Invited Review Absorption of Nox Gases

Joshi, J. B.; Mahajani, Vijaykumar V.; Juvekar, Vinay A.

doi:10.1080/00986448508911161

Cited by 125 publications

(163 citation statements)

References 100 publications

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“…The nitrogen dioxide was previously considered to be highly soluble in water [5], which was proven to be a mistake. In fact, NO 2 solubility is low (0.3÷0.5 g/l for p NO2 = 0.1 MPa), which is only one order higher than the solubility of NO [10]. The absorbed NO 2 reacts with water producing nitrous and nitric acid [18]:…”

Section: Mechanism Of No Oxidation By Ozonementioning

confidence: 98%

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Pilot Plant Studies on Nox Removal Via No Ozonation and Absorption

Kordylewski¹,

Jakubiak²,

Hardy³

2013

Archives of Environmental Protection

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Abstract:The results of experimental investigations on the removal of NO x from gases applying ozone as the oxidizing agent and the absorption of higher nitrogen oxides in the sodium hydroxide solutions are presented. The experiment was conducted using a pilot plant installation with the air fl ow rate 200 m 3 /h, being a prototype of a boiler fl ue gas duct and a FGD scrubber. It was shown that in the range of [NO ref ] = 50 ÷ 250 ppm the mechanism of NO ozonation depends on the molar ratio X = O 3 /NO ref : for X ≤ 1.0 oxidation of NO to NO 2 predominates and NO 2 is poorly absorbed, for X >> 1.0 NO 2 undergoes further oxidation to N 2 O 5 , which is effi ciently absorbed in the scrubber. The stoichiometric molar ratio of complete conversion of NO into N 2 O 5 is X = 1.5, in these studies to reach the effectiveness η ≥ 90% the molar ratio X was much higher (2.75).

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Section: Mechanism Of No Oxidation By Ozonementioning

confidence: 98%

“…It is generally accepted that NO has a very low solubility [10]. The nitrogen dioxide was previously considered to be highly soluble in water [5], which was proven to be a mistake.…”

Section: Mechanism Of No Oxidation By Ozonementioning

confidence: 99%

Pilot Plant Studies on Nox Removal Via No Ozonation and Absorption

Kordylewski¹,

Jakubiak²,

Hardy³

2013

Archives of Environmental Protection

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“…For O3/NO ≈ 1 the main nitrogenous component of flue gas after ozonation remains NO2, because the reaction (1) is fast (Skalska et al, 2011) and the product of reaction (2) N2O3 is unstable. However, the role of N2O3 in the absorber cannot be overestimated, because N2O3 is well-soluble, while NO and NO2 are only weakly-soluble (Sander, 1999 (9) However, the efficiency NOx capture in this way (8, 9) from flue gas is limited to about 60% due to the reactions of disproportionation of nitrous acid with release of NO (Joshi et al, 1985) (11) Further increasing the molar ratio O3/NO > 1 results in oxidation of NO2 to NO3 in reaction (3), which combined with NO2 gives a very well-soluble dinitrogen pentoxide (N2O5) (Wang et al, 2015). In a solution N2O5 is converted into stable nitrate ions NO 3 − .…”

Section: The Mechanisms Of Chemical Reactions Of Nox and So2 With Ozonementioning

confidence: 99%

Influence of Oxidizing Reactor on Flue Gas Denitrification by Ozonation and Possibility of by-Product Separation

Kordylewski

Hałat

Łuszkiewicz

2017

Chemical and Process Engineering

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Results of laboratory scale research have been presented on the effects of an oxidizing reactor on ozone consumption and by-producs composition and separation of simultaneous NOx and SO2 removal from a carrier gas by ozonation method and absorption in an alkaline solution. The additional Dreschel washer added before two washers containing 100 ml of 0.1 molar NaOH solution played the role of an oxidation reactor. Its effect was investigated using an empty (dry or wetted) or filled with packing elements washer. The measured by-products in a scrubber and in the oxidizing reactor were SO3 2-, SO4 2-, NO2 -and NO3 -ions, respectively. It has been shown that use of oxidizing reactor improves NOx removal efficiency reducing ozone consumption. Wetting of the oxidation reactor with water enables a preliminary separation of sulphur and nitrogen species between the oxidizing reactor and an alkaline absorber. Application of packing elements in the oxidizing reactor allows to retain 90% of nitrogen compounds in it. Some results were confirmed by tests in pilot scale.

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“…Nitric oxide is only sparingly soluble and nonreactive in water. Reaction with NO 2 is not neglected in this model as this is significant at low partial pressure, according to Joshi [5]. Other equilibrium relations, such as with HNO 3 , are acknowledged but at levels that were considered insignificant for inclusion in our model.…”

Section: Chemistry Of Nitrogen Oxides Absorptionmentioning

confidence: 99%

“…The most commonly used rate constant k 1 and equilibrium constants K 2 and K 3 are reported by Joshi [5]. Hatta numbers greater than 3 were obtained for the absorption of NO 2 , N 2 O 3 * and N 2 O 4 and led to the overall kinetic parameters OKP j and the liquidphase mass-transfer rates R j expressed in Tab.…”

Section: Modeling Of the Nitrogen Absorption Into Alkaline Solutionsmentioning

confidence: 99%

Nitrogen Oxides Scrubbing with Alkaline Solutions

Thomas

Vanderschuren²

2000

Chem. Eng. Technol.

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The absorption of NOx into sodium hydroxide solutions was studied in a small packed column. A simple mathematical model developed for this absorption was used for the determination of rate parameters relative to NOx species in such solutions. While hydrolysis is the main controlling step for NO 2 , N 2 O 4 and N 2 O 3 species, nitrous acid HNO 2 plays an essential role for the NOx absorption in NaOH solutions. Our mechanistic and kinetic findings were validated as the model has worked with fair success in predicting both NOx removal efficiencies and liquid phase compositions.

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Invited Review Absorption of Nox Gases

Cited by 125 publications

References 100 publications

Pilot Plant Studies on Nox Removal Via No Ozonation and Absorption

Pilot Plant Studies on Nox Removal Via No Ozonation and Absorption

Influence of Oxidizing Reactor on Flue Gas Denitrification by Ozonation and Possibility of by-Product Separation

Nitrogen Oxides Scrubbing with Alkaline Solutions

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