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 C21B, C22B; production of non-metallic elements or inorganic compounds by electrolysis or electrophoresis 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 C01B 3/00 )
 C01B 3/00
Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it (separation of gases by physical means B01D); Purification of hydrogen (production of water-gas and synthesis gas from solid carbonaceous material C10J; purifying or modifying the chemical compositions of combustible technical gases containing carbon monoxide 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 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 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 (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 B01D 59/00; other chemical reactions to form compounds of hydrogen isotopes, see the relevant groups for hydrogen compounds in class 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 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 (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 C01B 11/00)
 C01B 7/01
·  Chlorine; Hydrogen chloride  [2]
 C01B 7/02
( covered by 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 C01B 7/01 )
 C01B 7/09
·  Bromine; Hydrogen bromide  [2]
 C01B 7/10 - 
C01B 7/12
( covered by 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 C01B 7/13 )
 C01B 7/19
·  Fluorine; Hydrogen fluoride  [2]
 C01B 7/20
·  ·  Fluorine  [2]
 C01B 7/22
( covered by 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 C01B-C01G according to the element combined with the halogen; electrolytic production of inorganic compounds 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 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 C01B-C01G or 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 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 C01B 15/023 )
 C01B 15/026
·  ·  ·  from alcohols  [3]
 C01B 15/027
·  ·  Preparation from water  [3]
 C01B 15/028
( transferred to 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 C01B 15/04, C01B 15/055 )
 C01B 15/055
·  Peroxyhydrates (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 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 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 C01C; sulphides or polysulphides of metals, other than alkali metals, magnesium, calcium, strontium, and barium, see the relevant groups of sub-classes C01F or 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 (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 C01B-C01G according to the cation)
 C01B 17/64
·  Thiosulphates; Dithionites; Polythionates
 C01B 17/66
·  ·  Dithionites
 C01B 17/68
( transferred to 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 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 C01B-C01G according to the cation)
 C01B 17/98
·  Other compounds containing sulphur and oxygen (persulphuric acids C01B 15/06; persulphates C01B 15/08)
 C01B 19/00
Selenium; Tellurium; Compounds thereof (phosphorus compounds 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 C01B 3/04)
 C01B 21/04
·  Purification or separation of nitrogen (by liquefying F25J)
 C01B 21/06
·  Binary compounds of nitrogen with metals, with silicon, or with boron (azides 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 (C01B 21/06, 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 C01B 21/082, 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 C01B 21/083, 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) (C01B 21/26, 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 C01B-C01G according to the cation)
 C01B 21/50
·  ·  Nitrous acid; Salts thereof
 C01B 21/52 - 
C01B 21/54
( transferred to C01B 21/082 )
 C01B 23/00
Noble gases; Compounds thereof; Radon (liquefying F25J)
 C01B 25/00
Phosphorus; Compounds thereof (C01B 21/00, C01B 23/00 take precedence; perphosphates 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 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 C01B 25/22; preparation involving solvent-solvent extraction 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 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 B01D 11/00)  [2]
 C01B 27/00
( transferred to C01G 28/00 )
 C01B 27/02
( transferred to C01G 28/02 )
 C01B 29/00
( transferred to C01G 30/00 )
 C01B 29/02
( transferred to C01G 30/02 )
 C01B 31/00
Carbon; Compounds thereof (C01B 21/00, C01B 23/00 take precedence; percarbonates C01B 15/10; carbon black C09C 1/48; gas carbon production C10B)
 C01B 31/02
·  Preparation of carbon (by using ultra-high pressure, e.g. for the formation of diamonds, B01J 3/06; by crystal growth 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 B01J 2/00)
 C01B 31/16
·  Preparation of ion-exchanging materials from carbonaceous material
 C01B 31/18
·  Carbon monoxide (metal carbonyls C01G)
 C01B 31/20
·  Carbon dioxide
 C01B 31/22
·  ·  Solidifying
 C01B 31/24
·  Methods for the preparation of carbonates or bicarbonates in general (percarbonates C01B 15/10; particular individual carbonates, see the relevant groups of sub-classes 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 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 (C01B 21/00, C01B 23/00 take precedence; persilicates C01B 15/14; carbides C01B 31/36)
 C01B 33/02
·  Silicon (forming a single crystal layer from the vapour phase C30B 25/00)  [2]
 C01B 33/04
·  Hydrides of silicon
 C01B 33/06
·  Metal silicides (alloys 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 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 C01B 33/158; treatment to enhance the pigmenting or filling properties C09C)
 C01B 33/187
·  ·  ·  ·  by acidic treatment of silicates  [3]
 C01B 33/193
·  ·  ·  ·  ·  of aqueous solutions of silicates  [3]
 C01B 33/20
·  Silicates (persilicates 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 B01J 49/00)
 C01B 33/30
·  ·  ·  Bleaching earth
 C01B 33/32
·  ·  Alkali metal silicates (C01B 33/26 takes precedence)
 C01B 35/00
Boron; Compounds thereof (monoborane, diborane, metal boranates or addition complexes thereof C01B 6/00; perborates C01B 15/12; binary compounds with nitrogen C01B 21/06; phosphides C01B 25/08; carbides C01B 31/36; alloys containing boron 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 (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 C01B 35/14)  [2]