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]

 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 1/28

Note(s)

  1. This group does not cover ammonium salts of complex acids (other than complex cyanides) containing a metal in the anion, which are covered by the relevant groups of subclasses C01D-C01G, according to the metal.
  2. Salts of polybasic acids with ammonium and a metal as cations are classified as though the ammonium were hydrogen.
  3. Complex ammine salts are classified in the relevant groups of subclasses 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  [3]
 C01C 3/11
·  ·  Complex cyanides  [3]
 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