C
SECTION C — CHEMISTRY; METALLURGY
 C

Note(s)

In section C, the definitions of groups of chemical elements are as follows:

  • 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 (fermentation or enzyme-using processes for the preparation of elements or inorganic compounds except carbon dioxide C12P 3/00; 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 this class, in the absence of an indication to the contrary, a compound is classified in the last appropriate place. [3]

 C01D
COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM (metal hydrides C01B 6/00; salts of oxyacids of halogens C01B 11/00; peroxides, salts of peroxyacids C01B 15/00; sulphides or polysulphides C01B 17/22; thiosulphates, dithionites, polythionates C01B 17/64; compounds containing selenium or tellurium C01B 19/00; binary compounds of nitrogen with metals C01B 21/06; azides C01B 21/08; metal amides C01B 21/092; nitrites C01B 21/50; phosphides C01B 25/08; salts of oxyacids of phosphorus C01B 25/16; carbides C01B 31/30; compounds containing silicon C01B 33/00; compounds containing boron C01B 35/00; cyanides C01C 3/08; salts of cyanic acid C01C 3/14; salts of cyanamide C01C 3/16; thiocyanates C01C 3/20)
 C01D 1/00
Oxides or hydroxides of sodium, potassium, or alkali metals in general  [2]
 C01D 1/02
·  Oxides
 C01D 1/04
·  Hydroxides
 C01D 1/20
·  ·  Preparation by reacting oxides or hydroxides with alkali metal salts
 C01D 1/22
·  ·  ·  with carbonates or bicarbonates
 C01D 1/24
·  ·  ·  from or via fluorides or silico-fluorides
 C01D 1/26
·  ·  Preparation from or via cyano coumpounds, e.g. cyanides, cyanamides
 C01D 1/28
·  ·  Purification; Separation
 C01D 1/30
·  ·  ·  by crystallisation
 C01D 1/32
·  ·  ·  by adsorption or precipitation
 C01D 1/34
·  ·  ·  with selective solvents
 C01D 1/36
·  ·  ·  by oxidation
 C01D 1/38
·  ·  ·  by dialysis
 C01D 1/40
·  ·  ·  by electrolysis
 C01D 1/42
·  ·  Concentration; Dehydration
 C01D 1/44
·  ·  Preparation in the form of granules, pieces, or other shaped products
 C01D 3/00
Halides of sodium, potassium, or alkali metals in general  [2]
 C01D 3/02
·  Fluorides
 C01D 3/04
·  Chlorides
 C01D 3/06
·  ·  Preparation by working up brines, seawater or spent lyes
 C01D 3/08
·  ·  Preparation by working up natural or industrial salt mixtures or siliceous minerals
 C01D 3/10
·  Bromides
 C01D 3/12
·  Iodides
 C01D 3/14
·  Purification
 C01D 3/16
·  ·  by precipitation or adsorption
 C01D 3/18
·  ·  with selective solvents
 C01D 3/20
·  ·  by melting
 C01D 3/22
·  Preparation in the form of granules, pieces, or other shaped products
 C01D 3/24
·  ·  Influencing the crystallisation process
 C01D 3/26
·  Preventing the absorption of moisture or caking of the crystals
 C01D 5/00
Sulphates or sulphites of sodium, potassium, or alkali metals in general  [2]
 C01D 5/02
·  Preparation of sulphates from alkali metal salts and sulphuric acid or bisulphates; Preparation of bisulphates
 C01D 5/04
·  Preparation of sulphates with the aid of sulphurous acid or sulphites, e.g. Hargreaves process
 C01D 5/06
·  Preparation of sulphates by double decomposition
 C01D 5/08
·  ·  with each other or with ammonium sulphate
 C01D 5/10
·  ·  with sulphates of magnesium, calcium, strontium, or barium
 C01D 5/12
·  Preparation of double sulphates of magnesium with sodium or potassium  [2]
 C01D 5/14
·  Preparation of sulphites (C01D 5/04 takes precedence)
 C01D 5/16
·  Purification
 C01D 5/18
·  Dehydration
 C01D 7/00
Carbonates of sodium, potassium, or alkali metals in general  [2]
 C01D 7/02
·  Preparation by double decomposition
 C01D 7/04
·  ·  with a fluoride or silico-fluoride (C01D 1/24 takes precedence)
 C01D 7/06
·  Preparation via sodium or potassium magnesium carbonate
 C01D 7/07
·  Preparation from the hydroxides  [2]
 C01D 7/08
·  Preparation from or via cyano compounds of sodium or potassium (C01D 1/26 takes precedence)
 C01D 7/10
·  Preparation of bicarbonates from carbonates (ammonia-soda process C01D 7/18)
 C01D 7/12
·  Preparation of carbonates from bicarbonates
 C01D 7/14
·  Preparation of sesquicarbonates
 C01D 7/16
·  Preparation from compounds of sodium or potassium with amines and carbon dioxide
 C01D 7/18
·  Preparation by the ammonia-soda process
 C01D 7/22
·  Purification
 C01D 7/24
·  ·  Crystallisation
 C01D 7/26
·  ·  by precipitation or adsorption
 C01D 7/28
·  ·  with selective solvents
 C01D 7/30
·  ·  by oxidation
 C01D 7/32
·  ·  by dialysis
 C01D 7/34
·  ·  by electrolysis
 C01D 7/35
·  Varying the content of water of crystallisation or the specific gravity  [2]
 C01D 7/37
·  ·  Densifying sodium carbonate  [2]
 C01D 7/38
·  Preparation in the form of granules, pieces, or other shaped products
 C01D 7/40
·  ·  Influencing the crystallisation process
 C01D 7/42
·  Preventing the absorption of moisture or caking
 C01D 9/00
Nitrates of sodium, potassium, or alkali metals in general  [2]
 C01D 9/02
·  Preparation by working-up natural salt mixtures
 C01D 9/04
·  Preparation with liquid nitric acid
 C01D 9/06
·  Preparation with gaseous nitric acid or nitrogen oxides
 C01D 9/08
·  Preparation by double decomposition
 C01D 9/10
·  ·  with ammonium nitrate
 C01D 9/12
·  ·  with nitrates of magnesium, calcium, strontium, or barium
 C01D 9/14
·  ·  of salts of potassium with sodium nitrate
 C01D 9/16
·  Purification
 C01D 9/18
·  Preparation in the form of shaped products, e.g. granules
 C01D 9/20
·  Preventing the absorption of moisture or caking
 C01D 13/00
Compounds of sodium or potassium not provided for elsewhere  [2]
 C01D 15/00
Lithium compounds  [2]
 C01D 15/02
·  Oxides; Hydroxides  [2]
 C01D 15/04
·  Halides  [2]
 C01D 15/06
·  Sulphates; Sulphites  [2]
 C01D 15/08
·  Carbonates; Bicarbonates  [2]
 C01D 15/10
·  Nitrates  [2]
 C01D 17/00
Rubidium, caesium, or francium compounds  [2]