|  | C |
SECTION C — CHEMISTRY AND METALLURGY

CHEMISTRY

|  | C01 |
INORGANIC CHEMISTRY (obtaining metal compounds by metallurgical processes Fulltext... Hierarchy... Expanded...C21B, Fulltext... Hierarchy... Expanded...C22B)

|  | C01C |
AMMONIA AND CYANOGEN AND THEIR COMPOUNDS (Fulltext... Hierarchy... Expanded...C01B takes precedence in respect of salts of oxyacids of halogens Fulltext... Hierarchy... Expanded...C01B 11/00; peroxides, persalts Fulltext... Hierarchy... Expanded...C01B 15/00; compounds containing selenium or tellurium Fulltext... Hierarchy... Expanded...C01B 19/00; azides Fulltext... Hierarchy... Expanded...C01B 21/08; imido and amido compounds other than cyanamide and its salts Fulltext... Hierarchy... Expanded...C01B 21/10; nitrites Fulltext... Hierarchy... Expanded...C01B 21/50; phosphides Fulltext... Hierarchy... Expanded...C01B 25/08; salts of oxyacids of phosphorus Fulltext... Hierarchy... Expanded...C01B 25/16; arsenic Fulltext... Hierarchy... Expanded...C01B 27/00; silicates Fulltext... Hierarchy... Expanded...C01B 33/20; antimony Fulltext... Hierarchy... Expanded...C01B 29/00, or boron Fulltext... Hierarchy... Expanded...C01B 35/00)

|  | C01C 1/00 |
Ammonia; Compounds thereof (Fulltext... Hierarchy... Expanded...C01C 3/08, Fulltext... Hierarchy... Expanded...C01C 3/14, Fulltext... Hierarchy... Expanded...C01C 3/16, Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...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 (Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...C01D-C01G according to the metal; complex ammine salts are also classified in the relevant groups in Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...C07C 129/14)

|  | C01C 3/18 |
· · | Calcium cyanamide

|  | C01C 3/20 |
· | Thiocyanic acid; Salts thereof