GB873997A - A process for the removal of lower oxides of nitrogen from gaseous mixtures containing them - Google Patents
A process for the removal of lower oxides of nitrogen from gaseous mixtures containing themInfo
- Publication number
- GB873997A GB873997A GB14669/59A GB1466959A GB873997A GB 873997 A GB873997 A GB 873997A GB 14669/59 A GB14669/59 A GB 14669/59A GB 1466959 A GB1466959 A GB 1466959A GB 873997 A GB873997 A GB 873997A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wash liquor
- returned
- nitrite
- carbonate
- hno3
- 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
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
- C10K1/10—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids
- C10K1/12—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids alkaline-reacting including the revival of the used wash liquors
- C10K1/122—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids alkaline-reacting including the revival of the used wash liquors containing only carbonates, bicarbonates, hydroxides or oxides of alkali-metals (including Mg)
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- Organic Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
<PICT:0873997/III/1> NO and NO2 are removed from a gaseous mixture by reacting the oxides with magnesium hydroxide and/or carbonate in aqueous suspension to form magnesium nitrite, and heating to decompose the nitrite to NO, Mg(OH)2 and Mg(NO3)2. The concentration of nitrite in the washing liquid is maintained at 200-300 grms/1. by dilution and the solids content is 20%, or less. An alkali, alkaline earth metal, or magnesium nitrate should be included in the wash liquor. Residual gas from the acid absorption stage of an HNO3 plant enters tower 1 at 14 countercurrent to an aqueous solution of Mg(NO3)2 containing suspended Mg(OH)2. NO or NO2 should be added to the waste gas to ensure that NO and NO2 mixture is present as N2O3 proportions. The wash liquor passes to pressure vessel 2 heated by steam coil 5 where, at 140 DEG -200 DEG C., the Mg(NO2)2 is decomposed to NO, Mg(OH)2 and Mg(NO3)2. The NO is oxidised in chamber 4, after decompression to maintain a pressure 3-6 atms., and returned either to the waste gas feed to tower 1 or to the HNO3 plant at 13. From 2 the wash liquor passes to precipitation tank 3, with, or without, separation of the Mg(OH)2, where addition of alkali, or alkaline earth, metal carbonate, or NH3 and CO2 converts Mg(NO3)2 to Mg(OH)2, MgCO3 and basic carbonate which may be returned to the wash liquor cycle 12 through 9 after separation of the nitrate formed. Decomposition liquor from pressure vessel 2 may also be returned to the cycle through 11.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT312258A AT209912B (en) | 1958-04-30 | 1958-04-30 | Process for removing nitrous gases from exhaust gases and apparatus for this purpose |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB873997A true GB873997A (en) | 1961-08-02 |
Family
ID=3545638
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB14669/59A Expired GB873997A (en) | 1958-04-30 | 1959-04-29 | A process for the removal of lower oxides of nitrogen from gaseous mixtures containing them |
Country Status (5)
| Country | Link |
|---|---|
| AT (1) | AT209912B (en) |
| BE (1) | BE578058A (en) |
| FR (1) | FR1221600A (en) |
| GB (1) | GB873997A (en) |
| NL (1) | NL238438A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3821744A1 (en) * | 1988-06-28 | 1990-01-11 | Bayer Ag | NITROUS OXIDE REMOVAL PROCEDURE FROM SMOKE GASES |
-
0
- NL NL238438D patent/NL238438A/xx unknown
- BE BE578058D patent/BE578058A/xx unknown
-
1958
- 1958-04-30 AT AT312258A patent/AT209912B/en active
-
1959
- 1959-04-23 FR FR792911A patent/FR1221600A/en not_active Expired
- 1959-04-29 GB GB14669/59A patent/GB873997A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL238438A (en) | |
| FR1221600A (en) | 1960-06-02 |
| AT209912B (en) | 1960-07-11 |
| BE578058A (en) |
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