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Outline
Indent Level
Color Curly Brackets (indicating CPC extensions to IPC)

CPC
COOPERATIVE PATENT CLASSIFICATION
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AMMONIA; CYANOGEN; COMPOUNDS THEREOF (
{
metal hydrides, monoborane, diborane or addition complexes thereof C01B 6/00
}
; salts of oxyacids of halogens C01B 11/00; peroxides, salts of peroxyacids C01B 15/00; thiosulfates, dithionites, polythionates C01B 17/64; compounds containing selenium or tellurium C01B 19/00; azides C01B 21/08;
{
compounds other than ammonia or cyanogen, containing nitrogen, non-metals and optionally metals C01B 21/082
}
; metal imides or amides C01B 21/092; nitrites C01B 21/50;
{
compounds of noble gases C01B 23/0005
}
; phosphides C01B 25/08; salts of oxyacids of phosphorus C01B 25/16; compounds containing silicon C01B 33/00; compounds containing boron C01B 35/00)
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Ammonia; Compounds thereof
{
(C01C 3/08, C01C 3/14, C01C 3/16, C01C 3/20 take precedence)
}
NOTE
-
Complex ammine salts, e.g. [Pd(NH3)4]Cl2, are
{
also
}
classified in the relevant groups of subclasses C01D to C01G, according to the metal

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C01C 1/003
.
{
Storage or handling of ammonia
}
C01C 1/006
. .
{
making use of solid ammonia storage materials, e.g. complex ammine salts
}
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C01C 1/02
.
Preparation,
{
purification
}
or separation of ammonia
C01C 1/022
. .
{
Preparation of aqueous ammonia solutions, i.e. ammonia water
}
C01C 1/024
. .
{
Purification
}
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C01C 1/026
. .
{
Preparation of ammonia from inorganic compounds
}
C01C 1/028
. . .
{
from ammonium sulfate or sulfite
}
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C01C 1/04
. .
Preparation of ammonia by synthesis
{
in the gas phase
}
(preparation or purification of gas mixtures for ammonia synthesis
{
C01B 3/025
}
)
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. . .
{
from N2 and H2 in presence of a catalyst
}
C01C 1/0411
. . . .
{
characterised by the catalyst
}
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. . . .
{
characterised by the synthesis reactor, e.g. arrangement of catalyst beds and heat exchangers in the reactor (arrangement of severaL reactors C01C 1/0405; fixed-bed reactors in general B01J 8/02)
}
C01C 1/0423
. . . . .
{
Cold wall reactors
}
C01C 1/0429
. . . . .
{
Fluidized or moving bed reactors
}
C01C 1/0435
. . . . .
{
Horizontal reactors
}
C01C 1/0441
. . . . .
{
Reactors with the catalyst arranged in tubes
}
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C01C 1/0447
. . . .
{
Apparatus other than synthesis reactors
}
C01C 1/0452
. . . . .
{
Heat exchangers
}
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. . . .
{
Separation of NH3 (during purge gas treatment C01C 1/0476)
}
C01C 1/0464
. . . . .
{
by absorption in liquids, e.g. water
}
C01C 1/047
. . . . .
{
by condensation
}
C01C 1/0476
. . . .
{
Purge gas treatment, e.g. for removal of inert gases or recovery of H2
}
C01C 1/0482
. . . .
{
Process control; Start-up or cooling-down procedures
}
C01C 1/0488
. . . .
{
Processes integrated with preparations of other compounds, e.g. methanol, urea or with processes for power generation
}
C01C 1/0494
. . .
{
using plasma or electric discharge
}
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C01C 1/08
. .
Preparation of ammonia from nitrogenous organic substances
. . .
{
from molasses (treatment of molasses in general C13J)
}
C01C 1/086
. . .
{
from urea
}
. .
Separation of ammonia from ammonia liquors, e.g. gas liquors
{
(as part of the ammonia synthesis process C01C 1/04)
}
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. .
Separation of ammonia from gases and vapours
{
(as part of the ammonia synthesis process C01C 1/04)
}
C01C 1/14
. . .
Saturators
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C01C 1/16
.
Halides of ammonium
C01C 1/162
. .
{
Ammonium fluoride
}
C01C 1/164
. .
{
Ammonium chloride
}
C01C 1/166
. .
{
Ammonium bromide
}
C01C 1/168
. .
{
Ammonium iodide
}
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C01C 1/18
.
Nitrates of ammonium
C01C 1/185
. .
{
Preparation
}
C01C 1/20
.
Sulfides; Polysulfides
C01C 1/22
.
Sulfites of ammonium
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.
Sulfates of ammonium (C01C 1/14 takes precedence)
C01C 1/242
. .
Preparation from ammonia and sulfuric acid or sulfur trioxide
C01C 1/244
. .
Preparation by double decomposition of ammonium salts with sulfates
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C01C 1/245
. .
Preparation from compounds containing nitrogen and sulfur
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C01C 1/246
. . .
from sulfur-containing ammonium compounds
C01C 1/247
. . . .
by oxidation with free oxygen
C01C 1/248
. .
Preventing coalescing or controlling form or size of the crystals
C01C 1/249
. .
Deacidifying
{
or drying
}
the crystals
C01C 1/26
.
Carbonates or bicarbonates of ammonium
C01C 1/28
.
Methods of preparing ammonium salts in general
NOTE
-
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 to C01G, according to the metal.

Salts of polybasic acids with ammonium and a metal as cations are classified as though the ammonium were hydrogen.

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C01C 3/00
Cyanogen; Compounds thereof
.
{
Preparation by decomposing nitrogen-containing organic compounds, e.g. molasse waste or urea (by distillation of carbamates C01C 3/02, C01C 3/08, C01C 3/14, C01C 3/16; by decomposing formamide or ammonium formate C01C 3/0204)
}
C01C 3/002
.
{
Synthesis of metal cyanides or metal cyanamides from elementary nitrogen and carbides
}
.
{
Cyanogen
}
.
{
Halogenides of cyanogen
}
.
{
Thiocyanogen
}
.
{
Sulfurdicyanide
}
C01C 3/007
.
{
Ammonium cyanide
}
C01C 3/008
.
{
Cyanazide
}
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.
Preparation,
{
separation or purification
}
of hydrogen cyanide
{
(C01C 3/001 takes precedence)
}
C01C 3/0204
. .
{
from formamide or from ammonium formate
}
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C01C 3/0208
. .
{
Preparation in gaseous phase
}
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. . .
{
from hydrocarbons and ammonia in the presence of oxygen, e.g. the Andrussow-process
}
C01C 3/0216
. . . .
{
characterised by the catalyst used
}
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C01C 3/022
. . . .
{
Apparatus therefor
}
C01C 3/0225
. . . . .
{
characterised by the synthesis reactor
}
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. . .
{
from hydrocarbons and ammonia in the absence of oxygen, e.g. HMA-process
}
C01C 3/0233
. . . .
{
making use of fluidised beds, e.g. the Shawinigan-process
}
C01C 3/0237
. . .
{
from carbon monoxide and ammonia
}
C01C 3/0241
. . .
{
from alcohols or aldehydes
}
C01C 3/0245
. . .
{
from organic nitriles, e.g. acetonitrile
}
C01C 3/025
. . .
{
by using a plasma
}
C01C 3/0254
. .
{
from cyanates or from thiocyanates
}
C01C 3/0258
. .
{
from cyanamides or derivatives thereof
}
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C01C 3/0262
. .
{
from cyanides
}
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C01C 3/0266
. . .
{
from simple alkali or alkaline earth metal cyanides
}
C01C 3/027
. . . .
{
Alkali metal cyanides
}
C01C 3/0275
. . . .
{
Alkaline earth metal cyanides
}
C01C 3/0279
. . .
{
from ammonium cyanide
}
C01C 3/0283
. . .
{
from simple or complex cyanides of the noble metals
}
C01C 3/0287
. . .
{
from simple or complex cyanides of other transition metals, e.g. from iron cyanides
}
C01C 3/0291
. . .
{
from simple or complex cyanides of other metals
}
C01C 3/0295
. .
{
Purification
}
C01C 3/04
. .
Separation from gases
C01C 3/06
.
Stabilisation of hydrogen cyanide
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.
Simple or complex cyanides of metals
{
(C01C 3/001, C01C 3/002 take precedence)
}
C01C 3/10
. .
Simple alkali metal cyanides
C01C 3/11
. .
Complex cyanides
C01C 3/12
. .
Simple or complex iron cyanides
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.
Cyanic
{
or isocyanic
}
acid; Salts thereof
{
(C01C 3/001 takes precedence)
}
. .
{
Isocyanic acid; Salts thereof
}
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.
Cyanamide; Salts thereof (
{
C01C 3/001, C01C 3/002 takes precedence
}
; dicyandiamide C07C 279/28)
. .
Calcium cyanamide
.
Thiocyanic acid; Salts thereof
{
(C01C 3/001 takes precedence)
}
This page is owned by Office of Patent Classification.
Last Modified: 10/10/2013