Uncatalyzed heterogeneous oxidation of calcium bisulfite

Lancia, A.; Musmarra, Dino; Pepe, Francesco

doi:10.1016/0009-2509(96)00222-9

Cited by 38 publications

(41 citation statements)

References 22 publications

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“…On the basis of the results reported in the literature (4)(5)(6)(7)(8)(9)(11)(12), for a pH range of 7.5-9, low sulfite concentration and Co 2+ or Mn 2+ as catalyst, the following equation appears the most appropriate to describe the kinetics of the oxidation reaction where r is the reaction rate expressed as moles of SO4 2-produced per unit time and volume, k is the kinetic constant, cM the catalyst concentration, and cS(IV) the total sulfite concentration. However, the values found for the kinetic constant k are not at all consistent: in particular the reported values of k at 25°C range between 2 and 35 × 10 6 m 3 /mol s, while the activation energy ranges from 50 to 150 kJ/mol.…”

Section: Introductionmentioning

confidence: 99%

Calcium Bisulfite Oxidation Rate in the Wet Limestone−Gypsum Flue Gas Desulfurization Process

Lancia

Musmarra

1999

Environ. Sci. Technol.

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In this paper oxidation of calcium bisulfite in aqueous solutions was studied, in connection with the limestonegypsum flue gas desulfurization process. Experimental measurements of the oxidation rate were carried out in a laboratory scale stirred reactor with continuous feeding of both gas and liquid phase. A calcium bisulfite clear solution was used as liquid phase, and pure oxygen or mixtures of oxygen and nitrogen were used as gas phase. Experiments were carried out at T ) 45°C varying the composition of the liquid phase and the oxygen partial pressure. Manganous sulfate was used as catalyst. The analysis of the experimental results showed that the kinetics of bisulfite oxidation in the presence of MnSO 4 follow a parallel reaction mechanism, in which the overall reaction rate can be calculated as the sum between the uncatalyzed rate ( 3 / 2 order in bisulfite ion) and the catalyzed reaction rate (first order in manganous ion).

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Section: Introductionmentioning

confidence: 99%

Calcium Bisulfite Oxidation Rate in the Wet Limestone−Gypsum Flue Gas Desulfurization Process

Lancia

Musmarra

1999

Environ. Sci. Technol.

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“…With this relationship, the oxidation rate of S(IV) can be given by the mass transfer rate of O 2 in Eq. (3) (Lancia et al, 1996). Subsequently, this method can be used to get the mass transfer coefficient for O 2 (Wilkinson et al, 1993;Yoshida et al, 1960).…”

Section: Results For the Heterogeneous Oxidationmentioning

confidence: 99%

CO2 quality control through scrubbing in oxy-fuel combustion: Rate limitation due to S(IV) oxidation in sodium solutions in scrubbers and prior to waste disposal

Liu

Wall

Stanger

2015

International Journal of Greenhouse Gas Control

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“…Forced oxidation in the FGD scrubber loop improves the dewatering properties of the sludge, leading to the crystallization of gypsum (CaSO 4 ⅐ 2H 2 O), a byproduct with a lower adverse environmental impact than the solid mixture of CaSO 3 ⅐ [1/2]H 2 O and calcium sulfate (CaSO 4 ), which is usually produced. 1 The overall reactions occurring in the forced oxidation of calcium bisulfite include the following:…”

Section: Introductionmentioning

confidence: 99%

“…In these processes, forced oxidation in the scrubber loop improves the dewatering properties of the sludge, leading to the crystallization of gypsum (CaSO 4 ⅐ 2H 2 O), a byproduct with a lower adverse environmental impact than the solid mixture of CaSO 3 ⅐ [1/2]H 2 O and CaSO 4 , which is usually produced. 1 The oxidation reaction takes place in heterogeneous conditions (i.e., when a sulfurous solution is contacted with an oxygen containing gas phase). The occurrence of oxygen mass transfer accompanied by a chemical reaction gives rise to some interactions that make difficult the description and modeling of the phenomena taking place in the liquid phase.…”

Section: Introductionmentioning

confidence: 99%

Sulfite Oxidation Catalyzed by Cobalt Ions in Flue Gas Desulfurization Processes

Karatza

Prisciandaro

Lancia

et al. 2010

Journal of the Air & Waste Management Association

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This paper presents an experimental study of calcium bisulfite oxidation, a key step in the wet limestonegypsum flue gas desulfurization (FGD) process, in the presence of catalysts (e.g., cobalt ions and a mixture of ferrous and cobalt ions). A fundamental approach is followed, by reproducing a simplified synthetic FGD liquor in which both catalyst ions, alone or mixed together, are present. A laboratory-scale apparatus is used, in which sulfurous solution is contacted with a gas phase at a fixed oxygen partial pressure (21.3 kPa) and at different temperature levels (25, 45, and 55°C). The experimental results are analyzed using the theory of gas-liquid mass transfer with chemical reaction, showing that the slow reaction regime is explored and the transition from the kinetic to the diffusional subregime is identified. The experimental results are compared with those obtained in the presence of other catalytic species (manganese and ferrous ions), showing that cobalt is effective in catalyzing the oxidation of calcium bisulfite to sulfate, but to a minor extent with respect to iron and manganese.

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Uncatalyzed heterogeneous oxidation of calcium bisulfite

Cited by 38 publications

References 22 publications

Calcium Bisulfite Oxidation Rate in the Wet Limestone−Gypsum Flue Gas Desulfurization Process

Calcium Bisulfite Oxidation Rate in the Wet Limestone−Gypsum Flue Gas Desulfurization Process

CO2 quality control through scrubbing in oxy-fuel combustion: Rate limitation due to S(IV) oxidation in sodium solutions in scrubbers and prior to waste disposal

Sulfite Oxidation Catalyzed by Cobalt Ions in Flue Gas Desulfurization Processes

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