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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)
References relevant to classification in this subclass
This subclass does not cover:

Exceptions to the last appropriate place rule:

Metal hydrides, monoborane, diborane or addition complexes thereof

Salts of oxyacids of halogens

Peroxides, salts of peroxyacids

Sulfides or polysulfides of magnesium, calcium, strontium, or barium

Thiosulfates, dithionites, polythionates

Compounds containing selenium or tellurium

Binary compounds of nitrogen with metals

Azides

Compounds other than ammonia or cyanogen containing nitrogen and non-metals and optionally metals

Amides or imides of silicon

Metal imides or amides

Nitrites

Compounds of noble gases

Phosphides

Salts of oxyacids of phosphorus

Carbides

Compounds containing silicon

Compounds containing boron

Compounds having molecular sieve properties but not having base-exchange properties

Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites

Special rules of classification within this subclass

In the whole class C01 (thus also in this subclass C01C) is the last appropriate place rule applied (see the Note after the class title) and are chemical names to be taken in a strictly limitative sense (see the Note after the class title C01).

Ammonia; Compounds thereof {(C01C 3/08, C01C 3/14, C01C 3/16, C01C 3/20 take precedence)}
References relevant to classification in this group
This group does not cover:

Complex ammine salts, like Pt(NH3)4Cl2classified in the relevant groups according to the metal

C01D to C01G

Simple or complex cyanides of metals

Cyanic or isocyanic acid; salts thereof

Cyanamide; salts thereof

Thiocyanic acid; salts thereof

{from N2 and H2 in presence of a catalyst}
Definition statement
This subgroup covers:

Features dealing with the catalytic gas phase synthesis of ammonia and not covered by the subgroups C01C 1/0411 to C01C 1/0488 are classified in this group. Also items related to the cycle, like by-passes or specific flow connections are classified in here.

References relevant to classification in this group
This subgroup does not cover:

The preparation or purification of ammonia synthesis gas, i.e. the N2+H2 gas mixture:

{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)}
Definition statement
This subgroup covers:

This group covers the synthesis in gas phase of ammonia.

The detailed catalyst or the reactor used in the process being classified in the subgroups below.

Also heat exchangers arranged in the reactor are classified in here.

References relevant to classification in this group
This subgroup does not cover:

Arrangements of several reactors:

Informative references
Attention is drawn to the following places, which may be of interest for search:

Fixed-bed reactors:

Preparation or purification of gas mixtures for ammonia synthesis

{Separation of NH3(during purge gas treatment C01C 1/0476)}
References relevant to classification in this group
This subgroup does not cover:

Separation of ammonia from a separated purge gas flow:

{from molasses (treatment of molasses in general C13B 50/006)}
Informative references
Attention is drawn to the following places, which may be of interest for search:

Treatment of molasses in general:

C13J

Separation of ammonia from ammonia liquors, e.g. gas liquors {(as part of the ammonia synthesis process C01C 1/04)}
References relevant to classification in this group
This subgroup does not cover:

Separation of ammonia as part of the ammonia synthesis process:

Separation of ammonia from gases and vapours {(as part of the ammonia synthesis process C01C 1/04)}
References relevant to classification in this group
This subgroup does not cover:

Separation of ammonia as part of the ammonia synthesis process:

Sulfates of ammonium (C01C 1/14 takes precedence)
References relevant to classification in this group
This subgroup does not cover:

Saturators:

{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)}
References relevant to classification in this group
This subgroup does not cover:

Preparation by distillation of carbamates:

Preparation by decomposing formamide or ammonium formamate:

{Cyanogen}
Glossary of terms
In this subgroup, the following terms (or expressions) are used with the meaning indicated:

Cyanogen

C2N2

Synonyms and Keywords

In patent documents the following expressions/words and are often used as synonyms:

Cyanogen

dicyan (US-doc's and FR-doc's) and ethanedinitrile.

{Halogenides of cyanogen}
Glossary of terms
In this subgroup, the following terms (or expressions) are used with the meaning indicated:

Halogenides of cyanogen

XCN

{Thiocyanogen}
Glossary of terms
In this subgroup, the following terms (or expressions) are used with the meaning indicated:

Thiocyanogen

(SCN)2

{Sulfurdicyanide}
Glossary of terms
In this subgroup, the following terms (or expressions) are used with the meaning indicated:

Sulfurdicyanamide

S(CN)2

Preparation, {separation or purification} of hydrogen cyanide {(C01C 3/001 takes precedence)}
References relevant to classification in this group
This subgroup does not cover:

Preparations starting from nitrogen-containing organic compounds:

{from hydrocarbons and ammonia in the presence of oxygen, e.g. the Andrussow-process}
References relevant to classification in this group
This subgroup does not cover:

Preparation from hydrocarbons and ammonia in the absence of oxygen:

{from hydrocarbons and ammonia in the absence of oxygen, e.g. HMA-process}
References relevant to classification in this group
This subgroup does not cover:

Preparation from hydrocarbons and ammonia in the presence of oxygen:

Glossary of terms
In this subgroup, the following terms (or expressions) are used with the meaning indicated:

HMA

Hydrogen cyanide Methane Ammonia-process

Synonyms and Keywords

In patent documents the expression/word is often used with the meaning

BMA (German documents)

Blausäure Methan Ammoniak-Verfahren

Simple or complex cyanides of metals {(C01C 3/001, C01C 3/002 take precedence)}
References relevant to classification in this group
This subgroup does not cover:

Preparation by decomposition of nitrogen containing organic compounds:

Preparation from elementary nitrogen or carbides:

Cyanic {or isocyanic} acid; Salts thereof {(C01C 3/001 takes precedence)}
References relevant to classification in this group
This subgroup does not cover:

Preparation by decomposition of nitrogen containing organic compounds:

Glossary of terms
In this subgroup, the following terms (or expressions) are used with the meaning indicated:

Cyanic acid

HOCN

Isocyanic acid

HNCO

{Isocyanic acid; Salts thereof}
Glossary of terms
In this subgroup, the following terms (or expressions) are used with the meaning indicated:

Isocyanic acid

HNCO

Cyanamide; Salts thereof ({C01C 3/001, C01C 3/002 takes precedence}; dicyandiamide C07C 279/28)
References relevant to classification in this group
This subgroup does not cover:

Preparation by decomposition of nitrogen containing organic compounds:

Preparation from elementary nitrogen or carbides:

Dicyanamide:

Glossary of terms
In this subgroup, the following terms (or expressions) are used with the meaning indicated:

Cyanamide

H2NCN

Calcium cyanamide
Glossary of terms
In this subgroup, the following terms (or expressions) are used with the meaning indicated:

Calcium cyanamide

CaNCN

Thiocyanic acid; Salts thereof {(C01C 3/001 takes precedence)}
References relevant to classification in this group
This subgroup does not cover:

Preparation by decomposition of nitrogen containing organic compounds:

Glossary of terms
In this subgroup, the following terms (or expressions) are used with the meaning indicated:

Thiocyanic acid

hydrogen thiocyanate

Synonyms and Keywords

In patent documents the expression/word is often used with the meaning

Thiocyanic acid

HSCN

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Last Modified: 10/11/2013