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PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
Definition statement
This subclass/group covers:

Purifying combustible gases containing carbon monoxide, e.g. synthesis gas, e.g. by dust removal, condensing non-gaseous materials, washing, adsorption using solids such as active carbon; including regeneration of purifying material.

Modifying the chemical composition of combustible gases containing carbon monoxide to produce an improved fuel, e.g. by altering the calorific value, by reducing the carbon monoxide content (e.g. to zero), by catalytic treatment or by mixing with gases.

Relationship between large subject matter areas

Production of synthesis gas (syngas) from liquid or gaseous hydrocarbons is covered by C01B 3/00.

Production of combustible gases containing carbon monoxide (including producer gas, wood gas, town gas, synthesis gas, manufactured gas and water gas) from solid carbonaceous fuels, is matter for C10J.

Destructive distillation processes, e.g. carbonisation or coking, and excluding gasification processes, are covered by subclass C10B. Combinations of gasification and destructive distillation are covered by group C10J 3/58.

Other gaseous fuels, including natural gas, substitute natural gas or synthetic natural gas (SNG) and liquefied petroleum gas (LPG), are covered by group C10L 3/00.

Modifying the properties of any distillation gases inside the oven is covered by subclass C10B

References relevant to classification in this subclass
This subclass/group does not cover:
Isolation of hydrogen from mixtures containing hydrogen and carbon monoxide

Examples of places where the subject matter of this subclass is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Multi-step process for production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
Multi-step process for preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively with hydrogen or hydrogen-containing gases, one step being the formation of initial mixture of carbon oxides and hydrogen for synthesis
Multi-step process for production of liquid hydrocarbon mixtures of undefined composition from oxides of carbon
Plants with an integrated combined cycle, having more than one engine delivering power externally to the plant
Plant characterised by the engines using gaseous fuel generated in the plant from solid fuel
Gas turbine plant with separate fuel gasifiers
Carburettors for supplying combustible mixtures to internal combustion engines

Places in relation to which this subclass is residual:

Separation of gases or vapour by diffusion
Multi-step process for production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
Multi-step process for preparation of ammonia
Multi-step process for preparation of hydrocarbons from carbon monoxide with hydrogen
Multi-step process for preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively with hydrogen or hydrogen-containing gases, one step being the formation of initial
Preparation of urea
Multi-step process for production of liquid hydrocarbon mixtures of undefined composition from oxides of carbon
Production of synthetic natural gas
Plants with an integrated combined cycle, having more than one engine delivering power externally to the plant
01K23/06
Plant characterised by the engines using gaseous fuel generated in the plant from solid fuel
Gas turbine plant with separate fuel gasifiers
Combination of fuel cell with means for gasification of solid fuel
Informative references
Attention is drawn to the following places, which may be of interest for search:
Gas washers
Chemical processes such as purification of gases or modification of the chemical composition thereof, applied to compositions other than combustible gases containing carbon monoxide
Isolation of inorganic compounds from gaseous mixtures which may include carbon monoxide
Processes of modifying the properties of distillation gases inside an oven
Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K 3/02 or C10K 3/04
Special rules of classification within this subclass

In the absence of an indication to the contrary, classification is made in the last appropriate place ("last place rule")

When necessary, multiple classification symbols have to be added to cover all the purification steps.

Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
Combustible gas containing carbon monoxide
syngas, synthesis gas, coke oven gas, pyrolysis gas, carbonisation gas
Synonyms and Keywords

In patent documents the following abbreviations are often used:

COG
Coke Oven Gas
{ working-up the condensates (recovering of NH3 and NH4 salts C01C 1/00; working-up or purifying tars and tar-oils C10C 1/00) }
References relevant to classification in this group
This subclass/group does not cover:
Working-up or purifying tars and tar-oils
Dust removal
Informative references
Attention is drawn to the following places, which may be of interest for search:
Filters, i.e. particle separators, or filtering processes specially modified for separating dispersed particles from gases or vapours
Separating dispersed particles from gases, air or vapours by liquid as separating agent
Apparatus using free vortex flow, e.g. cyclones
{by baffle plates}
Informative references
Attention is drawn to the following places, which may be of interest for search:
Separating dispersed particles from gases or vapours by inertia
{by filtration}
Informative references
Attention is drawn to the following places, which may be of interest for search:
Filters, i.e. particle separators, or filtering processes specially modified for separating dispersed particles from gases or vapours
Separating dispersed particles from gases, air or vapours by liquid as separating agent
Apparatus using free vortex flow, e.g. cyclones
{ by centrifugal forces (cyclones B04C) }
References relevant to classification in this group
This subclass/group does not cover:
Apparatus using free vortex flow, e.g. cyclones, per se
Informative references
Attention is drawn to the following places, which may be of interest for search:
Separating dispersed particles from gases or vapours by centrifugal force
by cooling to condense non-gaseous materials { (C10K 1/001 takes precedence) }
Special rules of classification within this group

C10K 1/001 takes precedence

combined with spraying with water { (C10K 1/001 takes precedence) }
Special rules of classification within this group

C10K 1/001 takes precedence

by washing with liquids; Reviving the used wash liquors (gas washers B01D)
Definition statement
This subclass/group covers:

Acid gas removal, e.g. H2S, HCN, CO2, by absorption process, e.g. amine scrubbing

Informative references
Attention is drawn to the following places, which may be of interest for search:
Gas washers per se
Separation of gases or vapours by absorption, such as acid gas removal
hydrocarbon oils { (C10K 1/165 takes precedence) }
Special rules of classification within this group

C10K 1/165 takes precedence

by treating with solids; Regenerating spent purifying masses { (separation by adsorption B01D 53/02; separation by chemical reaction B01D 53/34 ; refining of hydrocarbon oils with acids C10G 17/02, C10G 27/02, C10G 29/12) }
Definition statement
This subclass/group covers:

Adsorption of impurities

References relevant to classification in this group
This subclass/group does not cover:
Separation of gases by adsorption, e.g. PSA
Separation of gases by chemical reaction
Informative references
Attention is drawn to the following places, which may be of interest for search:
Adsorbents per se
with selectively adsorptive solids, e.g. active carbon
Informative references
Attention is drawn to the following places, which may be of interest for search:
Adsorbents per se
by catalytic conversion of impurities to more readily removable materials
Definition statement
This subclass/group covers:

e.g. carbonyl sulfide (COS) hydrolysis

Modifying the chemical composition of combustible gases containing carbon monoxide to produce an improved fuel, e.g. one of different calorific value, which may be free from carbon monoxide
Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:

In this main group, the following terms (or expressions) are used with the meaning indicated:

Calorific value
Thermal energy content
reducing the carbon monoxide content { e.g. water-gas shift [WGS} ]
Informative references
Attention is drawn to the following places, which may be of interest for search:
Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of water vapour with carbon monoxide, water gas-shift reaction or WGS
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Last Modified: 10/11/2013