GB1349887A - Removal of nitrogen oxides and other impurities from gaseous mixtures - Google Patents
Removal of nitrogen oxides and other impurities from gaseous mixturesInfo
- Publication number
- GB1349887A GB1349887A GB2228071A GB2228071A GB1349887A GB 1349887 A GB1349887 A GB 1349887A GB 2228071 A GB2228071 A GB 2228071A GB 2228071 A GB2228071 A GB 2228071A GB 1349887 A GB1349887 A GB 1349887A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mixture
- molten salt
- nitrogen oxides
- impurities
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
- F01N3/0842—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/64—Heavy metals or compounds thereof, e.g. mercury
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/68—Halogens or halogen compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/922—Mixtures of carbon monoxide or hydrocarbons and nitrogen oxides
- B01D53/925—Simultaneous elimination of carbon monoxide or hydrocarbons and nitrogen oxides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
- F01N3/0885—Regeneration of deteriorated absorbents or adsorbents, e.g. desulfurization of NOx traps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2250/00—Combinations of different methods of purification
- F01N2250/12—Combinations of different methods of purification absorption or adsorption, and catalytic conversion
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Biomedical Technology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treating Waste Gases (AREA)
- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
1349887 Removal of impurities from gaseous mixtures NORTH AMERICAN ROCKWELL CORP 19 April 1971 [20 Feb 1970 (3)] 22280/71 Heading C1A In one aspect of the invention a gas mixture containing as impurities one or more of nitrogen oxides, lead compounds, halogens, halides, metal oxides and organic compounds of N, P, As, Sb and Bi, inorganic acids, organic and inorganic sulphur-containing compounds, carboncontaining particulates and other particulate matter is contacted with a metal mesh wetted with a molten salt mixture of alkali metal carbonates to absorb the said impurities. The gases may be passed over the surface of the molten mixture or into it. When the waste gas contains nitrogen oxides and CO 2 the molten salt mixture may additionally contain carbon in order to assist in the removal of nitrogen oxides. The gaseous mixture may be produced by the combustion of a fossil fuel, any solid impurities such as fly ash or metal oxides being removed by wetting by the molten carbonate, no chemical reaction occurring. When the gaseous mixture is an automotive exhaust gas, lead compounds present therein either vaporized or in finely divided particulate form are removed by chemical reaction. In a second aspect nitrogen oxides are removed from a gaseous mixture by introducing it into a vessel containing a molten salt mixture containing alkali metal carbonates to convert the nitrogen oxides into nitrites and nitrates of the alkali metals, and contacting the molten product with carbon or a carbon-containing material as reducing agent in order to regenerate the alkali-metal carbonates for recycling to the initial stage of the process. When the gaseous mixture is obtained by burning a hydrocarbon fuel, any fly ash or solid particulate impurities may be removed prior to reaction with the molten carbonate. In a third aspect nitric oxide may be removed from a gaseous mixture by contacting it in the presence of oxygen with an unwetted catalytic packing to oxidize the nitric oxide to nitrogen dioxide which is in its turn removed by a molten salt mixture of alkali metal carbonates. The catalytic packing may be of metal or a ceramic refractory, e.g. a metal mesh of for example, stainless steel, carburized or oxidized stainless steel, a nickel alloy or a low chromium steel. Other materials such as alumina, magnesia or other refractories may be used. After contact with the molten salt the gaseous mixture may be passed through a packing to serve as a mist eliminator to remove entrained molten salt and to increase the surface contact area between the molten salt and the gas mixture. If desired the packing may be wetted with the molten carbonate mixture prior to passing the gas mixture through it. A fourth aspect of the invention comprises the removal of nitrogen oxides from a waste gas containing CO and lead compounds by contact with a molten salt mixture containing alkali metal carbonates to remove the lead compounds and then causing the CO and nitrogen oxides remaining in the lead-free gas to react in the presence of a dry catalyst. When the gas also contains CO 2 , the salt mixture may contain carbon and the waste gas may contact the molten salt mixture in the presence of a metal mesh which is wetted by the molten salt. The dry catalyst may be a mesh of a copper alloy containing 5-95% by weight of copper. The alloy may also contain nickel, iron, silicon, manganese and carbon. After contact with the dry catalyst the gas may be directed to a second catalyst which may be the same as the first catalyst to oxidize CO and any hydrocarbons present if desired with addition of oxygen. In the final aspect of the invention a gaseous mixture free from nitrogen oxides but containing impurities as in the first paragraph is contacted with the molten carbonate mixture. If desired the molten salt mixture may be used in the presence of a metal mesh or other packing. In all forms of the invention the molten salt mixture comprises the ternary eutectic of lithium, sodium and potassium which melts at about 395‹ C. Other salts, in amounts up to 90 % by weight of the mixture may be present such as alkali metal nitrates and nitrites, sulphites, sulphates, sulphides, chlorides and oxides. The mixture will absorb NO x at temperatures as high as 800‹ C., and HCl and other impurities at 1000‹ C. or higher, provided that the vapour pressure of the salt is low enough to make the system operable. The gaseous mixture may be an industrial waste gas or an automotive exhaust gas.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US1324870A | 1970-02-20 | 1970-02-20 | |
US1324670A | 1970-02-20 | 1970-02-20 | |
US1323470A | 1970-02-20 | 1970-02-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1349887A true GB1349887A (en) | 1974-04-10 |
Family
ID=27359818
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2228071A Expired GB1349887A (en) | 1970-02-20 | 1971-04-19 | Removal of nitrogen oxides and other impurities from gaseous mixtures |
Country Status (3)
Country | Link |
---|---|
JP (1) | JPS515633B1 (en) |
DE (1) | DE2108059A1 (en) |
GB (1) | GB1349887A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2540170A1 (en) * | 2015-05-04 | 2015-07-08 | Condorchem Envitech S.L. | Process for the treatment of nitrogen oxides from the storage of thermal energy by molten salts (Machine-translation by Google Translate, not legally binding) |
CN106268263A (en) * | 2016-10-17 | 2017-01-04 | 浙江大学 | A kind of preposition oxidation spray multiple pollutant cooperative control system and method |
WO2017029169A1 (en) * | 2015-08-14 | 2017-02-23 | Orion Engineered Carbons Gmbh | Methods and systems for particulate matter removal from a process exhaust gas stream |
DE102018133245A1 (en) * | 2018-12-20 | 2020-06-25 | Ferdinand-Andrei Maresi | Exhaust gas filtering using a molten salt |
CN111569611A (en) * | 2020-05-13 | 2020-08-25 | 江西师范大学 | Ternary eutectic solvent and preparation method and application thereof |
CN112266184A (en) * | 2020-09-14 | 2021-01-26 | 科立视材料科技有限公司 | Antibacterial molten salt, glass and preparation method |
CN113578030A (en) * | 2020-04-30 | 2021-11-02 | 黄华丽 | Absorbent slurry for removing mercury in flue gas, preparation method and removal method thereof |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57160368A (en) * | 1981-03-24 | 1982-10-02 | Nec Corp | Absorbing circuit for back power through thyristor system |
JP7110012B2 (en) * | 2018-07-03 | 2022-08-01 | 株式会社東芝 | ACTIVE METAL TREATMENT APPARATUS AND ACTIVE METAL TREATMENT METHOD |
CN114367179B (en) * | 2021-12-03 | 2023-04-11 | 首钢集团有限公司 | Denitration carbon fixing agent using steel slag as raw material and preparation method and application thereof |
-
1970
- 1970-12-30 JP JP45123111A patent/JPS515633B1/ja active Pending
-
1971
- 1971-02-19 DE DE19712108059 patent/DE2108059A1/en active Pending
- 1971-04-19 GB GB2228071A patent/GB1349887A/en not_active Expired
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016177923A1 (en) * | 2015-05-04 | 2016-11-10 | Condorchem Envitech Sl | Method for treating nitrogen oxides from thermal energy storage by means of molten salts |
ES2540170A1 (en) * | 2015-05-04 | 2015-07-08 | Condorchem Envitech S.L. | Process for the treatment of nitrogen oxides from the storage of thermal energy by molten salts (Machine-translation by Google Translate, not legally binding) |
US11667794B2 (en) | 2015-08-14 | 2023-06-06 | Orion Engineered Carbons Gmbh | Methods and systems for particulate matter removal from a process exhaust gas stream |
WO2017029169A1 (en) * | 2015-08-14 | 2017-02-23 | Orion Engineered Carbons Gmbh | Methods and systems for particulate matter removal from a process exhaust gas stream |
CN108137943A (en) * | 2015-08-14 | 2018-06-08 | 欧励隆工程炭公司 | For removing the method and system of particulate matter from process exhaust stream |
CN112057995A (en) * | 2015-08-14 | 2020-12-11 | 欧励隆工程炭公司 | Method and system for removing particulate matter from a process exhaust stream |
US10870762B2 (en) | 2015-08-14 | 2020-12-22 | Orion Engineered Carbons Gmbh | Methods and systems for particulate matter removal from a process exhaust gas stream |
CN106268263A (en) * | 2016-10-17 | 2017-01-04 | 浙江大学 | A kind of preposition oxidation spray multiple pollutant cooperative control system and method |
DE102018133245A1 (en) * | 2018-12-20 | 2020-06-25 | Ferdinand-Andrei Maresi | Exhaust gas filtering using a molten salt |
CN113578030B (en) * | 2020-04-30 | 2024-01-26 | 黄华丽 | Absorbent slurry for removing mercury in flue gas and preparation and removal methods thereof |
CN113578030A (en) * | 2020-04-30 | 2021-11-02 | 黄华丽 | Absorbent slurry for removing mercury in flue gas, preparation method and removal method thereof |
CN111569611A (en) * | 2020-05-13 | 2020-08-25 | 江西师范大学 | Ternary eutectic solvent and preparation method and application thereof |
CN111569611B (en) * | 2020-05-13 | 2022-03-04 | 江西师范大学 | Ternary eutectic solvent and preparation method and application thereof |
CN112266184A (en) * | 2020-09-14 | 2021-01-26 | 科立视材料科技有限公司 | Antibacterial molten salt, glass and preparation method |
Also Published As
Publication number | Publication date |
---|---|
JPS515633B1 (en) | 1976-02-21 |
DE2108059A1 (en) | 1971-08-26 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |