Enhanced NO{sub x} removal in wet scrubbers using metal chelates. Final report, Volume 1

Smith, Kevin; Lani, B.; Berisko, D.; Schultz, C.E.; Carlson, W. S.; Benson, L.B.

doi:10.2172/48241

Cited by 11 publications

(14 citation statements)

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“…A 0.025 M ferroine solution was used as the redox indicator. To obtain reproducible results, the iron-chelate sample was diluted with an ∼10-fold volume of sulfuric acid (2 M) and degassed by adding ∼1 g of NaHCO 3 . After adding some drops of the ferroine indicator, the color of the solution turned red/orange.…”

Section: Determination Of the Concentration Of Fe II In Solutionmentioning

confidence: 99%

“…Particularly, Fe II chelates based on ethylenediaminetetraacetic acid derivates (EDTA) and related compounds such as NTA (nitrilotriacetic acid) are very effective and lead to high NO absorption rates and removal efficiencies. 2,3 However, to be cost effective, the Fe chelate needs to be regenerated and reused in the process. Various recycle options have been proposed.…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of the Reaction of Fe^II(EDTA) with Oxygen in Aqueous Solutions

Gambardella¹,

Ganzeveld

Winkelman³

et al. 2005

Ind. Eng. Chem. Res.

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The kinetics of the reaction of oxygen with aqueous Fe II (EDTA) solutions has been determined in a range of process conditions (C Fe II (EDTA) ) 15-60 mol/m 3 , P O2 ) 5-20 kPa, pH ) 5-8, T ) 298-328 K, C NaCl ) 0-15 kg/m 3 ) using a gas-liquid stirred cell reactor. The oxygen absorption rates were modeled using an expression derived by De Coursey using the penetration theory of mass transfer. Within the range of process conditions applied, the reaction was shown to be first order in oxygen and second order in iron chelate. The temperature dependence of the kinetic constant may be expressed as (pH ) 7, no salt addition): k 12 ) 5.3 × 10 3 e -4098/T m 6 /(mol 2 ‚s). The kinetic constant is essentially independent of the pH in the range 5 < pH < 8. When applying a NaCl concentration of 15 kg/m 3 , the kinetic constant increases ∼35% (T ) 328 K). The oxidation of Fe II (EDTA) to Fe III (EDTA) is not the sole oxygen-consuming reaction. The extent of side reactions, possibly related to EDTA ligand degradation, is a function of the pH and the oxygen concentration. A remarkable, unprecedented step change in the selectivity of the reaction was observed when the reaction was performed at a higher oxygen concentration.

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Section: Determination Of the Concentration Of Fe II In Solutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Kinetics of the Reaction of Fe^II(EDTA) with Oxygen in Aqueous Solutions

Gambardella¹,

Ganzeveld

Winkelman³

et al. 2005

Ind. Eng. Chem. Res.

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“…The addition of sulfite can chemically reduce Fe III EDTA back to Fe II EDTA at high temperatures, but at a high cost. 36 Heterogeneous electron transfer provides a less expensive method of reactivating Fe II EDTA. 57 The design of an effective industrial electrochemical cell is the key to this nonchemical regeneration of Fe II EDTA.…”

Section: ■ Resultsmentioning

confidence: 99%

“…Such a condition drives reactions 1 and 2 in a forward direction only. 36 Substituting eqs 7 and 8 into eq 5 gives the following: …”

Section: ■ Calculationsmentioning

confidence: 99%

On the Kinetics of the Absorption of Nitric Oxide into Ammoniacal Cobalt(II) Solutions

Tan²

2014

Environ. Sci. Technol.

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Experiments were conducted using a custom double-stirred tank reactor to determine the rate constants of reactions between nitric oxide (NO) and both pentaaminecobalt(II) and hexaaminecobalt(II) at temperatures of 298.2 and 303.2 K and pH levels between 8.50 and 9.87 under atmospheric pressure. The NO concentration of simulated flue gas stream ranged from 400 to 1400 ppmv. Ammoniacal cobalt(II) solutions were prepared by adding aqueous ammonia into a cobalt(II) nitrate solution in the presence of concentrated ammonium nitrate. The reaction rate constants were calculated with an enhancement factor for gas absorption associated with parallel chemical reactions. The results showed that the reaction between NO and pentaaminecobalt(II) was first order with respect to both the NO and the pentaamminecobalt(II) ion. Similarly, the reaction between NO and hexaamminecobalt(II) was first order with respect to both the NO and the hexaamminecobalt(II) ion. The forward reaction rate constants of these two reactions were 6.43 × 10(6) and 1.00 × 10(7) L · mol(-1) · s(-1) at 298.2 K, respectively, and increased to 7.57 × 10(6) and 1.12 × 10(7) L · mol(-1) · s(-1) at 303.2 K, respectively. Ammoniacal cobalt(II) solutions also have the potential to simultaneously remove CO2, SO2, and NOx from postcombustion flue gas.

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“…Wet removal techniques, e.g. reactive NO absorption in Fe II (EDTA) (EDTA = ethylenediaminetetraacetic acid) or Fe II (NTA) (NTA = nitrilotriacetic acid) solutions offers promising possibilities [2,3]. Of particular interest is the so called BiodeNOx process, which combines reactive absorption of NO in an iron-chelate solution (Eq.…”

Section: Introductionmentioning

confidence: 99%

Reactive NO absorption in aqueous FeII(EDTA) solutions in the presence of denitrifying micro-organisms

Gambardella

Sanchez

Ganzeveld

et al. 2006

Chemical Engineering Journal

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Reactive NO absorption in aqueous FeII(EDTA) solutions in the presence of denitrifying micro-organisms Gambardella, F.; Galán Sánchez, L.M.; Ganzeveld, K.J.; Winkelman, J.G.M.; Heeres, H.J. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. AbstractThe effect of the presence of denitrifying biomass on the reactive absorption of NO in aqueous Fe II (EDTA) solutions has been investigated (T = 303, 325 K, C Fe II (EDTA) = 30-35 mol/m 3 , C total solids = 0-7.5 kg/m 3 , C suspended solids = 0-1.2 kg/m 3 , C NO in = 250 vppm). The absorption rate of NO is affected by the presence of the biomass sludge and high sludge loadings resulted in reductions in the NO absorption rates. The decrease is likely due to partial blockage of the gas-liquid interface by inorganic and organic suspended solids and to a lesser extent to changes in the physical properties of the liquid. For one of the samples, an enhancement of the NO absorption rate was observed, presumably as a result of a shuttling effect due to the presence of small, adsorptive particles. A semi-empirical engineering model was developed based on the theory of mass transfer in combination with solid particles. The model includes both possible enhancement of mass transfer due to the presence of small adsorptive particles as well as reduction of the mass transfer rate due to the presence of particles adhering to the gas-liquid interface. The experimental profiles were modeled successfully using this approach.

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Enhanced NO{sub x} removal in wet scrubbers using metal chelates. Final report, Volume 1

Cited by 11 publications

References 0 publications

Kinetics of the Reaction of Fe^II(EDTA) with Oxygen in Aqueous Solutions

Kinetics of the Reaction of Fe^II(EDTA) with Oxygen in Aqueous Solutions

On the Kinetics of the Absorption of Nitric Oxide into Ammoniacal Cobalt(II) Solutions

Reactive NO absorption in aqueous FeII(EDTA) solutions in the presence of denitrifying micro-organisms

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Enhanced NO{sub x} removal in wet scrubbers using metal chelates. Final report, Volume 1

Cited by 11 publications

References 0 publications

Kinetics of the Reaction of FeII(EDTA) with Oxygen in Aqueous Solutions

Kinetics of the Reaction of FeII(EDTA) with Oxygen in Aqueous Solutions

On the Kinetics of the Absorption of Nitric Oxide into Ammoniacal Cobalt(II) Solutions

Reactive NO absorption in aqueous FeII(EDTA) solutions in the presence of denitrifying micro-organisms

Contact Info

Product

Resources

About

Kinetics of the Reaction of Fe^II(EDTA) with Oxygen in Aqueous Solutions

Kinetics of the Reaction of Fe^II(EDTA) with Oxygen in Aqueous Solutions