Sulfite Oxidation as a Measure of Aeration Effectiveness

Schultz, Jerome S.; Gaden, Elmer L.

doi:10.1021/ie50564a046

Cited by 63 publications

(35 citation statements)

References 6 publications

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“…In FGD plants, due to the lower pH, the prevailing sulfurous species is bisulfite ion HSO3 -instead of sulfite ion SO3 2-; besides, since calcium sulfite solubility is rather low, the concentrations involved in the reaction are lower than those taken into account by the researchers whose work is described above. However, the interpretation of the results relative to heterogeneous conditions is more complex, due to the interactions between chemical reactions and diffusive transport of reactants, products, and catalysts (21). Barron and co-workers (6,22) proposed an interpretation according to which, when the absorption rate is high, the overall reaction is controlled by the rate of production of the activated form of the catalyst, M (z+1)+ .…”

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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“…As a consequence, the unknown liquid mass transfer resistance (boundary layer) has no influence on the mass transfer rate (Danckwerts [1], Linek and Vacek [3]). The oxygen interphase concentration c * A,l is in equilibrium state with the gas bulk phase p A , as the gas phase resistance is negligible (Linek and Mayrhoferová [4], Schultz and Gaden [5]). The respective two-phase concentration profiles for oxygen transfer are shown in figure 3.…”

Section: Methodsmentioning

confidence: 99%

Chemical determination of oxygen transfer rates, transfer efficiencies and interphases evoked by aeration elements for liquid flows

Höfler¹,

Kneer²,

Gross³

et al. 2015

Computational Methods in Multiphase Flow VIII

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Aeration using bubble clusters is a central practice in biological and industrial process technology. The oxygen transfer capacity of state-of-the-art aeration elements was analysed by means of sulphite (S IV ) oxidation in liquid phase. Oxygen transfer rate, oxygen transfer efficiency and specific values for the size of the interphase were derived. Measurements were carried out in a pilot scale seawater flue gas desulphurisation plant, using an aeration basin equipped with a gas-tight cover. Aeration elements representing different types and materials were installed in the basin and fed with pressurised dried air. Liquid temperature and pH were controlled during experiments. 0.5 mol/l sulphite solution was used for the experiments, which were carried out at pH = 9 and T l = 22-25• C in presence of a cobalt catalyst. Under these conditions, the liquid phase mass transfer resistance was negligible, allowing the determination of the interphase. Elements were tested at rates of feed flowṁ air = 12, 18, 24 m 3 STP /h. The oxygen consumption due to oxidation of the sulphite, which is a direct measure of the transferred gas flux, was derived by means of two measurement methods: exhaust gas analysis and iodometry. While the results of both methods showed comparable trends, discrepancies in total mass transfer were found, which were attributed to the experimental setup. Results showed significant differences in characteristics of the tested aeration elements. Influences due to assembly regarding the orientation of an element inside an aeration basin were analysed for pipe aerators with doublesided perforation.

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“…After adjusting the liquid flow rate, the air flow to the reactor was started at a preset value. The gas-liquid dispersion achieved the hydrodynamic steady-state conditions (visually a steady flow pattern and steady holdup) in less than 15 s. When the steady-state conditions were established, the aqueous solution samples were taken by a syringe and immediately analyzed for sodium sulfite concentration by standard iodometric titration [33]. The absorption rate of oxygen was determined from the depletion of sulfite concentration over a period.…”

Section: Methodsmentioning

confidence: 99%

Effects of Contaminants on the Mass‐Transfer Characteristics of a Two‐Impinging‐Streams Gas‐Liquid Reactor

Dehkordi

Savari

2011

Chem Eng & Technol

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The mass-transfer characteristics of a new type of two-impinging-streams reactor (TISR) was studied by means of sodium sulfite solution as the liquid phase and air as the gas phase, in the presence and absence of various types of surface-active agents (SAAs). The influences of anionic, cationic, and nonionic SAAs on the specific interfacial area and overall volumetric mass-transfer coefficient obtained in the TISR were investigated. It was found that the presence of a little amount of the above-mentioned contaminants increases the specific interfacial area and decreases the overall volumetric mass-transfer coefficient. On the basis of the experimental results obtained for various types of SAAs, correlations were derived for the interfacial area as well as the Sherwood number for the liquid phase in terms of Froude, Reynolds, Schmidt, and Morton numbers.

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Sulfite Oxidation as a Measure of Aeration Effectiveness

Cited by 63 publications

References 6 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

Chemical determination of oxygen transfer rates, transfer efficiencies and interphases evoked by aeration elements for liquid flows

Effects of Contaminants on the Mass‐Transfer Characteristics of a Two‐Impinging‐Streams Gas‐Liquid Reactor

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