C
SECTION C — CHEMISTRY AND METALLURGY
  
CHEMISTRY
 C01
INORGANIC CHEMISTRY (obtaining metal compounds by metallurgical processes C21B, C22B)
 C01C
AMMONIA AND CYANOGEN AND THEIR COMPOUNDS (C01B takes precedence in respect of salts of oxyacids of halogens C01B 11/00; peroxides, persalts C01B 15/00; compounds containing selenium or tellurium C01B 19/00; azides C01B 21/08; imido and amido compounds other than cyanamide and its salts C01B 21/10; nitrites C01B 21/50; phosphides C01B 25/08; salts of oxyacids of phosphorus C01B 25/16; arsenic C01B 27/00; silicates C01B 33/20; antimony C01B 29/00, or boron C01B 35/00)
 C01C 1/00
Ammonia; Compounds thereof (C01C 3/08, C01C 3/14, C01C 3/16, C01C 3/20 take precedence)
 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 2/30)
 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 1/26
·  Carbonates or bicarbonates of ammonium
 C01C 1/28
·  Methods of preparing ammonium salts in general
 C01C 1/28

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 in C01D-C01G according to the metal; complex ammine salts are also classified in the relevant groups in 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
·  Cyanides of metals; Complex cyanides
 C01C 3/10
·  ·  Alkali metal cyanides
 C01C 3/12
·  ·  Iron cyanides; Complexes thereof
 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