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]

 C01C
AMMONIA; CYANOGEN; COMPOUNDS THEREOF (salts of oxyacids of halogens C01B 11/00; peroxides, salts of peroxyacids C01B 15/00; thiosulphates, dithionites, polythionates C01B 17/64; compounds containing selenium or tellurium C01B 19/00; 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; compounds containing silicon C01B 33/00; compounds containing boron C01B 35/00)
 C01C 1/00
Ammonia; Compounds thereof
 C01C 1/02
·  Preparation or separation of ammonia
 C01C 1/04
·  ·  Preparation of ammonia by synthesis (preparation or purification of gas mixtures for ammonia synthesis C01B 3/02)
 C01C 1/08
·  ·  Preparation of ammonia from nitrogenous organic substances
 C01C 1/10
·  ·  Separation of ammonia from ammonia liquors, e.g. gas liquors
 C01C 1/12
·  ·  Separation of ammonia from gases and vapours
 C01C 1/14
·  ·  ·  Saturators
 C01C 1/16
·  Halides of ammonium
 C01C 1/18
·  Nitrates of ammonium
 C01C 1/20
·  Sulphides; Polysulphides
 C01C 1/22
·  Sulphites of ammonium
 C01C 1/24
·  Sulphates of ammonium (C01C 1/14 takes precedence)
 C01C 1/242
·  ·  Preparation from ammonia and sulphuric acid or sulphur trioxide  [2]
 C01C 1/244
·  ·  Preparation by double decompostion of ammonium salts with sulphates  [2]
 C01C 1/245
·  ·  Preparation from compounds containing nitrogen and sulphur  [2]
 C01C 1/246
·  ·  ·  from sulphur-containing ammonium compounds  [2]
 C01C 1/247
·  ·  ·  ·  by oxidation with free oxygen  [2]
 C01C 1/248
·  ·  Preventing coalescing or controlling form or size of crystals  [2]
 C01C 1/249
·  ·  Deacidifying the crystals  [2]
 C01C 1/26
·  Carbonates or bicarbonates of ammonium
 C01C 1/28
·  Methods of preparing ammonium salts in general
 C01C 3/00 - 
C01C 3/00

Note(s)

Salts of polybasic acids with ammonium and a metal as cations are classified as though the ammonium were hydrogen. Ammonium salts of complex acids (other than complex cyanides) which contain a metal in the anion are classified in the relevant groups of sub-classes C01D-C01G according to the metal; complex ammine salts are also classified in the relevant groups of sub-classes C01D-C01G according to the metal.

 C01C 3/00
Cyanogen; Compounds thereof
 C01C 3/02
·  Preparation of hydrogen cyanide
 C01C 3/04
·  ·  Separation from gases
 C01C 3/06
·  Stabilisation of hydrogen cyanide
 C01C 3/08
·  Simple or complex cyanides of metals
 C01C 3/10
·  ·  Simple alkali metal cyanides
 C01C 3/11
·  ·  Complex cyanides  [2]
 C01C 3/12
·  ·  Simple or complex iron cyanides  [2]
 C01C 3/14
·  Cyanic acid; Salts thereof
 C01C 3/16
·  Cyanamide; Salts thereof (dicyandiamide C07C 129/14)
 C01C 3/18
·  ·  Calcium cyanamide
 C01C 3/20
·  Thiocyanic acid; Salts thereof