|  | 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 Fulltext... Hierarchy... Expanded...C21B, Fulltext... Hierarchy... Expanded...C22B; production of non-metallic elements or inorganic compounds by electrolysis or electrophoresis Fulltext... Hierarchy... Expanded...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]

|  | C01D |
COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM (metal hydrides Fulltext... Hierarchy... Expanded...C01B 6/00; salts of oxyacids of halogens Fulltext... Hierarchy... Expanded...C01B 11/00; peroxides, salts of peroxyacids Fulltext... Hierarchy... Expanded...C01B 15/00; sulphides or polysulphides Fulltext... Hierarchy... Expanded...C01B 17/22; thiosulphates, dithionites, polythionates Fulltext... Hierarchy... Expanded...C01B 17/64; compounds containing selenium or tellurium Fulltext... Hierarchy... Expanded...C01B 19/00; binary compounds of nitrogen with metals Fulltext... Hierarchy... Expanded...C01B 21/06; azides Fulltext... Hierarchy... Expanded...C01B 21/08; metal amides Fulltext... Hierarchy... Expanded...C01B 21/092; 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; carbides Fulltext... Hierarchy... Expanded...C01B 31/30; compounds containing silicon Fulltext... Hierarchy... Expanded...C01B 33/00; compounds containing boron Fulltext... Hierarchy... Expanded...C01B 35/00; cyanides Fulltext... Hierarchy... Expanded...C01C 3/08; salts of cyanic acid Fulltext... Hierarchy... Expanded...C01C 3/14; salts of cyanamide Fulltext... Hierarchy... Expanded...C01C 3/16; thiocyanates Fulltext... Hierarchy... Expanded...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 (Fulltext... Hierarchy... Expanded...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 (Fulltext... Hierarchy... Expanded...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 (Fulltext... Hierarchy... Expanded...C01D 1/26 takes precedence)

|  | C01D 7/10 |
· | Preparation of bicarbonates from carbonates (ammonia-soda process Fulltext... Hierarchy... Expanded...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]