SE441060B - METHOD OF DISPOSAL OF NITROUS GASES BY ABSORPTION IN SALPETIC ACID - Google Patents
METHOD OF DISPOSAL OF NITROUS GASES BY ABSORPTION IN SALPETIC ACIDInfo
- Publication number
- SE441060B SE441060B SE8206459A SE8206459A SE441060B SE 441060 B SE441060 B SE 441060B SE 8206459 A SE8206459 A SE 8206459A SE 8206459 A SE8206459 A SE 8206459A SE 441060 B SE441060 B SE 441060B
- Authority
- SE
- Sweden
- Prior art keywords
- nitrous gases
- absorption
- nitric acid
- disposal
- gases
- Prior art date
Links
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
-
- 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)
- Gas Separation By Absorption (AREA)
Description
8206459-3 2 blandningarna av nitriter och nitrater måste upparbetas före en vidareanvändning. 8206459-3 2 the mixtures of nitrites and nitrates must be worked up before a re-use.
Absorptionen av nitrösa gaser i salpetersyra under tillsats av oxidationsmedel, såsom väteperoxid eller ozon, ger en vidareanvändbar produkt i form av koncentrerad salpetersyra, men är på grund av höga kostnader icke alltid ekonomiska.The absorption of nitrous gases in nitric acid during addition of oxidizing agents, such as hydrogen peroxide or ozone, gives a reusable product in the form of concentrated nitric acid, but is not always economical due to high costs.
Olika reversibla absorptions- och adsorptionsförfaranden, exempelvis i tungmetallsaltlösningar eller på molekylsilar, medför endast en koncentrering av de i en gasström före- fintliga nitrösa gaserna, men bortskaffar icke dessa slut- giltigt.Various reversible absorption and adsorption processes, for example in heavy metal salt solutions or on molecular sieves, entails only a concentration of those present in a gas stream fine nitrous gases, but do not dispose of these final valid.
Det är även känt att reducera nitrösa gaser med stökiometris- ka mängder av väte eller ammoniak enligt N0+H2-4N2+H2O resp. 6NO2+8NH3--§7N2+l2H20. Dessa reaktioner genomföres vid för- höjd temperatur pâ katalysatorer. De medför höga energi- kostnader för upphettningen av kalla avgaser och dessutom är katalysatorerna känsliga för förgiftning genom i avgaserna från exempelvis metallbetsningsanläggningar förefintliga tungmetallspår.It is also known to reduce nitrous gases with stoichiometric gases. amounts of hydrogen or ammonia according to NO + H2-4N2 + H2O resp. 6NO2 + 8NH3 - §7N2 + l2H20. These reactions are carried out at elevated temperature of catalysts. They cause high energy costs for the heating of cold exhaust gases and in addition are the catalysts susceptible to poisoning through in the exhaust gases from, for example, metal pickling plants existing heavy metal tracks.
Uppgiften för föreliggande uppfinning har sålunda varit att åstadkomma ett förfarande för avlägsnande av nitrösa gaser ur gasblandningar genom absorption i salpetersyra, vilket gör det möjligt att även avlägsna nitrösa gaser, som föreligger i olika totalkoncentrationer och i varierande förhållanden NO till N02, utan att medföra höga anläggnings- eller energi- kostnader och utan att förbruka kemikalier.The object of the present invention has thus been that provide a process for removing nitrous gases from gas mixtures by absorption in nitric acid, which makes it is possible to also remove nitrous gases, which are present in different total concentrations and in varying conditions NO to N02, without causing high plant or energy costs and without consuming chemicals.
Denna uppgift löstes enligt uppfinningen genom att salpeter- syran innehåller en fosforsyraester. Företrädesvis användes såsom fosforsyraester tributylfosfat.This object was solved according to the invention by the acid contains a phosphoric acid ester. Preferably used such as phosphoric acid ester tributyl phosphate.
Det väsentliga framsteget genom förfarandet enligt uppfin- ningen beror på, att för de båda gasbeståndsdelarna NO och N02 med olika lösningsförhållanden användes tvâ olika absorptions- 8206459-3» 3 medier. NO löses lätt i HN03, däremot icke i tributylfosfat, under det att N02 löser sig dåligt i HN03 men mycket väl i tributylfosfat och andra fosforsyraestrar.The substantial progress of the process according to the invention This is due to the fact that for the two gas constituents NO and NO 2 with different solution conditions, two different absorption 8206459-3 » 3 media. NO is easily dissolved in HNO 3, but not in tributyl phosphate, while N02 dissolves poorly in HN03 but very well in tributyl phosphate and other phosphoric acid esters.
Förfarandet genomföras med fördel på sådant sätt, att den gasström, som skall renas, bringas i kontakt i en motströms- kolonn med en blandning av exempelvis 30 volymprocent HN03 och 70 volymprocent tributylfosfat. Salpetersyrablandningar med 50 till 90 volymprocent fosforsyraester har visat sig lämpliga, varvid i stället för tributylfosfat exempelvis även tripentylfosfat, tripropylfosfat eller tris-(2-etylhexyl)- -fosfat kan användas.The procedure is advantageously carried out in such a way that it gas stream to be purified is brought into contact in a countercurrent column with a mixture of, for example, 30% by volume of HNO 3 and 70% by volume of tributyl phosphate. Nitric acid mixtures with 50 to 90 volume percent phosphoric acid ester has been found suitable, where instead of tributyl phosphate for example also tripentyl phosphate, tripropyl phosphate or tris- (2-ethylhexyl) - -phosphate can be used.
Eftersom avsevärda mängder HN03 löser sig i tributylfosfat, exempelvis 15 volymprocent vid 65%-ig HNO3, och absorptionen av nitrösa gaser även äger rum i sådana lösningar, är det icke nödvändigt att vidta särskilda åtgärder för upprätthål- lande av definierade HN03 : tributylfosfat-förhållanden.Since significant amounts of HNO 3 dissolve in tributyl phosphate, for example 15% by volume at 65% HNO 3, and the absorption of nitrous gases also takes place in such solutions, it is it is not necessary to take special measures to maintain defined HNO3: tributyl phosphate ratios.
Företrädesvis innehåller salpetersyran 10 till 65 viktprocent HN03, i synnerhet 40 viktprocent.Preferably the nitric acid contains 10 to 65% by weight HNO3, in particular 40% by weight.
Det med nitrösa gaser bemängda absorptionsmedlet av salpeter- syra och fosforsyraester föres i en kolonnsump och oxideras i denna med det i gasströmmen förefintliga och/eller i absorp- tionsmedlet lösta syret till salpetersyra.The nitrous oxide-laden absorbent of nitric oxide acid and phosphoric acid ester are passed into a column sump and oxidized in this with that present in the gas stream and / or in the absorber. dissolved the oxygen to nitric acid.
För förekomst av höga koncentrationer av nitrösa gaser i gas- strömmen räcker eventuellt icke det lösta luftsyret till för oxidationen. Man kan i sådant fall införa ytterligare oxida- tionsluft i sumpen. Efter en fasseparering avtappas den bildade salpetersyran och tillföres till absorptionsmudlct motsvarande mängd vatten.For the presence of high concentrations of nitrous gases in the gas the current may not be enough for the dissolved atmospheric oxygen the oxidation. In such a case, additional oxidation tion air in the swamp. After a phase separation, it is drained formed nitric acid and added to absorption mudlct corresponding amount of water.
Förfarandets verksamhet beskrives närmare med två exempel.The operation of the procedure is described in more detail with two examples.
Eåempel 1.Example 1.
Genom en fyllkroppskolonn ledes luft med en halt av 10.000 ppm 8206459-3 4 nitrösa gaser och bringas i motström i kontakt med en bland- ning av 40%-ig salpetersyra med 80 volymprocent tributyl- fosfat.Air with a content of 10,000 ppm is passed through a filler column 8206459-3 4 nitrous gases and brought into countercurrent contact with a mixed 40% nitric acid with 80% by volume of tributyl- phosphate.
Vid kolonnens topp kan fortfarande 1100 ppm nitrösa gaser påvisas och verkningsgraden uppgår sålunda till 8% ä.At the top of the column can still be 1100 ppm nitrous gases is detected and the efficiency thus amounts to 8% ä.
Exempel 2.Example 2.
% N02 och 4,4 % NO i luft ledes genom en apparat enligt exempel l och i kolonnsumpen införes ytterligare luft. Vid kolonnens utlopp kan endast 0,4 % N02 och 0,6 % NO påvisas, vilket motsvarar en total verkningsgrad av 97,1.% NO 2 and 4.4% NO in air are passed through an apparatus according to Example 1 and additional air is introduced into the column sump. At the outlet of the column can be detected only 0.4% NO2 and 0.6% NO, which corresponds to a total efficiency of 97.1.
Med ett flertal efter varandra inkopplade absorptionsanlägg- ningar kan reningsverkan höjas ytterligare.With a plurality of absorption systems connected in series the purification effect can be further increased.
Claims (4)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3145331A DE3145331C1 (en) | 1981-11-14 | 1981-11-14 | A process for removing nitrous gases from gas mixtures |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| SE8206459D0 SE8206459D0 (en) | 1982-11-12 |
| SE8206459L SE8206459L (en) | 1983-05-15 |
| SE441060B true SE441060B (en) | 1985-09-09 |
Family
ID=6146440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE8206459A SE441060B (en) | 1981-11-14 | 1982-11-12 | METHOD OF DISPOSAL OF NITROUS GASES BY ABSORPTION IN SALPETIC ACID |
Country Status (3)
| Country | Link |
|---|---|
| CH (1) | CH658407A5 (en) |
| DE (1) | DE3145331C1 (en) |
| SE (1) | SE441060B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109647146A (en) * | 2019-01-23 | 2019-04-19 | 华能国际电力股份有限公司 | A kind of system and method for Industrial Boiler flue gas desulfurization and denitrification |
| CN111644048B (en) * | 2019-09-09 | 2022-01-21 | 上海浦景化工技术股份有限公司 | Process method for removing nitrogen oxide and alkyl nitrite gas in tail gas |
-
1981
- 1981-11-14 DE DE3145331A patent/DE3145331C1/en not_active Expired
-
1982
- 1982-11-12 SE SE8206459A patent/SE441060B/en not_active IP Right Cessation
- 1982-11-12 CH CH6616/82A patent/CH658407A5/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE3145331C1 (en) | 1983-06-09 |
| CH658407A5 (en) | 1986-11-14 |
| SE8206459D0 (en) | 1982-11-12 |
| SE8206459L (en) | 1983-05-15 |
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| NUG | Patent has lapsed |
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