydrite processes C01B25/225Dihydrate process C01B25/226Hemihydrate process C01B25/228one form of calcium sulfate being formed and then converted to another form C01B25/2285Dihydrate-anhydrite or hemihydrate-anhydrite process C01B25/229Hemihydrate-dihydrate process C01B25/2295the conversion being performed in one or more vessels different from those used for reaction after separation of phosphoric acid C01B25/231Dihydrate-hemihydrate process C01B25/232Preparation by reacting phosphate containing material with concentrated sulfuric acid and subsequently lixiviating the obtained mass C01B25/234Purification Stabilisation Concentration C01B25/2343Concentration concomitant with purification C01B25/2346Concentration C01B25/235Clarification Stabilisation to prevent post-precipitation of dissolved impurities C01B25/237Selective elimination of impurities C01B25/2372Anionic impurities C01B25/2375Fluoride or fluosilicate anion C01B25/2377Sulfate C01B25/238Cationic impurities C01B25/24Condensed phosphoric acids C01B25/26Phosphates C01B25/265General methods for obtaining phosphates C01B25/28Ammonium phosphates C01B25/30Alkali metal phosphates C01B25/301Preparation from liquid orthophosphoric acid or from an acid solution or suspension of orthophosphates C01B25/303with elimination of impurities C01B25/305Preparation from phosphorus-containing compounds by alkaline treatment C01B25/306from phosphates C01B25/308Methods for converting an alkali metal orthophosphate into another one; Purification; Decolorasing; Dehydrating; Drying C01B25/32Phosphates of magnesium, calcium, strontium, or barium C01B25/321Methods for converting an alkaline earth metal ortho-phosphate into another ortho-phosphate C01B25/322Preparation by neutralisation of orthophosphoric acid C01B25/324Preparation from a reaction solution obtained by acidifying with an acid other than orthophosphoric acid C01B25/325Preparation by double decomposition C01B25/327After-treatment C01B25/328Defluorination during or after the preparation C01B25/34Magnesium phosphates C01B25/36Aluminium phosphates C01B25/37Phosphates of heavy metals C01B25/372of titanium, vanadium, zirconium, niobium, hafnium or tantalum C01B25/375of iron C01B25/377of manganese C01B25/38Condensed phosphates C01B25/385of alkaline-earth metals or magnesium C01B25/39of alkali metals C01B25/395Preparation and dehydrating C01B25/40Polyphosphates C01B25/405of ammonium C01B25/41of alkali metals C01B25/412Preparation from alkali metal orthophosphates C01B25/414Apparatus C01B25/416Pure alkali metal polyphosphates from impure starting materials C01B25/418After-treatment C01B25/42Pyrophosphates C01B25/425of alkali metals C01B25/44Metaphosphates C01B25/445of alkali metals C01B25/45containing plural metal, or metal and ammonium C01B25/451containing metal and ammonium C01B25/453having molecular-sieve properties C01B25/455containing halogen C01B25/4555Hypochlorite-phosphate double salts C01B25/46Preparation involving solvent-solvent extraction C01B25/461the phosphoric acid present in the medium obtained after reaction being first extracted from the liquid phase formed or separated then re-extracted as free acid by using water or as a phosphate by using a basic compound C01B25/462the extracting agent being alcohol or a mixture of alcohols C01B25/463the extracting agent being a ketone or a mixture of ketones C01B25/464the extracting agent being an ether or a mixture of ethers C01B25/465the extracting agent being an ester or a mixture of esters C01B25/466the extracting agent being a nitrogenous solvent or a mixture of nitrogenous solvents such as amines or amides C01B25/467the extracting agent being already present during the phosphate-containing material reaction step C01B25/468the extraction being performed on the reaction slurry itself