DE2752918A1 - Removal of sulphur oxide and nitrogen oxide cpds. from waste gas - by scrubbing with aq. liquor, using urea or prim. amine to destroy nitrous acid - Google Patents
Removal of sulphur oxide and nitrogen oxide cpds. from waste gas - by scrubbing with aq. liquor, using urea or prim. amine to destroy nitrous acidInfo
- Publication number
- DE2752918A1 DE2752918A1 DE19772752918 DE2752918A DE2752918A1 DE 2752918 A1 DE2752918 A1 DE 2752918A1 DE 19772752918 DE19772752918 DE 19772752918 DE 2752918 A DE2752918 A DE 2752918A DE 2752918 A1 DE2752918 A1 DE 2752918A1
- Authority
- DE
- Germany
- Prior art keywords
- urea
- liquor
- washing liquid
- nitrous acid
- scrubbing
- 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.)
- Pending
Links
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 239000004202 carbamide Substances 0.000 title claims abstract description 14
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 title claims abstract description 12
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims description 44
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 title claims description 7
- 238000005201 scrubbing Methods 0.000 title abstract description 5
- 150000001412 amines Chemical class 0.000 title abstract 4
- 239000002912 waste gas Substances 0.000 title abstract 2
- 150000003839 salts Chemical class 0.000 claims abstract description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 claims abstract description 3
- 150000003467 sulfuric acid derivatives Chemical class 0.000 claims abstract 2
- 239000007788 liquid Substances 0.000 claims description 21
- 238000005406 washing Methods 0.000 claims description 20
- 239000007789 gas Substances 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 9
- 229910052815 sulfur oxide Inorganic materials 0.000 claims description 9
- 150000003141 primary amines Chemical class 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 4
- 239000011593 sulfur Substances 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 2
- 230000002378 acidificating effect Effects 0.000 claims description 2
- 238000002386 leaching Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 4
- 229910021653 sulphate ion Inorganic materials 0.000 abstract description 4
- -1 sulphate ions Chemical class 0.000 abstract description 4
- 239000002253 acid Substances 0.000 abstract description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 abstract 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 7
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910001868 water Inorganic materials 0.000 description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
- 229910017604 nitric acid Inorganic materials 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 150000001298 alcohols Chemical class 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- RAFRTSDUWORDLA-UHFFFAOYSA-N phenyl 3-chloropropanoate Chemical compound ClCCC(=O)OC1=CC=CC=C1 RAFRTSDUWORDLA-UHFFFAOYSA-N 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 208000004434 Calcinosis Diseases 0.000 description 1
- 206010010774 Constipation Diseases 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 150000003868 ammonium compounds Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- LVGQIQHJMRUCRM-UHFFFAOYSA-L calcium bisulfite Chemical compound [Ca+2].OS([O-])=O.OS([O-])=O LVGQIQHJMRUCRM-UHFFFAOYSA-L 0.000 description 1
- 235000010260 calcium hydrogen sulphite Nutrition 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- JGIATAMCQXIDNZ-UHFFFAOYSA-N calcium sulfide Chemical compound [Ca]=S JGIATAMCQXIDNZ-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000035613 defoliation Effects 0.000 description 1
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 150000002826 nitrites Chemical class 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000010802 sludge Substances 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
- B01D53/60—Simultaneously removing sulfur oxides and 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
- 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)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Reinigen vonThe invention relates to a method for cleaning
mit Schwe5'el- und Stickoxiden verunreinigten Abgasen, bei dem die Abgase mit einer wässrigen Waschflüssigkeit in Kontakt gebracht und die entstehenden Sulfit-bzw. Sulfationen mittels in der Waschflüssigkeit vorhandene Fällungsmittel in Form von Salzen ausgefällt werden.exhaust gases polluted with sulfur and nitrogen oxides, in which the Exhaust gases brought into contact with an aqueous scrubbing liquid and the resulting Sulfite or. Sulphate ions by means of precipitants present in the washing liquid be precipitated in the form of salts.
Zum Reinigen von mit umweltschädlichen Schadstoffen, insbesondere mit Schfeloxiden, behafteten Abgasen, beispielsweise von Abgasen aus kohlebefeuerten Kraftwerken, sind sogenannte Naßentschvefelungsverfahren bekanntgeworden. Bei diesen Verfahren werden die Abgase in Stoffaustausch mit wässrigen Waschflüssigkeiten, die mit geeigneten Fällungsmitteln für die im Zuge des Stoffaustauschs sich bildenden Sulfit- bzw. Sulfationen angereichert sind, gebracht. Als Fällungsmittel sind dabei Alkali-, Erdalkali- und Ammoniumverbindungen bekanntgeworden.For cleaning with environmentally harmful pollutants, in particular with sulfur oxides, contaminated exhaust gases, for example from exhaust gases from coal-fired Power plants, so-called wet defoliation methods have become known. With these Process, the exhaust gases in mass transfer with aqueous washing liquids, those with suitable precipitants for those that form in the course of the exchange of substances Sulphite or sulphate ions are enriched, brought. As precipitants are included Alkali, alkaline earth and ammonium compounds have become known.
In der Regel enthalten die zu reinigenden Abgasen neben Schwefeloxiden aber auch schädliche Stickoxide (NOx), wie zum Beispiel NO und N02, die aus Umweltschutzgründenebenfalls aus dem Abgas abgetrennt werden müssen.As a rule, the exhaust gases to be cleaned contain sulfur oxides as well as sulfur oxides but also harmful nitrogen oxides (NOx), such as NO and N02, which are also used for environmental reasons must be separated from the exhaust gas.
Der Erfindung liegt die Aufgabe zugrunde, ein wirksames Verfahren zum Abtrennen und Unschädlichnachen von in Abgasen enthaltenen Stickoxiden zu entwickeln.The invention is based on the object of an effective method for the separation and harmlessing of nitrogen oxides contained in exhaust gases.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Stickoxide zusammen mit den Schwefeloxiden ausgewaschen Hnd der Waschflüssigkeit Harnstoff und/oder primäre -;mine zugemischt werden.This object is achieved according to the invention in that the nitrogen oxides urea is washed out together with the sulfur oxides and the washing liquid and / or primary mines are added.
Durch die erfindungsgemäße Verfahrensweise gelingt es, die im Abgas enthaltenen schädlichen Stickoxide (;NOx) in unschädliche Substanzen umzuwandeln. Der Umwandlung liegt dabei im wesentlichen folgenderchemischer Reaktionsablauf zugrunde: Im Zuge des Stoffaustauschs des Abgases mit der Waschflüssigkeit reagiert das im Abgas enthaltene NO. mit x Wasser. Es entsteht zu gleichen Teilen Salpetersäure (HN03) und salpetrige Säure <HNO2). The procedure according to the invention makes it possible to convert the harmful nitrogen oxides (NOx) contained in the exhaust gas into harmless substances. The conversion is essentially based on the following chemical reaction sequence: The NO contained in the exhaust gas reacts in the course of the exchange of substances between the exhaust gas and the scrubbing liquid. with x water. Equal parts of nitric acid (HN03) and nitrous acid <HNO2) are produced.
Dabei sind die entstehende Salpetersäure bzw. die sich durch Reaktion mit dem in der Uaschlüssigkeit vorhandenen Fällungsmitteln bildenden Nitrate stabil.The resulting nitric acid or which is caused by reaction stable with the precipitant-forming nitrates present in the liquid.
Im Gegensatz dazu sind die entstehende salpetrige Säure bzw. die durch Reaktion mit dem Fällungsmittel entstehenden Nitrite jedoch unstabil und zerfallen sofort wieder, wobei im wesentlichen entweder erneut N02 oder andere giftige Stickoxidverbindungen der Art NxOy, mit X und V ganze Zahlen entstehen.In contrast, the resulting nitrous acid or the through Reaction with the precipitating agent, however, the nitrites are unstable and disintegrate immediately again, with essentially either renewed NO2 or other toxic nitric oxide compounds of the type NxOy, with X and V whole numbers arise.
Erfindungsgemäß wurde erkannt, daß sich diese unerwünschen Zerfallsreaktionen verhindern lassen, wenn der Waschflüssigkeit Harnstoff (CO (NH2>2) und/oder primäre Amine (R-NH2) zugemischt werden. Ein primäres Amin leitet sich von Ammoniak (NH) ab, indem ein H-Atom durch eine Alkylgruppe (R) ersetzt wird.According to the invention it was recognized that these undesirable disintegration reactions let prevent if the washing liquid urea (CO (NH2> 2) and / or primary Amines (R-NH2) are added. A primary amine derives from ammonia (NH) by replacing an H atom with an alkyl group (R).
So entstehen durch Reaktion zwischen salpetriger Säure und Harnstoff nach der Reaktionsgleichung Wasser, Stickstoff und Kohlendioxid, also Bstandteile, die allesamt ungefährlich sind und ohne Schwierigkeiten abgezogen werden können.This results from the reaction between nitrous acid and urea according to the reaction equation Water, nitrogen and carbon dioxide, i.e. components that are all harmless and can be removed without difficulty.
Ähnlich verhält es sich bei der Reaktion zwischen salpetriger Säure und primären Aminen.The same applies to the reaction between nitrous acid and primary amines.
Nach der Reaktionsleichung entstehen Alkohole, Stickstoff und Wasser.According to the reaction equation alcohols, nitrogen and water are produced.
Auch durch diese Reaktion gelingt es somit, die gefährlichen Stickoxide in harmlosen Stickstoff umzuwandeln. Die entstehenden Alkohole sind in der Waschflüssigkeit gut löslich und führen daher innerhalb des Waschflüssigkeits#reislaufes zu keinerlei Verstopfungen oder andersartigen Behinderungen.This reaction also makes it possible to remove the dangerous nitrogen oxides to convert to harmless nitrogen. The resulting alcohols are in the washing liquid easily soluble and therefore do not lead to any in the washing liquid # Reislaufes Constipation or other type of disability.
Weitere Erläuterungen zu der Erfindung sind dem in der Figur schemtaisch dargestellten Ausführugnsbeispiel zu entnehmen Die Figur zeigt eine Anlage zum Reinigen von Abgasen, die mit Schwefel- und Stickoxiden, insbesondere mit S02 und N02 Werunreinigt sind. Hierbei werden die zu reinigenden Abgase über eine Leitung 1 einem Waschbehälter 2 zugeführt und dort mit einer wässrigen, Calciumhydroxid und Harnstoff enthaltenden Waschflüssigkeit, die dem Waschbehälter 2 bei einem pH-Wert zwischen 9 und 11 über eine Leitung 3 zugeführt wird, in Kontakt gebracht.Further explanations of the invention are schematically shown in the figure The figure shows an installation for cleaning of exhaust gases polluted with sulfur and nitrogen oxides, in particular with S02 and N02 are. Here, the exhaust gases to be cleaned are transferred to a washing tank via a line 1 2 supplied and there with an aqueous one containing calcium hydroxide and urea Washing liquid, which the washing container 2 at a pH value between 9 and 11 over a line 3 is supplied, brought into contact.
Das gereinigte Abgas wird über eine Leitung 4 aus der Anlage abgezogen.The cleaned exhaust gas is withdrawn from the system via a line 4.
Im Zuge der Auswaschung der Schwefel- und Stickoxide, bei der der pH-Wert der Waschflüssigkeit in den sauren Bereich, vorzugsweise auf einen Wert zwischen 3 und 5 abgesenkt werden kann, entstehen sowohl schwefelig.In the course of the leaching of sulfur and nitrogen oxides, in which the pH of the washing liquid in the acidic range, preferably to a value can be lowered between 3 and 5, arise both sulphurous.
Säure und Schwefelsäure als auch Salpetersäure und salpetrige Säure sowie die entsprechenden Calciumsalze dieser Säuren, wobei infolge des vorliegenden pH- Wertes des Calciumnitrit (Ca (N02) 2) sich nach der Reaktionsgleichung sofort wieder in salpetrige Säure zurückbildet.Acid and sulfuric acid as well as nitric acid and nitrous acid as well as the corresponding calcium salts of these acids, whereby due to the existing pH value of the calcium nitrite (Ca (NO2) 2) according to the reaction equation immediately reverts to nitrous acid.
Die beladene Waschflüssigkeit wird dann über eine Leitung 5 einem Oxydationsbehälter 6 zugeführt, in dem das nicht oder nur schlecht deponierbare Calciumsulfid bzw. Calciumbisulfit in Gegenwart von Luftsauerstoff, der über eine Leitung 7 dem Oxydationsbehälter 6 zugeführt und als Restgas über eine Leitung 8 aus diesem wieder ausgezogen wird, zu Calciumsulfat oxydiert wird.The loaded washing liquid is then via a line 5 a Oxidation tank 6 supplied, in which the difficult or impossible to deposit Calcium sulfide or calcium bisulfite in the presence of atmospheric oxygen, which has a Line 7 is fed to the oxidation tank 6 and as residual gas via a line 8 is withdrawn from this again, is oxidized to calcium sulfate.
Gleichzeitug wird infolge der Anwesenheit von Harnstoff in der Waschflüssigkeit die unstabile, unter Bildung giftiger Stickoxyde zum Zerfall neigende salpetrige Säure in harmlose Bestandteile umgewandelt. Nach der Gleichung entsteht dabei neben Wasser und Cm~2 harmloser Stickstoff, der ebenfalls über die Leitung 8 aus dem Oxydationsbehälter 6 abgezogen werden kann.At the same time, due to the presence of urea in the washing liquid, the unstable nitrous acid, which tends to decompose with the formation of toxic nitrogen oxides, is converted into harmless components. According to the equation In addition to water and Cm ~ 2, harmless nitrogen is produced, which can also be withdrawn from the oxidation tank 6 via the line 8.
Die stark mit Calciumsulfat angereicherte Waschflüssigkeit wird nunmehr aus dem Oxydationsbehälter 6 über eine Leitung 10 einem Sinkabscheider 11 zugeführt. Der sich absetzende Sulfatschlamm wird über eine Leitung 12 aus der Anlage abgezogen,w ährend der wässrige Überlauf des Abscheiders 11 über die Leitung 3 erneut dem Waschbehälter 2 zugeleitet wird. Die benötigte frische Calciumhyd -roxidlösung sowieder Harnstoff werden dem Kreislauf über eine Leitung 13 zugeführt.The washing liquid, which is heavily enriched with calcium sulfate, is now fed from the oxidation tank 6 via a line 10 to a sink separator 11. The sulphate sludge which settles is drawn off from the system via a line 12, w During the aqueous overflow of the separator 11 via the line 3 again the washing tank 2 is forwarded. The fresh calcium hydroxide solution required as well Urea are fed to the circuit via a line 13.
Unter Umständen kann es sich auch als zweckmäßig erweisen, den Harnstoff erst nach dem Sinkabscheider 11 über eine Leitung 9 der Waschflüssigkeit zuzuführen.Under certain circumstances it can also prove useful to use the urea only after the sink separator 11 is fed to the washing liquid via a line 9.
Falls, zum Beispiel infolge zu geringer Schwefeloxidkonzentration im Abgas oder eines zu hohen pH-Wertes der Waschflüssigkeit vor Eintritt in den Waschbehälter, eine Absenkung des pH-Wertes auf den für die Calciumnitritumwandlung erforderlichen Wert zwischen 4 und 5 nicht möglich sein sollte, erweist es sich als zweckmäßig, der Waschflüssigkeit über eine Leitung 14 zusätze ich Schwefelsäure zuzuführen.If so, for example due to insufficient sulfur oxide concentration in the exhaust gas or too high a pH value of the scrubbing liquid before entering the Wash tank, lowering the pH value to that for calcium nitrite conversion required value between 4 and 5 should not be possible, it turns out as appropriate, I add sulfuric acid to the washing liquid via a line 14 to feed.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19772752918 DE2752918A1 (en) | 1977-11-26 | 1977-11-26 | Removal of sulphur oxide and nitrogen oxide cpds. from waste gas - by scrubbing with aq. liquor, using urea or prim. amine to destroy nitrous acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19772752918 DE2752918A1 (en) | 1977-11-26 | 1977-11-26 | Removal of sulphur oxide and nitrogen oxide cpds. from waste gas - by scrubbing with aq. liquor, using urea or prim. amine to destroy nitrous acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE2752918A1 true DE2752918A1 (en) | 1979-05-31 |
Family
ID=6024745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19772752918 Pending DE2752918A1 (en) | 1977-11-26 | 1977-11-26 | Removal of sulphur oxide and nitrogen oxide cpds. from waste gas - by scrubbing with aq. liquor, using urea or prim. amine to destroy nitrous acid |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE2752918A1 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3001457A1 (en) * | 1980-01-14 | 1981-07-23 | Hans-Ulrich Dipl.-Chem. Kreusler | Nitrogen oxide removal from waste gas using aq. urea soln. - circulating in countercurrent through packed column, e.g. of polystyrene |
| WO1987002023A1 (en) * | 1985-10-04 | 1987-04-09 | Fuel Tech, Inc. | Reduction of nitrogen- and carbon-based pollutants |
| DE3603984A1 (en) * | 1986-02-08 | 1987-08-13 | Hoelter Heinz | Process for separating off nitrogen oxides from exhaust gases |
| US4751065A (en) * | 1985-12-20 | 1988-06-14 | Fuel Tech, Inc. | Reduction of nitrogen- and carbon-based pollutants |
| EP0314842A1 (en) * | 1987-11-03 | 1989-05-10 | Richard E. Thompson | Method and composition for utilizing lime-urea hydrates to simultaneously reduce NOx and SOx in combustion effluents |
| EP0373351A1 (en) * | 1988-11-15 | 1990-06-20 | Ente Nazionale Per L'energia Elettrica - (Enel) | A mixture for reducing pollutant materials in boiler flue gases |
| EP0476201A1 (en) * | 1990-09-17 | 1992-03-25 | Miriam S. Mozes | Process for controlling acid emissions in power plant flue gases |
| US9764281B2 (en) * | 2015-12-18 | 2017-09-19 | Cannon Technology, Inc. | Process for the removal of contaminants from flue gas streams |
-
1977
- 1977-11-26 DE DE19772752918 patent/DE2752918A1/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3001457A1 (en) * | 1980-01-14 | 1981-07-23 | Hans-Ulrich Dipl.-Chem. Kreusler | Nitrogen oxide removal from waste gas using aq. urea soln. - circulating in countercurrent through packed column, e.g. of polystyrene |
| WO1987002023A1 (en) * | 1985-10-04 | 1987-04-09 | Fuel Tech, Inc. | Reduction of nitrogen- and carbon-based pollutants |
| US4751065A (en) * | 1985-12-20 | 1988-06-14 | Fuel Tech, Inc. | Reduction of nitrogen- and carbon-based pollutants |
| DE3603984A1 (en) * | 1986-02-08 | 1987-08-13 | Hoelter Heinz | Process for separating off nitrogen oxides from exhaust gases |
| EP0314842A1 (en) * | 1987-11-03 | 1989-05-10 | Richard E. Thompson | Method and composition for utilizing lime-urea hydrates to simultaneously reduce NOx and SOx in combustion effluents |
| EP0373351A1 (en) * | 1988-11-15 | 1990-06-20 | Ente Nazionale Per L'energia Elettrica - (Enel) | A mixture for reducing pollutant materials in boiler flue gases |
| EP0476201A1 (en) * | 1990-09-17 | 1992-03-25 | Miriam S. Mozes | Process for controlling acid emissions in power plant flue gases |
| US9764281B2 (en) * | 2015-12-18 | 2017-09-19 | Cannon Technology, Inc. | Process for the removal of contaminants from flue gas streams |
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