GB1572118A - Method of introducing an organic compound having an oxygen-containing functional group and/or a parent hydrocarbon compound thereof into exhaustgas stream - Google Patents
Method of introducing an organic compound having an oxygen-containing functional group and/or a parent hydrocarbon compound thereof into exhaustgas stream Download PDFInfo
- Publication number
- GB1572118A GB1572118A GB1796177A GB1796177A GB1572118A GB 1572118 A GB1572118 A GB 1572118A GB 1796177 A GB1796177 A GB 1796177A GB 1796177 A GB1796177 A GB 1796177A GB 1572118 A GB1572118 A GB 1572118A
- Authority
- GB
- United Kingdom
- Prior art keywords
- exhaust gases
- oxygen
- methanol
- organic compound
- functional group
- 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
- 238000000034 method Methods 0.000 title claims description 38
- 150000002894 organic compounds Chemical class 0.000 title claims description 35
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims description 29
- 239000001301 oxygen Substances 0.000 title claims description 29
- 229910052760 oxygen Inorganic materials 0.000 title claims description 29
- 150000002430 hydrocarbons Chemical class 0.000 title claims description 26
- 125000000524 functional group Chemical group 0.000 title claims description 23
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 110
- 239000007789 gas Substances 0.000 claims description 57
- 238000002485 combustion reaction Methods 0.000 claims description 33
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 29
- 239000012159 carrier gas Substances 0.000 claims description 18
- 230000014759 maintenance of location Effects 0.000 claims description 17
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 15
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- 239000004411 aluminium Substances 0.000 claims description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 12
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 claims description 7
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 claims description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 6
- 238000000354 decomposition reaction Methods 0.000 claims description 6
- 235000019253 formic acid Nutrition 0.000 claims description 6
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 6
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 5
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 239000001294 propane Substances 0.000 claims description 5
- 150000001335 aliphatic alkanes Chemical class 0.000 claims description 4
- 230000003197 catalytic effect Effects 0.000 claims description 4
- 230000001590 oxidative effect Effects 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- DNIAPMSPPWPWGF-GSVOUGTGSA-N (R)-(-)-Propylene glycol Chemical compound C[C@@H](O)CO DNIAPMSPPWPWGF-GSVOUGTGSA-N 0.000 claims description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 3
- -1 aliphatic aldehyde Chemical class 0.000 claims description 3
- 150000007933 aliphatic carboxylic acids Chemical class 0.000 claims description 3
- 229910001882 dioxygen Inorganic materials 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 2
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 2
- 239000000654 additive Substances 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims description 2
- 239000010962 carbon steel Substances 0.000 claims description 2
- 230000001351 cycling effect Effects 0.000 claims description 2
- 238000011835 investigation Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000003647 oxidation Effects 0.000 claims description 2
- 238000007747 plating Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 3
- 229910002089 NOx Inorganic materials 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 235000011089 carbon dioxide Nutrition 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 150000007824 aliphatic compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Description
(54) METHOD OF INTRODUCING AN ORGANIC COMPOUND HAVING AN
OXYGEN-CONTAINING FUNCTIONAL GROUP AND A PARENT
HYDROCARBON COMPOUND THEREOF INTO EXHAUST-GAS STREAM
(71) We, MITSUBISHI JUKOGYO KABU
SHIKI KAISHA, a Japanese body corporate, of 5-1 Marunouchi 2-chome, Chiyoda-ku,
Tokyo, Japan, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to a method for controlling oxides of nitrogen (NOx) in combustion exhaust gases, and more specifically to a method of introducing an organic compound having an oxygen-containing functional group and/or its parent hydrocarbon compound into the exhaust gases in wet-process denitrification whereby nitric oxide (NO) is oxidized to nitrogen dioxide (NO2) and the NO. is removed by absorption in an absorbing solution.
As is well-known, NOx are notorious sources of air pollution (photochemical smog) and are poisonous compounds early control of which has been called for in all quarters. In an effort to meet this requirement, we previously proposed, in the copending British Patent Application No.
3818/77 (Serial No. 1572211) a process for controlling NOx in combustion exhaust gases, such as from a boiler, which comprises adding an organic compound having an oxygen-containing functional group and/ or its parent hydrocarbon compound to the gases and thereby oxidizing NO in the exhaust to NO. in the presence of oxygen.
The proposed process utilizes as the organic compound having an oxygen-containing functional group an aliphatic alcohol, an aliphatic aldehyde or an aliphatic carboxylic acid such as methanol, ethanol, formaldehyde, formic acid or the like; and/or as the parent hydrocarbon compound to the said organic compound an alkane, such as methane, ethane, propane or the like. Of those compounds, methanol appeared most promising because of low cost, ease of handling, and other merits. The oxidation reaction with methanol was presumed to consist of the following elementary reactions: CII30H+ O2HCHO + H202 (1)
HCHO + 02- > HCOOE + 0* (2)
HCOOH + O2H2O + CO2 (3) H202 + NO- > NO2 + H20 (4) O*+NONO2 (5)
(* activated atom)
It was presumed that, in the elementary reactions (1) to (5), He,02 and 0* are formed as intermediates, which then oxidize
NO.
Since the reactions take place where the organic compound having an oxygen-containing functional group, such as methanol or formaldehyde, and oxygen coexist, it is possible to use, as a parent hydrocarbon compound of the organic compound having an oxygen-containing functional group, methane, ethane, propane, or other such parent hydrocarbon compound which produces the organic compound having an oxygen-containing functional group in the presence of oxygen.
In the course of our further study on application of the process on an industrial scale, we have found a variety of problems involved in the introduction of an organic compound having an oxygen-containing functional group and/or its parent hydrocarbon compound into exhaust gases. Methanol, which ,appeared most advantageous from the industrial viewpoint for example, is desirably admitted to an exhaust-gas stream in a temperature range between 500? and 7000C, but its direct introduction, in the form of 100% vapor or liquid, into combustion equipment such as a boiler leads to the following problems. If the injection tem perature is too high (over 6000C), there will be the possibility of concentrated methanol being wastefully consumed by combustion.
In some cases there will be the danger of explosion. Moreover, methanol will sometimes fail to mix thoroughly with exhaust gases in the combustion equipment owing to a short mixing time.
As a result of an intensive search for solution to these problems, we reached the conclusion that some carrier gas should be used in introducing the organic compound having an oxygen-containing functional group and/or its parent hydrocarbon compound into exhaust gases. We then found that, in view of the construction of the combustion equipment, above all, boilers, and of the carrier gas composition and economy use of the exhaust gases themselves as the carrier is most desirable.
Thus, the present invention resides in a method of introducing an organic compound having an oxygen-containing functional group and/or a parent hydrocarbon compound into combustion exhaust gases containing nitrogen oxides and free or molecular oxygen, in wet-process denitrification which comprises adding to the exhaust gases a mixture of a carrier gas and a said organic compound and/or parent hydrocarbon compound thereby oxidizing nitric oxide in the gases to nitrogen dioxide and then removing the nitrogen dioxide by absorption in an absorbing solution, which method characterized by use of the combustion exhaust gases as carrier gases for the organic compound and/or parent hydrocarbon compound.
The organic compound having an oxygencontaining functional group is preferably an aliphatic compound.
The invention will be described more particularly with reference to the use of methanol as a typical example of an organic compound having an oxygen-containing functional group to be added to the combustion exhaust gases.
As a carrier for conveying methanol into combustion exhaust gases, many different gases, such as air, nitrogen, water vapor, carbonic acid gas, and the combustion exhaust gases, may appear usable. However, when air or the like is employed as the carrier gas, a loss of methanol due to combustion with oxygen in air will result, even though the methanol will be diluted with air, and this drawback will never be eliminated. When nitrogen or other inert gas is used instead, there will be no such loss but the amount of gas to be treated by the ab- sorbing solution will be increased because of the carrier gas supplied from outside the system. Especially when methanol is admitted to a high temperature region of the combustion equipment such as a boiler, some heat loss will result from the conveyance by the inert gas at a lower temperature.
This can have an adverse effect upon the steam generation The exhaust gases from the combustion equipment, in contrast, offer many advantages as the carrier. Having a lower oxygen concentration than air, the exhaust gases involve no danger of explosion and reduce the combustion loss of methanol to a quite negligible minimum. In addition, the exhaust gases, hot from combustion, involve only a slight heat loss from the combustion and exert no unfavorable effect on the evaporation side of the combustion vessel such as a boiler. Further, since the carrier gases are not supplied from outside the combustion system, the gas balance in the system is adequately maintained and there is no undesirable increase in the amount to be treated in the absorption step.
The invention is most advantageously applicable to the treatment of combustion exhaust gases from a boiler. At present many boilers are equipped with an exhaust-gas recycling fan so that a part (about 5 to 30Sto) of the gases, usually from the outlet of the economizer, is admitted back to the furnace.
Therefore, it is technically easy to branch out a part or whole of the exhaust gases from the recycling line and utilize it as carrier gases for the methanol vapor. From the viewpoint of cost the problems that need be considered are but a few. The advantages associated with the use of recycled exhaust gases as carrier gases for methanol vapor may be summarized as below:
(1) Since there is no gas supply from the outside, the cost can be kept low.
(2) Since the oxygen concentration is naturally lower in the combustion exhaust gases than in air, the consumption of methanol due to combustion is limited, and there is no danger of explosion.
In addition to such economic advantages, the present method offers the following advantages of special industrial value:
(3) Since the recycled exhaust gases for boilers are usually exhaust gases from the economizer outlet at about.3500 to 4000C, their use as carrier gases for methanol causes little heat loss in the boiler and has little adverse effect on the vapor side, as compared with low-temperature carrier gases such as air supplied from the outside.
(4) Through adjustment of the amount of exhaust gases to be recycled the exhaustgas temperature at the point of introduction can be set to a suitable temperature (about 500 to 7000C) and a suitable retention time for the reaction between methanol and NO can be ensured. Thus, the boiler load variation can be followed with ease.
(5) Because large boilers in use today are usually equipped with an exhaust-gas re cycling fan, the invention is applicable to them by simply providing a flue up to the point of introduction, and the cost is low.
While the method of the invention has so far been described with reference to the use of methanol as the organic compound having an oxygen-containing functional group, other organic compounds having an oxygen-containing functional group, such as ethanol, formaldehyde, and formic acid, or parent hydrocarbon compounds such as methane, ethane, and propane, may be employed as well to achieve similar effects.
In introducing the organic compound having an oxygen-containing functional group and/or its parent hydrocarbon compound into exhaust gases, it has been found undesirable to use injectors of materials generally believed suitable for the introduction of such an additive into exhaust gases, namely, stainless steels of the SUS grades (conforming to Japanese Industrial Standards G3445, 3446, 3459, and 3463), the
STBA grade (alloy steel for boilers and heat (Methanol conc. at) - (Methanol conc. at ) (injection pipe inlet) (injection pipe outlet) x 100, (Methanol conc at injection pipe inlet) the rate with injection pipes of SUS 321,
STBA 24, and STB 42 will be higher than 60% at 5000C and a retention time of 1.6
NTP (in terms of conditions of OOC and 1 atm.) sec., higher than 88% for a retention time of 3.2 NTP sec., higher than 83% at 7000C and a retention time of 1.6 NTP sec., and 100% for a retention time of 3.2 NTP sec. On the other hand, when aluminium pipes or SUS pipes lined with aluminium are used as the injection pipes, the methanol decomposition rates will be only 4% at 5000C and a retention time of 1.6 NTP sec., 10% for a retention time of 3.2 NTP sec., 9% at 700"C and a retention time of 1.6
NTP sec., and 19% for a retention time of 3.2 NTP sec. It will be appreciated by those skilled in the art that the choice of pipe material is a matter of great importance.
In this connection attention is drawn to our copending Application No. 17959/77 (Serial
No. 1572117).
WHAT WE CLAIM IS:- 1. A method of introducing an organic compound having an oxygen-containing functional group and/or a parent hydrocarbon compound thereof into combustion exhaust gases containing nitrogen oxides and free or molecular oxygen, in wet-process denitrification which comprises adding to the exhaust gases a mixture of a carrier gas and a said organic compound and/or said parent hydrocarbon compound thereby oxi- dizing nitric oxide in the gases to nitrogen exchangers, confirming to JIS G3461), and the STB grade (carbon steel for boilers and heat exchangers, conforming to JIS G3461).
These materials have sufficient catalytic action to decompose 60 to 100% of the methanol handled. After extensive investigations of materials for injection pipes, it has been confirmed that pipes of aluminium (actually in the form of aluminium oxide due to oxidation) have extremely weak catalytic action for -methanol decomposition.
Thus, when a number of methanol injection pipes are to be installed within a combustion equipment, especially a boiler, aluminium pipes will, of course, give satisfactory result. In practice, however, preference is given to pipes of mild steel or stainless steels (SUS) lined with aluminium plating or calorized on the interior surface in the usual manner, over solid aluminium pipes, in view of the heat resistance, economy, strength, ease of fabrication, and service life.
If the methanol decomposition rate (%) is expressed as dioxide and then removing the nitrogen dioxide by absorption in an absorbing solution, which method is characterised by use of the combustion exhaust gases as carrier gas for the organic compound and/or parent hydrocarbon compound.
2. A method as claimed in claim 1 in which the said mixture is added to the exhaust gas stream upstream of a point at which a portion of the exhaust gas stream is extracted for use as the carrier gas.
3. A method as claimed in claim 1 or 2 in which the mixture is added to the exhaust gases in combustion apparatus producing the exhaust gases.
4. A method as claimed in claim 3 in which the combustion apparatus is a boiler.
5. A method as claimed in any preceding claim in which the said organic compound and/or parent hydrocarbon compound is injected into the exhaust gases through at least one pipe of which at least the internal surface is substantially inert
6. A method as claimed in any preceding claim wherein the organic compound having an oxygen-containing functional group is an aliphatic alcohol, an aliphatic aldehyde or an aliphatic carboxylic acid.
7. A method as claimed in claim 6 wherein the organic compound is methanol, ethanol, formaldehyde, or formic acid.
8. A method as claimed in claim 6 or 7 wherein the parent hydrocarbon compound is an alkane, which yields an organic com
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (11)
1. A method of introducing an organic compound having an oxygen-containing functional group and/or a parent hydrocarbon compound thereof into combustion exhaust gases containing nitrogen oxides and free or molecular oxygen, in wet-process denitrification which comprises adding to the exhaust gases a mixture of a carrier gas and a said organic compound and/or said parent hydrocarbon compound thereby oxi- dizing nitric oxide in the gases to nitrogen exchangers, confirming to JIS G3461), and the STB grade (carbon steel for boilers and heat exchangers, conforming to JIS G3461).
These materials have sufficient catalytic action to decompose 60 to 100% of the methanol handled. After extensive investigations of materials for injection pipes, it has been confirmed that pipes of aluminium (actually in the form of aluminium oxide due to oxidation) have extremely weak catalytic action for -methanol decomposition.
Thus, when a number of methanol injection pipes are to be installed within a combustion equipment, especially a boiler, aluminium pipes will, of course, give satisfactory result. In practice, however, preference is given to pipes of mild steel or stainless steels (SUS) lined with aluminium plating or calorized on the interior surface in the usual manner, over solid aluminium pipes, in view of the heat resistance, economy, strength, ease of fabrication, and service life.
If the methanol decomposition rate (%) is expressed as dioxide and then removing the nitrogen dioxide by absorption in an absorbing solution, which method is characterised by use of the combustion exhaust gases as carrier gas for the organic compound and/or parent hydrocarbon compound.
2. A method as claimed in claim 1 in which the said mixture is added to the exhaust gas stream upstream of a point at which a portion of the exhaust gas stream is extracted for use as the carrier gas.
3. A method as claimed in claim 1 or 2 in which the mixture is added to the exhaust gases in combustion apparatus producing the exhaust gases.
4. A method as claimed in claim 3 in which the combustion apparatus is a boiler.
5. A method as claimed in any preceding claim in which the said organic compound and/or parent hydrocarbon compound is injected into the exhaust gases through at least one pipe of which at least the internal surface is substantially inert
6. A method as claimed in any preceding claim wherein the organic compound having an oxygen-containing functional group is an aliphatic alcohol, an aliphatic aldehyde or an aliphatic carboxylic acid.
7. A method as claimed in claim 6 wherein the organic compound is methanol, ethanol, formaldehyde, or formic acid.
8. A method as claimed in claim 6 or 7 wherein the parent hydrocarbon compound is an alkane, which yields an organic com
pound having an oxygen-containing functional group in the presence of oxygen.
9. A method as claimed in claim 8 wherein the alkane is methane, ethane or propane.
10. A method according to any preced
ing claim characterised in that said com
bustion exhaust gases utilised as said carrier
gas are a part or whole of the recycled exhaust gases branched out from an exhaustgas recycling line.
11. A method as claimed in any of the preceding claims substantially as herein described.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9276276A JPS5318466A (en) | 1976-08-05 | 1976-08-05 | Charging method for oxygen-containing hydrocarbons and/or their precursors into exhaust gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1572118A true GB1572118A (en) | 1980-07-23 |
Family
ID=14063427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1796177A Expired GB1572118A (en) | 1976-08-05 | 1977-04-29 | Method of introducing an organic compound having an oxygen-containing functional group and/or a parent hydrocarbon compound thereof into exhaustgas stream |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5318466A (en) |
| DE (1) | DE2719417C3 (en) |
| FR (1) | FR2360831A1 (en) |
| GB (1) | GB1572118A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4507129A (en) * | 1982-01-07 | 1985-03-26 | Norsk Hydro A.S. | Method of cleaning dust-containing gas mixtures from a urea plant |
| US4743436A (en) * | 1987-04-08 | 1988-05-10 | Energy And Environmental Research Corporation | Methods for preventing ammonium bisulfate formation during the noncatalytic reduction of nitric oxide |
| US4849192A (en) * | 1987-04-08 | 1989-07-18 | Energy And Environmental Research Corp. | Methods for preventing formation of sulfuric acid and related products in combustion effluents |
| US4851201A (en) * | 1987-04-16 | 1989-07-25 | Energy And Environmental Research Corporation | Methods of removing NOx and SOx emissions from combustion systems using nitrogenous compounds |
| US4861567A (en) * | 1987-04-16 | 1989-08-29 | Energy And Environmental Research Corporation | Methods of reducing NOx and SOx emissions from combustion systems |
| US5078982A (en) * | 1990-09-20 | 1992-01-07 | Molecular Technology Corporation | Reduction of nitrogen oxide in effluent gases using formaldehyde |
| US5118481A (en) * | 1990-11-09 | 1992-06-02 | Energy And Environmental Research Corporation | Methods for reducing NOx emissions from combustion effluents |
| US5171554A (en) * | 1990-09-20 | 1992-12-15 | Molecular Technology Corporation | Conversion of formaldehyde and nitrogen to a gaseous product and use of gaseous product in reduction of nitrogen oxide in effluent gases |
| US5234670A (en) * | 1990-09-20 | 1993-08-10 | Molecular Technology Corporation | Reduction of nitrogen oxide in effluent gases using NCO radicals |
| US5234671A (en) * | 1990-09-20 | 1993-08-10 | Molecular Technology Corporation | Reduction of nitrogen oxide in effluent gases using formaldehyde and/or formaldehyde-derived free radicals |
| US5270025A (en) * | 1991-04-05 | 1993-12-14 | Energy & Environmental Research Corp. | Methods for controlling N2 O emissions and for the reduction of NO.sub.x emissions in combustion systems while controlling N2 O emissions |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3441675A1 (en) * | 1984-11-15 | 1986-05-22 | L. & C. Steinmüller GmbH, 5270 Gummersbach | METHOD FOR REDUCING NO (ARROW DOWN) X (ARROW DOWN) CONTENT IN COMBUSTION GASES |
| JP4852570B2 (en) * | 2008-06-05 | 2012-01-11 | 株式会社ニフコ | clip |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS546028A (en) * | 1977-06-15 | 1979-01-17 | Hayakawa Rubber | Adhesive composition for concrete |
-
1976
- 1976-08-05 JP JP9276276A patent/JPS5318466A/en active Granted
-
1977
- 1977-04-29 GB GB1796177A patent/GB1572118A/en not_active Expired
- 1977-04-30 DE DE19772719417 patent/DE2719417C3/en not_active Expired
- 1977-05-10 FR FR7714206A patent/FR2360831A1/en active Granted
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4507129A (en) * | 1982-01-07 | 1985-03-26 | Norsk Hydro A.S. | Method of cleaning dust-containing gas mixtures from a urea plant |
| US4743436A (en) * | 1987-04-08 | 1988-05-10 | Energy And Environmental Research Corporation | Methods for preventing ammonium bisulfate formation during the noncatalytic reduction of nitric oxide |
| US4849192A (en) * | 1987-04-08 | 1989-07-18 | Energy And Environmental Research Corp. | Methods for preventing formation of sulfuric acid and related products in combustion effluents |
| US4851201A (en) * | 1987-04-16 | 1989-07-25 | Energy And Environmental Research Corporation | Methods of removing NOx and SOx emissions from combustion systems using nitrogenous compounds |
| US4861567A (en) * | 1987-04-16 | 1989-08-29 | Energy And Environmental Research Corporation | Methods of reducing NOx and SOx emissions from combustion systems |
| US5078982A (en) * | 1990-09-20 | 1992-01-07 | Molecular Technology Corporation | Reduction of nitrogen oxide in effluent gases using formaldehyde |
| US5171554A (en) * | 1990-09-20 | 1992-12-15 | Molecular Technology Corporation | Conversion of formaldehyde and nitrogen to a gaseous product and use of gaseous product in reduction of nitrogen oxide in effluent gases |
| US5234670A (en) * | 1990-09-20 | 1993-08-10 | Molecular Technology Corporation | Reduction of nitrogen oxide in effluent gases using NCO radicals |
| US5234671A (en) * | 1990-09-20 | 1993-08-10 | Molecular Technology Corporation | Reduction of nitrogen oxide in effluent gases using formaldehyde and/or formaldehyde-derived free radicals |
| US5118481A (en) * | 1990-11-09 | 1992-06-02 | Energy And Environmental Research Corporation | Methods for reducing NOx emissions from combustion effluents |
| US5270025A (en) * | 1991-04-05 | 1993-12-14 | Energy & Environmental Research Corp. | Methods for controlling N2 O emissions and for the reduction of NO.sub.x emissions in combustion systems while controlling N2 O emissions |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2719417C3 (en) | 1979-09-27 |
| FR2360831A1 (en) | 1978-03-03 |
| FR2360831B1 (en) | 1979-03-23 |
| DE2719417B2 (en) | 1979-02-15 |
| JPS5758975B2 (en) | 1982-12-13 |
| DE2719417A1 (en) | 1978-02-09 |
| JPS5318466A (en) | 1978-02-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4626417A (en) | Methods for chemically reducing nitrogen oxides | |
| US4325924A (en) | Urea reduction of NOx in fuel rich combustion effluents | |
| US4405587A (en) | Process for reduction of oxides of nitrogen | |
| US5834722A (en) | Method and apparatus for treating waste gases by exposure to electron beams | |
| GB1572118A (en) | Method of introducing an organic compound having an oxygen-containing functional group and/or a parent hydrocarbon compound thereof into exhaustgas stream | |
| US4849192A (en) | Methods for preventing formation of sulfuric acid and related products in combustion effluents | |
| US4129651A (en) | Method of removing nitrogen oxides in exhaust combustion gases | |
| US6676912B1 (en) | Method for removal of nitrogen oxides from stationary combustion sources | |
| US4743436A (en) | Methods for preventing ammonium bisulfate formation during the noncatalytic reduction of nitric oxide | |
| US4400362A (en) | Removal of nitrogen oxides from gas | |
| US4014982A (en) | Combined process for upgrading spent alkylation acid and reducing noxious gas content of waste gaseous streams | |
| US4761270A (en) | Method of reducing the oxides of nitrogen in fossil fuels combustion and combustion effluents using hydrazine and/or hydrazine compounds | |
| CN103443070B (en) | Zero discharge urea method and apparatus | |
| US5906803A (en) | Process for removing ammonia from gasification gas | |
| US5087431A (en) | Catalytic decomposition of cyanuric acid and use of product to reduce nitrogen oxide emissions | |
| US4174379A (en) | Manufacture of ammonium nitrate | |
| US4080425A (en) | Elimination of nitrogen oxides from exhaust gases with nitriles | |
| US20040076567A1 (en) | Method for abatement of waste oxide gas emissions | |
| US4873066A (en) | Low temperature process for the reduction of nitrgen oxides in an effluent | |
| US3567367A (en) | Method of removing nitrogen oxides from gases | |
| GB1572117A (en) | Method of introducing an organic compound having an oxygen-containing functional group and/or a parent hydrocarbon compound thereof into combustion exhaust gases | |
| US4003987A (en) | Waste stream treatment | |
| CZ265792A3 (en) | process for removing nitrogen oxides from waste gases | |
| US5078982A (en) | Reduction of nitrogen oxide in effluent gases using formaldehyde | |
| WO1992016454A1 (en) | Reduction of nitrogen oxide in effluent gases using nco free radicals |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 746 | Register noted 'licences of right' (sect. 46/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19940429 |