|  | C |
SECTION C — CHEMISTRY AND METALLURGY

|  | C |
Note(s) Definitions for Section C: Alkali metals: Li, Na, K, Rb, Cs, Fr Alkaline earth metals: Ca, Sr, Ba, Ra Lanthanides: elements with atomic numbers 57 to 71 inclusive Rare earths: Sc, Y, Lanthanides Actinides: elements with atomic numbers 89 to 103 inclusive Refractory metals: Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W Halogens: F, Cl, Br, I, At Noble gases: He, Ne, Ar, Kr, Xe, Rn Platinum group: Os, Ir, Pt, Ru, Rh, Pd Noble metals: Ag, Au, Platinum group Light metals: alkali metals, alkaline earth metals, Be, Al, Mg Heavy metals: metals other than light metals Iron group: Fe, Co, Ni Non-metals: H, B, C, Si, N, P, O, S, Se, Te, noble gases, halogens Metals: elements other than non-metals Transition elements: elements with atomic numbers 21 to 30 inclusive, 39 to 48 inclusive, 57 to 80 inclusive, 89 upwards

CHEMISTRY

|  | C01 |
INORGANIC CHEMISTRY (obtaining metal compounds from mixtures, e.g. ores, which are intermediate compounds in a metallurgical process for obtaining a free metal Fulltext... Hierarchy... Expanded...C21B, Fulltext... Hierarchy... Expanded...C22B; production of non-metallic elements or inorganic compounds by electrolysis or electrophoresis Fulltext... Hierarchy... Expanded...C25B)

|  | C01 |
Note(s) In the absence of an indication to the contrary, a compound is classified in the last appropriate place within this class. [3]

|  | C01B |
NON-METALLIC ELEMENTS; COMPOUNDS THEREOF

|  | C01B |
Note(s) Attention is drawn to the definitions of groups of chemical elements following the title of Section C. [3]

|  | C01B 3/00 - C01B 6/00 |
Hydrogen; Hydrides; Water; Synthesis gas from hydrocarbons

|  | C01B 1/00 - C01B 2/00 |
( transferred to Fulltext... Hierarchy... Expanded...C01B 3/00 )

|  | C01B 3/00 |
Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it (separation of gases by physical means Fulltext... Hierarchy... Expanded...B01D); Purification of hydrogen (production of water-gas and synthesis gas from solid carbonaceous material Fulltext... Hierarchy... Expanded...C10J; purifying or modifying the chemical compositions of combustible technical gases containing carbon monoxide Fulltext... Hierarchy... Expanded...C10K) [3]

|  | C01B 3/02 |
· | Production of hydrogen or of gaseous mixtures containing hydrogen [3]

|  | C01B 3/04 |
· · | by decomposition of inorganic compounds, e.g. ammonia [3]

|  | C01B 3/06 |
· · | by reaction of inorganic compounds containing electro-positively bound hydrogen, e.g. water, acids, bases, ammonia, with inorganic reducing agents (by electrolysis of water Fulltext... Hierarchy... Expanded...C25B 1/04) [3]

|  | C01B 3/08 |
· · · | with metals [3]

|  | C01B 3/10 |
· · · · | by reaction of water vapour with metals [3]

|  | C01B 3/12 |
· · · | by reaction of water vapour with carbon monoxide [3]

|  | C01B 3/14 |
· · · · | Handling of heat and steam [3]

|  | C01B 3/16 |
· · · · | using catalysts [3]

|  | C01B 3/18 |
· · · · | using moving solid particles [3]

|  | C01B 3/20 |
· · · | by reaction of metal hydroxides with carbon monoxide [3]

|  | C01B 3/22 |
· · | by decomposition of gaseous or liquid organic compounds (coking liquid carbonaceous materials Fulltext... Hierarchy... Expanded...C10B 55/00) [3]

|  | C01B 3/24 |
· · · | of hydrocarbons [3]

|  | C01B 3/26 |
· · · · | using catalysts [3]

|  | C01B 3/28 |
· · · · | using moving solid particles [3]

|  | C01B 3/30 |
· · · · · | using the fluidised bed technique [3]

|  | C01B 3/32 |
· · | by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air [3]

|  | C01B 3/34 |
· · · | by reaction of hydrocarbons with gasifying agents [3]

|  | C01B 3/36 |
· · · · | using oxygen or mixtures containing oxygen as gasifying agents [3]

|  | C01B 3/38 |
· · · · | using catalysts [3]

|  | C01B 3/40 |
· · · · · | characterised by the catalyst [3]

|  | C01B 3/42 |
· · · · · | using moving solid particles [3]

|  | C01B 3/44 |
· · · · · · | using the fluidised bed technique [3]

|  | C01B 3/46 |
· · · · | using discontinuously preheated non-moving solid materials, e.g. blast and run [3]

|  | C01B 3/48 |
· · · · | followed by reaction of water vapour with carbon monoxide [3]

|  | C01B 3/50 |
· | Separation of hydrogen or hydrogen containing gases from gaseous mixtures, e.g. purification (Fulltext... Hierarchy... Expanded...C01B 3/14 takes precedence) [3]

|  | C01B 3/52 |
· · | by contacting with liquids; Regeneration of used liquids [3]

|  | C01B 3/54 |
· · · | including a catalytic reaction [3]

|  | C01B 3/56 |
· · | by contacting with solids; Regeneration of used solids [3]

|  | C01B 3/58 |
· · · | including a catalytic reaction [3]

|  | C01B 4/00 |
Hydrogen isotopes; Inorganic compounds thereof prepared by isotope exchange, e.g. NH3+D2— NH2D+HD (separation of isotopes Fulltext... Hierarchy... Expanded...B01D 59/00; other chemical reactions to form compounds of hydrogen isotopes, see the relevant groups for hydrogen compounds in class Fulltext... Hierarchy... Expanded...C01) [2]

|  | C01B 5/00 |
Water

|  | C01B 5/02 |
· | Heavy water; Preparation by chemical reaction of hydrogen isotopes or their compounds, e.g. 4ND3+7O2 4NO2+6D2O, 2D2+O2 2D2O

|  | C01B 6/00 |
Hydrides of metals; Monoborane or diborane; Addition complexes thereof (higher hydrides of boron, substituted hydrides of boron Fulltext... Hierarchy... Expanded...C01B 35/00) [2]

|  | C01B 6/02 |
· | Hydrides of transition elements; Addition complexes thereof

|  | C01B 6/04 |
· | Hydrides of alkali metals, alkaline earth metals, beryllium or magnesium; Addition complexes thereof

|  | C01B 6/06 |
· | Hydrides of aluminium, gallium, indium, thallium, germanium, tin, lead, arsenic, antimony, bismuth or polonium; Monoborane; Diborane; Addition complexes thereof

|  | C01B 6/10 |
· · | Monoborane; Diborane; Addition complexes thereof [2]

|  | C01B 6/11 |
· · · | Preparation from boron or inorganic compounds containing boron and oxygen [2]

|  | C01B 6/13 |
· · · | Addition complexes of monoborane or diborane, e.g. with phosphine, arsine or hydrazine [2]

|  | C01B 6/15 |
· · · · | Metal boranates; Addition complexes thereof [2]

|  | C01B 6/17 |
· · · · · | Preparation from boron or inorganic compounds containing boron and oxygen [2]

|  | C01B 6/19 |
· · · · · | Preparation from other compounds of boron [2]

|  | C01B 6/21 |
· · · · · · | Preparation of boranates of alkali metals, alkaline earth metals, magnesium or beryllium; Addition complexes thereof, e.g. LiBH4.2N2H4, NaB2H7 [2]

|  | C01B 6/23 |
· · · · · · | Preparation of boranates of other metals, e.g. aluminium borohydride; Addition complexes thereof, e.g. Li[Al(BH4)3H] [2]

|  | C01B 6/24 |
· | Hydrides containing at least two metals, e.g. Li(AlH4); Addition complexes thereof (Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...C01B 6/13-C01B 6/23 take precedence) [2]

|  | C01B 6/26 |
· · | Preparation from the metal with the highest valency or from its oxides or salts of its oxyacids

|  | C01B 6/34 |
· | Purification; Stabilisation

|  | C01B 7/00 - C01B 11/00 |
Halogens; Compounds thereof

|  | C01B 7/00 |
Halogens; Halogen acids (oxyacids Fulltext... Hierarchy... Expanded...C01B 11/00)

|  | C01B 7/01 |
· | Chlorine; Hydrogen chloride [2]

|  | C01B 7/02 |
( covered by Fulltext... Hierarchy... Expanded...C01B 7/01 )

|  | C01B 7/03 |
· · | Preparation from chlorides [2]

|  | C01B 7/04 |
· · · | Preparation of chlorine from hydrogen chloride

|  | C01B 7/05 |
· · · | Preparation from ammonium chloride [2]

|  | C01B 7/07 |
· · | Purification [2]

|  | C01B 7/075 |
· · · | of liquid chlorine [2]

|  | C01B 7/08 |
( covered by Fulltext... Hierarchy... Expanded...C01B 7/01 )

|  | C01B 7/09 |
· | Bromine; Hydrogen bromide [2]

|  | C01B 7/10 - C01B 7/12 |
( covered by Fulltext... Hierarchy... Expanded...C01B 7/09 )

|  | C01B 7/13 |
· | Iodine; Hydrogen iodide [2]

|  | C01B 7/14 |
· · | Iodine [2]

|  | C01B 7/16 |
· · · | Preparation from seaweed [2]

|  | C01B 7/18 |
( covered by Fulltext... Hierarchy... Expanded...C01B 7/13 )

|  | C01B 7/19 |
· | Fluorine; Hydrogen fluoride [2]

|  | C01B 7/20 |
· · | Fluorine [2]

|  | C01B 7/22 |
( covered by Fulltext... Hierarchy... Expanded...C01B 7/19 )

|  | C01B 7/24 |
· | Inter-halogen compounds

|  | C01B 9/00 |
General methods of preparing halides (particular individual halides, see the relevant groups in sub-classes Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...C01B-C01G according to the element combined with the halogen; electrolytic production of inorganic compounds Fulltext... Hierarchy... Expanded...C25B)

|  | C01B 9/02 |
· | chlorides

|  | C01B 9/04 |
· | bromides

|  | C01B 9/06 |
· | iodides

|  | C01B 9/08 |
· | fluorides

|  | C01B 11/00 |
Oxides or oxyacids of halogens; Salts thereof

|  | C01B 11/02 |
· | Oxides of chlorine

|  | C01B 11/04 |
· | Hypochlorous acid

|  | C01B 11/06 |
· · | Hypochlorites, e.g. chlorinated lime

|  | C01B 11/08 |
· | Chlorous acid

|  | C01B 11/10 |
· · | Chlorites

|  | C01B 11/12 |
· | Chloric acid

|  | C01B 11/14 |
· · | Chlorates

|  | C01B 11/16 |
· | Perchloric acid

|  | C01B 11/18 |
· · | Perchlorates

|  | C01B 11/20 |
· | Oxygen compounds of bromine

|  | C01B 11/22 |
· | Oxygen compounds of iodine

|  | C01B 11/24 |
· | Oxygen compounds of fluorine

|  | C01B 13/00 - C01B 15/00 |
Oxygen; Oxides or hydroxides in general; Per-compounds

|  | C01B 13/00 |
Oxygen; Ozone; Oxides or hydroxides in general

|  | C01B 13/02 |
· | Preparation of oxygen (by liquefying Fulltext... Hierarchy... Expanded...F25J)

|  | C01B 13/08 |
· · | from air with the aid of metal oxides, e.g. barium oxide, manganese oxide

|  | C01B 13/10 |
· | Preparation of ozone

|  | C01B 13/11 |
· · | by electric discharge [2]

|  | C01B 13/14 |
· | Methods for preparing oxides or hydroxides in general (particular individual oxides or hydroxides, see the relevant groups of sub-classes Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...C01B-C01G or Fulltext... Hierarchy... Expanded...C25B, according to the element combined with the oxygen or hydroxyl)

|  | C01B 13/16 |
· · | Purification [3]

|  | C01B 13/18 |
· · | by thermal decomposition of compounds, e.g. of salts or hydroxides [3]

|  | C01B 13/20 |
· · | by oxidation of elements in the gaseous state; by oxidation or hydrolysis of compounds in the gaseous state [3]

|  | C01B 13/22 |
· · · | of halides or oxyhalides [3]

|  | C01B 13/24 |
· · · · | in the presence of hot combustion gases [3]

|  | C01B 13/26 |
· · · · | in the presence of a fluidised bed [3]

|  | C01B 13/28 |
· · · · | using a plasma or an electric discharge [3]

|  | C01B 13/30 |
· · · · | Removal and cooling of the oxide containing suspension [3]

|  | C01B 13/32 |
· · | by oxidation or hydrolysis of elements or compounds in the liquid or solid state [3]

|  | C01B 13/34 |
· · | by oxidation or hydrolysis of sprayed or atomised solutions [3]

|  | C01B 13/36 |
· · | by precipitation reactions in solutions [3]

|  | C01B 15/00 |
Peroxides; Peroxyhydrates; Peroxyacids or salts thereof; Superoxides; Ozonides

|  | C01B 15/01 |
· | Hydrogen peroxide [3]

|  | C01B 15/013 |
· · | Separation; Purification; Concentration [3]

|  | C01B 15/017 |
· · · | Anhydrous hydrogen peroxide; Anhydrous solutions or gaseous mixtures containing hydrogen peroxide [3]

|  | C01B 15/02 |
( transferred to Fulltext... Hierarchy... Expanded...C01B 15/01 )

|  | C01B 15/022 |
· · | Preparation from organic compounds [2]

|  | C01B 15/023 |
· · · | by the alkyl-anthraquinone process [3]

|  | C01B 15/024 |
· · · | from hydrocarbons [3]

|  | C01B 15/025 |
( transferred to Fulltext... Hierarchy... Expanded...C01B 15/023 )

|  | C01B 15/026 |
· · · | from alcohols [3]

|  | C01B 15/027 |
· · | Preparation from water [3]

|  | C01B 15/028 |
( transferred to Fulltext... Hierarchy... Expanded...C01B 15/032 )

|  | C01B 15/029 |
· · | Preparation from hydrogen and oxygen [3]

|  | C01B 15/03 |
· · | Preparation from inorganic peroxy-compounds, e.g. from peroxysulphates [3]

|  | C01B 15/032 |
· · · | from metal peroxides [3]

|  | C01B 15/037 |
· · | Stabilisation by additives [3]

|  | C01B 15/04 |
· | Metal peroxides or peroxyhydrates thereof; Superoxides; Ozonides

|  | C01B 15/043 |
· · | of alkali metals, alkaline earth metals or of magnesium [2]

|  | C01B 15/047 |
· · | of heavy metals [2]

|  | C01B 15/05 |
( transferred to Fulltext... Hierarchy... Expanded...C01B 15/04, Fulltext... Hierarchy... Expanded...C01B 15/055 )

|  | C01B 15/055 |
· | Peroxyhydrates (Fulltext... Hierarchy... Expanded...C01B 15/04 takes precedence); Peroxyacids or salts thereof [3]

|  | C01B 15/06 |
· · | containing sulphur

|  | C01B 15/08 |
· · · | Peroxysulphates

|  | C01B 15/10 |
· · | containing carbon

|  | C01B 15/12 |
· · | containing boron

|  | C01B 15/14 |
· · | containing silicon

|  | C01B 15/16 |
· · | containing phosphorus

|  | C01B 17/00 |
Sulphur; Compounds thereof

|  | C01B 17/02 |
· | Preparation of sulphur; Purification

|  | C01B 17/027 |
· · | Recovery of sulphur from material containing elemental sulphur, e.g. luxmasses; Purification [3]

|  | C01B 17/033 |
· · · | using a liquid extractant [3]

|  | C01B 17/04 |
· · | from gaseous sulphur compounds including gaseous sulphides

|  | C01B 17/05 |
· · · | by wet processes [3]

|  | C01B 17/06 |
· · | from non-gaseous sulphides or materials containing such sulphides, e.g. ores

|  | C01B 17/08 |
( transferred to Fulltext... Hierarchy... Expanded...C01B 17/027 )

|  | C01B 17/10 |
· · | Finely-divided sulphur, e.g. sublimed sulphur, flowers of sulphur

|  | C01B 17/12 |
· · | Insoluble sulphur (mY-sulphur)

|  | C01B 17/14 |
( transferred to Fulltext... Hierarchy... Expanded...C01B 17/027 )

|  | C01B 17/16 |
· | Hydrogen sulphides

|  | C01B 17/18 |
· · | Hydrogen polysulphides

|  | C01B 17/20 |
· | Methods for preparing sulphides or polysulphides, in general (ammonium sulphides or polysulphides Fulltext... Hierarchy... Expanded...C01C; sulphides or polysulphides of metals, other than alkali metals, magnesium, calcium, strontium, and barium, see the relevant groups of sub-classes Fulltext... Hierarchy... Expanded...C01F or Fulltext... Hierarchy... Expanded...C01G according to the metal)

|  | C01B 17/22 |
· | Alkali metal sulphides or polysulphides

|  | C01B 17/24 |
· · | Preparation by reduction

|  | C01B 17/26 |
· · · | with carbon

|  | C01B 17/28 |
· · · | with reducing gases

|  | C01B 17/30 |
· · | Preparation from sodium or potassium amalgam with sulphur or sulphides

|  | C01B 17/32 |
· · | Hydrosulphides of sodium or potassium

|  | C01B 17/34 |
· · | Polysulphides of sodium or potassium

|  | C01B 17/36 |
· · | Purification

|  | C01B 17/38 |
· · | Dehydration

|  | C01B 17/40 |
· · | Making shaped products, e.g. granules

|  | C01B 17/42 |
· | Sulphides or polysulphides of magnesium, calcium, strontium, or barium

|  | C01B 17/43 |
· · | from oxides or hydroxides with sulphur or hydrogen sulphide

|  | C01B 17/44 |
· · | by reduction of sulphates

|  | C01B 17/45 |
· | Compounds containing sulphur and halogen, with or without oxygen

|  | C01B 17/46 |
· | Compounds containing sulphur, halogen, hydrogen, and oxygen

|  | C01B 17/48 |
· | Sulphur dioxide; Sulphurous acid

|  | C01B 17/50 |
· · | Preparation of sulphur dioxide

|  | C01B 17/52 |
· · · | by roasting sulphides (Fulltext... Hierarchy... Expanded...C22B 1/00 takes precedence)

|  | C01B 17/54 |
· · · | by burning elemental sulphur

|  | C01B 17/56 |
· · · | Separation; Purification

|  | C01B 17/58 |
· · · | Recovery of sulphur dioxide from acid tar and the like

|  | C01B 17/60 |
· · · | Isolation of sulphur dioxide from gases

|  | C01B 17/62 |
· | Methods of preparing sulphites in general (particular individual sulphites, see the relevant groups of sub-classes Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...C01B-C01G according to the cation)

|  | C01B 17/64 |
· | Thiosulphates; Dithionites; Polythionates

|  | C01B 17/66 |
· · | Dithionites

|  | C01B 17/68 |
( transferred to Fulltext... Hierarchy... Expanded...C01B 17/69 )

|  | C01B 17/69 |
· | Sulphur trioxide; Sulphuric acid [3]

|  | C01B 17/70 |
· · | Stabilisation of gamma-form sulphur trioxide

|  | C01B 17/72 |
( transferred to Fulltext... Hierarchy... Expanded...C01B 17/69 )

|  | C01B 17/74 |
· · | Preparation

|  | C01B 17/76 |
· · · | by contact processes

|  | C01B 17/765 |
· · · · | Multi-stage SO3-conversion [3]

|  | C01B 17/77 |
· · · · | Fluidised-bed processes [3]

|  | C01B 17/775 |
· · · · | Liquid phase contacting processes or wet catalysis processes [3]

|  | C01B 17/78 |
· · · · | characterised by the catalyst used

|  | C01B 17/79 |
· · · · · | containing vanadium [3]

|  | C01B 17/80 |
· · · · | Apparatus

|  | C01B 17/82 |
· · · | of sulphuric acid using a nitrogen oxide process

|  | C01B 17/84 |
· · · · | chamber process

|  | C01B 17/86 |
· · · · | tower process

|  | C01B 17/88 |
· · | Concentration of sulphuric acid

|  | C01B 17/90 |
· · | Separation; Purification

|  | C01B 17/92 |
· · · | Recovery from acid tar and the like

|  | C01B 17/94 |
· · · | Recovery from nitration acids

|  | C01B 17/96 |
· | Methods for the preparation of sulphates in general (particular individual sulphates, see the relevant groups of sub-classes Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...C01B-C01G according to the cation)

|  | C01B 17/98 |
· | Other compounds containing sulphur and oxygen (persulphuric acids Fulltext... Hierarchy... Expanded...C01B 15/06; persulphates Fulltext... Hierarchy... Expanded...C01B 15/08)

|  | C01B 19/00 |
Selenium; Tellurium; Compounds thereof (phosphorus compounds Fulltext... Hierarchy... Expanded...C01B 25/14)

|  | C01B 19/02 |
· | Elemental selenium or tellurium [3]

|  | C01B 19/04 |
· | Binary compounds [3]

|  | C01B 21/00 |
Nitrogen; Compounds thereof

|  | C01B 21/02 |
· | Preparation of nitrogen (from ammonia Fulltext... Hierarchy... Expanded...C01B 3/04)

|  | C01B 21/04 |
· | Purification or separation of nitrogen (by liquefying Fulltext... Hierarchy... Expanded...F25J)

|  | C01B 21/06 |
· | Binary compounds of nitrogen with metals, with silicon, or with boron (azides Fulltext... Hierarchy... Expanded...C01B 21/08)

|  | C01B 21/064 |
· · | with boron [3]

|  | C01B 21/068 |
· · | with silicon [3]

|  | C01B 21/072 |
· · | with aluminium [3]

|  | C01B 21/076 |
· · | with titanium or zirconium [3]

|  | C01B 21/08 |
· | Hydrazoic acid; Azides; Halogen azides

|  | C01B 21/082 |
· | Compounds containing nitrogen and non-metals (Fulltext... Hierarchy... Expanded...C01B 21/06, Fulltext... Hierarchy... Expanded...C01B 21/08 take precedence) [3]

|  | C01B 21/083 |
· · | containing one or more halogen atoms [3]

|  | C01B 21/084 |
· · · | containing also one or more oxygen atoms, e.g. nitrosyl halides [3]

|  | C01B 21/086 |
· · | containing one or more sulphur atoms [3]

|  | C01B 21/087 |
· · | containing one or more hydrogen atoms [3]

|  | C01B 21/088 |
· · · | containing also one or more halogen atoms [3]

|  | C01B 21/09 |
· · · · | Halogeno-amines, e.g. chloramine [3]

|  | C01B 21/092 |
· · · | containing also one or more metal atoms [3]

|  | C01B 21/093 |
· · · | containing also one or more sulphur atoms [3]

|  | C01B 21/094 |
· · · · | Nitrosyl containing acids [3]

|  | C01B 21/096 |
· · · · | Amidosulphonic acid; Salts thereof [3]

|  | C01B 21/097 |
· · | containing phosphorus atoms [3]

|  | C01B 21/098 |
· · · | Phosphonitrilic dihalides; Polymers thereof [3]

|  | C01B 21/10 |
( transferred to Fulltext... Hierarchy... Expanded...C01B 21/082, Fulltext... Hierarchy... Expanded...C01B 21/087 )

|  | C01B 21/12 |
· · | Carbamic acid; Salts thereof

|  | C01B 21/14 |
· · | Hydroxylamine; Salts thereof

|  | C01B 21/16 |
· · | Hydrazine; Salts thereof

|  | C01B 21/18 |
( transferred to Fulltext... Hierarchy... Expanded...C01B 21/083, Fulltext... Hierarchy... Expanded...C01B 21/088 )

|  | C01B 21/20 |
· | Nitrogen oxides; Oxyacids of nitrogen; Salts thereof

|  | C01B 21/22 |
· · | Nitrous oxide (N2O)

|  | C01B 21/24 |
· · | Nitric oxide (NO)

|  | C01B 21/26 |
· · · | Preparation by catalytic oxidation of ammonia

|  | C01B 21/28 |
· · · · | Apparatus

|  | C01B 21/30 |
· · · | Preparation by oxidation of nitrogen

|  | C01B 21/32 |
· · · · | Apparatus

|  | C01B 21/34 |
· · | Nitrogen trioxide (N2O3)

|  | C01B 21/36 |
· · | Nitrogen dioxide (NO2, N2O4) (Fulltext... Hierarchy... Expanded...C01B 21/26, Fulltext... Hierarchy... Expanded...C01B 21/30 take precedence)

|  | C01B 21/38 |
· · | Nitric acid

|  | C01B 21/40 |
· · · | Preparation by absorption of oxides of nitrogen

|  | C01B 21/42 |
· · · | Preparation from nitrates

|  | C01B 21/44 |
· · · | Concentration

|  | C01B 21/46 |
· · · | Purification; Separation

|  | C01B 21/48 |
· · | Methods for the preparation of nitrates in general (particular individual nitrates, see the relevant groups of sub-classes Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...C01B-C01G according to the cation)

|  | C01B 21/50 |
· · | Nitrous acid; Salts thereof

|  | C01B 21/52 - C01B 21/54 |
( transferred to Fulltext... Hierarchy... Expanded...C01B 21/082 )

|  | C01B 23/00 |
Noble gases; Compounds thereof; Radon (liquefying Fulltext... Hierarchy... Expanded...F25J)

|  | C01B 25/00 |
Phosphorus; Compounds thereof (Fulltext... Hierarchy... Expanded...C01B 21/00, Fulltext... Hierarchy... Expanded...C01B 23/00 take precedence; perphosphates Fulltext... Hierarchy... Expanded...C01B 15/16)

|  | C01B 25/01 |
· | Treating phosphate ores or other raw phosphate materials to obtain phosphorus or phosphorus compounds [2]

|  | C01B 25/02 |
· | Preparation of phosphorus

|  | C01B 25/023 |
· · | of red phosphorus [2]

|  | C01B 25/027 |
· · | of yellow phosphorus [2]

|  | C01B 25/04 |
· | Purification of phosphorus

|  | C01B 25/043 |
· · | of red phosphorus [2]

|  | C01B 25/047 |
· · | of yellow phosphorus [2]

|  | C01B 25/06 |
· | Hydrogen phosphides

|  | C01B 25/08 |
· | Other phosphides

|  | C01B 25/10 |
· | Halides or oxyhalides of phosphorus [2]

|  | C01B 25/12 |
· | Oxides of phosphorus

|  | C01B 25/14 |
· | Sulphur, selenium, or tellurium compounds of phosphorus

|  | C01B 25/16 |
· | Oxyacids of phosphorus; Salts thereof (peroxyacids or salts thereof Fulltext... Hierarchy... Expanded...C01B 15/00)

|  | C01B 25/163 |
· · | Phosphorous acid; Salts thereof [2]

|  | C01B 25/165 |
· · | Hypophosphorous acid; Salts thereof [2]

|  | C01B 25/168 |
· · | Pyrophosphorous acid; Salts thereof [2]

|  | C01B 25/18 |
· · | Phosphoric acid

|  | C01B 25/20 |
· · · | Preparation from elemental phosphorus or phosphoric anhydride

|  | C01B 25/22 |
· · · | Preparation by reacting phosphate containing material with an acid, e.g. wet process

|  | C01B 25/222 |
· · · · | with sulphuric acid, a mixture of acids mainly consisting of sulphuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulphur dioxide, water and oxygen [3]

|  | C01B 25/223 |
· · · · · | only one form of calcium sulphate being formed [3]

|  | C01B 25/225 |
· · · · · · | Dihydrate process [3]

|  | C01B 25/226 |
· · · · · · | Hemihydrate process [3]

|  | C01B 25/228 |
· · · · · | one form of calcium sulphate being formed and then converted to another form [3]

|  | C01B 25/229 |
· · · · · · | Hemihydrate-dihydrate process [3]

|  | C01B 25/231 |
· · · · · · | Dihydrate-hemihydrate process [3]

|  | C01B 25/232 |
· · · · · | Preparation by reacting phosphate containing material with concentrated sulphuric acid and subsequently lixiviating the obtained mass, e.g. clincker process [3]

|  | C01B 25/234 |
· · · | Purification; Stabilisation; Concentration (purification concomitant with preparation Fulltext... Hierarchy... Expanded...C01B 25/22; preparation involving solvent-solvent extraction Fulltext... Hierarchy... Expanded...C01B 25/46) [3]

|  | C01B 25/235 |
· · · · | Clarification; Stabilisation to prevent post-precipitation of dissolved impurities [3]

|  | C01B 25/237 |
· · · · | Selective elimination of impurities [3]

|  | C01B 25/238 |
· · · · · | Cationic impurities [3]

|  | C01B 25/24 |
· · | Condensed phosphoric acids

|  | C01B 25/26 |
· · | Phosphates (perphosphates Fulltext... Hierarchy... Expanded...C01B 15/16)

|  | C01B 25/28 |
· · · | Ammonium phosphates

|  | C01B 25/30 |
· · · | Alkali metal phosphates

|  | C01B 25/32 |
· · · | Phosphates of magnesium, calcium, strontium, or barium

|  | C01B 25/34 |
· · · · | Magnesium phosphates

|  | C01B 25/36 |
· · · | Aluminium phosphates

|  | C01B 25/37 |
· · · | Phosphates of heavy metals [2]

|  | C01B 25/38 |
· · · | Condensed phosphates

|  | C01B 25/39 |
· · · · | of alkali metals [3]

|  | C01B 25/40 |
· · · · | Polyphosphates [2]

|  | C01B 25/41 |
· · · · · | of alkali metals [3]

|  | C01B 25/42 |
· · · · | Pyrophosphates [2]

|  | C01B 25/44 |
· · · · | Metaphosphates [2]

|  | C01B 25/445 |
· · · · · | of alkali metals [3]

|  | C01B 25/45 |
· · · | containing plural metal, or metal and ammonium [3]

|  | C01B 25/455 |
· · · | containing halogen [3]

|  | C01B 25/46 |
· · | Preparation involving solvent-solvent extraction (extraction per se Fulltext... Hierarchy... Expanded...B01D 11/00) [2]

|  | C01B 27/00 |
( transferred to Fulltext... Hierarchy... Expanded...C01G 28/00 )

|  | C01B 27/02 |
( transferred to Fulltext... Hierarchy... Expanded...C01G 28/02 )

|  | C01B 29/00 |
( transferred to Fulltext... Hierarchy... Expanded...C01G 30/00 )

|  | C01B 29/02 |
( transferred to Fulltext... Hierarchy... Expanded...C01G 30/02 )

|  | C01B 31/00 |
Carbon; Compounds thereof (Fulltext... Hierarchy... Expanded...C01B 21/00, Fulltext... Hierarchy... Expanded...C01B 23/00 take precedence; percarbonates Fulltext... Hierarchy... Expanded...C01B 15/10; carbon black Fulltext... Hierarchy... Expanded...C09C 1/48; gas carbon production Fulltext... Hierarchy... Expanded...C10B)

|  | C01B 31/02 |
· | Preparation of carbon (by using ultra-high pressure, e.g. for the formation of diamonds, Fulltext... Hierarchy... Expanded...B01J 3/06; by crystal growth Fulltext... Hierarchy... Expanded...C30B); Purification

|  | C01B 31/04 |
· · | Graphite

|  | C01B 31/06 |
· · | Diamond

|  | C01B 31/08 |
· | Active carbon

|  | C01B 31/10 |
· · | Preparation by using gaseous activating agents

|  | C01B 31/12 |
· · | Preparation by using non-gaseous activating agents

|  | C01B 31/14 |
· · | Granulation (apparatus Fulltext... Hierarchy... Expanded...B01J 2/00)

|  | C01B 31/16 |
· | Preparation of ion-exchanging materials from carbonaceous material

|  | C01B 31/18 |
· | Carbon monoxide (metal carbonyls Fulltext... Hierarchy... Expanded...C01G)

|  | C01B 31/20 |
· | Carbon dioxide

|  | C01B 31/22 |
· · | Solidifying

|  | C01B 31/24 |
· | Methods for the preparation of carbonates or bicarbonates in general (percarbonates Fulltext... Hierarchy... Expanded...C01B 15/10; particular individual carbonates, see the relevant groups of sub-classes Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...C01B-C01G according to the cation)

|  | C01B 31/26 |
· | Compounds containing carbon and sulphur, e.g. carbon disulphide, carbon oxysulphide; Thiophosgene

|  | C01B 31/28 |
· | Phosgene

|  | C01B 31/30 |
· | Carbides (alloys Fulltext... Hierarchy... Expanded...C22)

|  | C01B 31/32 |
· · | Calcium carbide

|  | C01B 31/34 |
· · | Tungsten or molybdenum carbides

|  | C01B 31/36 |
· · | Carbides of silicon or boron

|  | C01B 33/00 |
Silicon; Compounds thereof (Fulltext... Hierarchy... Expanded...C01B 21/00, Fulltext... Hierarchy... Expanded...C01B 23/00 take precedence; persilicates Fulltext... Hierarchy... Expanded...C01B 15/14; carbides Fulltext... Hierarchy... Expanded...C01B 31/36)

|  | C01B 33/02 |
· | Silicon (forming a single crystal layer from the vapour phase Fulltext... Hierarchy... Expanded...C30B 25/00) [2]

|  | C01B 33/04 |
· | Hydrides of silicon

|  | C01B 33/06 |
· | Metal silicides (alloys Fulltext... Hierarchy... Expanded...C22)

|  | C01B 33/08 |
· | Compounds containing halogen

|  | C01B 33/10 |
· · | Compounds containing silicon, fluorine, and other elements

|  | C01B 33/107 |
· · | Halogenated silanes [3]

|  | C01B 33/113 |
· | Silicon oxides; Hydrates thereof [3]

|  | C01B 33/12 |
· · | Silica; Hydrates thereof, e.g. lepidoic silicic acid

|  | C01B 33/14 |
· · · | Colloidal silica, e.g. dispersions, gels, sols

|  | C01B 33/141 |
· · · · | Preparation of hydrosols or aqueous dispersions [3]

|  | C01B 33/142 |
· · · · · | by acidic treatment of silicates [3]

|  | C01B 33/143 |
· · · · · · | of aqueous solutions of silicates [3]

|  | C01B 33/145 |
· · · · | Preparation of hydroorganosols, organosols or dispersions in an organic medium [3]

|  | C01B 33/146 |
· · · · | After-treatment of sols (preparation of hydroorganosols, organosols or dispersions in an organic medium from hydrosols Fulltext... Hierarchy... Expanded...C01B 33/145) [3]

|  | C01B 33/148 |
· · · · · | Concentration; Drying; Dehydration; Stabilisation; Purification [3]

|  | C01B 33/149 |
· · · · · | Coating [3]

|  | C01B 33/151 |
· · · · · | by progressively adding a sol to a different sol, i.e. "build up" of particles using a "heel" [3]

|  | C01B 33/152 |
· · · · | Preparation of hydrogels [3]

|  | C01B 33/154 |
· · · · · | by acidic treatment of aqueous silicate solutions [3]

|  | C01B 33/155 |
· · · · | Preparation of hydroorganogels or organogels [3]

|  | C01B 33/157 |
· · · · | After-treatment of gels [3]

|  | C01B 33/158 |
· · · · · | Purification; Drying; Dehydrating [3]

|  | C01B 33/159 |
· · · · · | Coating or hydrophobisation [3]

|  | C01B 33/16 |
· · · | Preparation of silica xerogels

|  | C01B 33/18 |
· · · | Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof (preparation of aerogels by dehydrating gels Fulltext... Hierarchy... Expanded...C01B 33/158; treatment to enhance the pigmenting or filling properties Fulltext... Hierarchy... Expanded...C09C)

|  | C01B 33/187 |
· · · · | by acidic treatment of silicates [3]

|  | C01B 33/193 |
· · · · · | of aqueous solutions of silicates [3]

|  | C01B 33/20 |
· | Silicates (persilicates Fulltext... Hierarchy... Expanded...C01B 15/14)

|  | C01B 33/22 |
· · | Magnesium silicates

|  | C01B 33/24 |
· · | Alkaline-earth metal silicates

|  | C01B 33/26 |
· · | Aluminium-containing silicates

|  | C01B 33/28 |
· · · | Base exchange silicates, e.g. zeolites (regeneration Fulltext... Hierarchy... Expanded...B01J 49/00)

|  | C01B 33/30 |
· · · | Bleaching earth

|  | C01B 33/32 |
· · | Alkali metal silicates (Fulltext... Hierarchy... Expanded...C01B 33/26 takes precedence)

|  | C01B 35/00 |
Boron; Compounds thereof (monoborane, diborane, metal boranates or addition complexes thereof Fulltext... Hierarchy... Expanded...C01B 6/00; perborates Fulltext... Hierarchy... Expanded...C01B 15/12; binary compounds with nitrogen Fulltext... Hierarchy... Expanded...C01B 21/06; phosphides Fulltext... Hierarchy... Expanded...C01B 25/08; carbides Fulltext... Hierarchy... Expanded...C01B 31/36; alloys containing boron Fulltext... Hierarchy... Expanded...C22) [2]

|  | C01B 35/02 |
· | Boron; Borides [2]

|  | C01B 35/04 |
· · | Metal borides [2]

|  | C01B 35/06 |
· | Boron halogen compounds [2]

|  | C01B 35/08 |
· | Compounds containing boron and nitrogen, phosphorus, oxygen, sulphur, selenium or tellurium [2]

|  | C01B 35/10 |
· · | Compounds containing boron and oxygen (Fulltext... Hierarchy... Expanded...C01B 35/06 takes precedence) [2]

|  | C01B 35/12 |
· · · | Borates [2]

|  | C01B 35/14 |
· · | Compounds containing boron and nitrogen, phosphorus, sulphur, selenium or tellurium [2]

|  | C01B 35/16 |
· | Compounds containing direct bonding between two boron atoms, e.g. Cl2B—BCl2 [2]

|  | C01B 35/18 |
· | Compounds containing three or more boron atoms, e.g. Na B3H8, MgB10Br10 (borazoles Fulltext... Hierarchy... Expanded...C01B 35/14) [2]