Catalytic oxidation of calcium bisulfite in the wet limestone–gypsum flue gas desulfurization process

Lancia, A.; Musmarra, Dino; Prisciandaro, Marina; Tammaro, Marco

doi:10.1016/s0009-2509(98)00483-7

Cited by 43 publications

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“…To determine the effect of some process parameters on the oxidation reaction, particularly of catalyst concentration, three sets of experiments were performed with a fixed p O2 of 21.3 kPa because a previous experiment using Mn 2ϩ as a catalyst showed that p O2 variations have no influence, 9 and preliminary tests showed that in the presence of Co 2ϩ this zero-order dependence still exists. The first set of experiments was carried out to study the reaction rate as a function of HSO 3 Ϫ concentration at the temperature of 45°C and a fixed Co 2ϩ concentration ͑c Co 2ϩ ϭ 1 mol m Ϫ3 ).…”

Section: Resultsmentioning

confidence: 99%

“…Experiments were performed with a fixed p O2 of 21.3 kPa because a previous experiment using Mn 2ϩ as a catalyst has shown that p O2 variations have no effect on the SO 3 2Ϫ oxidation reaction rate. 9 The oxidation rate at steady state was evaluated by measuring the total SO 4 2Ϫ concentration in the inlet and outlet liquid streams; specifically, total SO 4 2Ϫ concentration was measured by means of a turbidimeter (Hach DR/2010) set at a wavelength of 450 nm. Furthermore, in both streams the concentration of total sulfite and Ca 2ϩ was measured.…”

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confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

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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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“…(10)(11)(12)(13)(14) were solved simultaneously and the concentrations at the gas-liquid interface were then calculated and are shown in Tab. 3.…”

Section: )mentioning

confidence: 99%

Comparison of Concentration Profiles for Boundary Layers in Absorption with Chemical Reaction Processes

Hace

2006

Chem Eng & Technol

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An analysis of five different systems of absorption-with-chemical-reaction in gas-liquid reactors, commonly encountered in various industrial processes, is presented. To analyze the interphase mass transfer from gas to liquid, the rate limiting parameters and the concentrations at the gas-liquid interface were determined on the basis of pertinent theories. The calculations presented, are based on the Whitman theory for gas and liquid phase mass transfer coefficients and Henry equilibrium constants. The necessary diffusion coefficients were calculated from existing correlations, and the corresponding chemical reaction rate constants were obtained from the literature, assuming pseudo first order chemical reaction. The process parameters required (pressure, temperature, and the gas-liquid contact time) were within the values that occur in industrial processes. The results presented, are the concentration profiles in the boundary layers for the systems studied, calculated and graphically presented, together with the gas and liquid film thicknesses and Hatta numbers, obtained from calculations for the liquid phase mass transfer. The results may contribute to a better understanding of the absorption-with-chemical-reaction processes in industrial plants, thus lowering the operational costs of these processes and alleviating the ecological problems of existing technologies.

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“…The dissolved S(IV) is then neutralized by an additive, most commonly lime or limestone [1]. In the aqueous phase different species of S(IV) (sulfur of oxidation state IV), are formed: hydrated sulfur dioxide (SO 2´H2 O), bisulfite (HSO 3 ± ) and sulfite (SO 3 2± ).…”

Section: Reaction Systemmentioning

confidence: 99%

“…The primary function of white pigments is that of covering, or ªhidingº, the substrate, and lightening color hues. Innovative, more fine-particled titanium dioxide pigments (nanorutiles) have, it is true, a lower ªhiding powerº, but possess additionally a color-shifting effect, which results from residual scatter in the blue portion of the spectrum [1]. Pigments are therefore unsuitable for the production of translucent materials due to their high hiding power, nanopigments due to their low and selective scatter of blue light.…”

Section: Fundamentalsmentioning

confidence: 99%

Experimental Investigation and Modeling of Catalytically Supported Sulfite/Bisulfite Oxidation with Oxygen

Kracker-Semler¹,

Marr

Siebenhofer

2004

Chem Eng & Technol

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Catalytic oxidation of calcium bisulfite in the wet limestone–gypsum flue gas desulfurization process

Cited by 43 publications

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Sulfite Oxidation Catalyzed by Cobalt Ions in Flue Gas Desulfurization Processes

Sulfite Oxidation Catalyzed by Cobalt Ions in Flue Gas Desulfurization Processes

Comparison of Concentration Profiles for Boundary Layers in Absorption with Chemical Reaction Processes

Experimental Investigation and Modeling of Catalytically Supported Sulfite/Bisulfite Oxidation with Oxygen

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