Revisiting the dissolution kinetics of limestone - experimental analysis and modeling

Carletti, Claudio; Grénman, Henrik; Blasio, Cataldo De; Mäkilä, Ermei; Salonen, Jarno; Murzin, Dmitry Yu.; Salmi, Tapio; Westerlund, Tapio

doi:10.1002/jctb.4750

Cited by 12 publications

(35 citation statements)

References 53 publications

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“…The metamorphic limestone tested had a higher degree of crystals and a much less porous surface. In fact, our previous investigations on this kind of sample [30] demonstrated that the sedimentary limestone had around ten times more surface in comparison with the metamorphic one. However, it is also demonstrated that the effective surface actually used during the reactions can be very different because of surface-liquid interactions such as zeta potential [31,32] and surface tension [20,33,34].…”

Section: Limestone Analysismentioning

confidence: 75%

Modeling of Limestone Dissolution for Flue Gas Desulfurization with Novel Implications

et al. 2020

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Solid-liquid dissolution is a central step in many industrial applications such as pharmaceutical, process engineering, and pollution control. Accurate mathematical models are proposed to improve reactor design and process operations. Analytical methods are significantly beneficial in the case of iterative methods used within experimental investigations. In the present study, a detailed analytical solution for the general case of solid particles dissolving in multiphase chemical reaction systems is presented. In this model, the authors consider a formulation that considers the particles’ shape factor. The general case presented could be utilized within different problems of multiphase flows. These methods could be extended to different cases within the chemical engineering area. Examples are illustrated here in relation to limestone dissolution taking place within the Wet Flue Gas Desulfurization process, where calcium carbonate is dissolving in an acidic environment. The method is the most common used technology to abate SO2 released by fuel combustion. Limestone dissolution plays a major role in the process. Nevertheless, there is a need for improvements in the optimization of the WFGD process for scale-up purposes. The mathematical model has been tested by comparison with experimental data from several mild acidic dissolution assays of sedimentary and metamorphic limestone. We have found that R2 ⊂ 0.92 ± 0.06 from dozens of experiments. This fact verifies the model qualifications in capturing the main drivers of the system.

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Section: Limestone Analysismentioning

confidence: 75%

Modeling of Limestone Dissolution for Flue Gas Desulfurization with Novel Implications

et al. 2020

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“…This could imply that the limestone could be ground to a larger size fraction than usual and exploit the ultrasound enhancement to reduce the energy consumption of the griding process. The two samples investigated in this study have very large differences in terms of structure, age, and composition [9,40]. This reflects on the degree of crystallinity of the samples and in terms of the solid surface.…”

Section: Effects Of Ultrasound On Specific Surface Area Determinationmentioning

confidence: 94%

“…Both samples are considered to be non-porous since the pore volume values measured by means of nitrogen adsorption were equal or less than 0.002 m 3 /g for both samples [9]. The mineral phases of the samples were assessed by X-ray diffraction (XRD) in previous works [39,40]. The samples were crushed using a jaw crusher; after this, the obtained powder was ground by means of a vibratory disc mill and sieved diverse times to the wanted size range.…”

Section: Methodsmentioning

confidence: 99%

“…activation energies found in the literature [40,51]. It has been reported that the double layer formed around the particles has a direct effect on mass transfer [52].…”

Section: Effect Of Surface Interactions On Limestone Dissolutionmentioning

confidence: 96%

“…Thus, an electrical double layer may be formed around the particles, and its effect on limestone dissolution may be dependent on pH. Such a double layer may hinder the hydronium ions approaching the limestone surface which could be the cause for the relatively low activation energies found in the literature [40,51]. It has been reported that the double layer formed around the particles has a direct effect on mass transfer [52].…”

Section: Effect Of Surface Interactions On Limestone Dissolutionmentioning

confidence: 99%

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Ultrasonic Power to Enhance Limestone Dissolution in the Wet Flue Gas Desulfurization Process. Modeling and Results from Stepwise Titration Experiments

et al. 2018

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The goal of this work is to assess the application of ultrasonic power to the reactive dissolution of limestone particles in an acidic environment; this would represent a novel method for improving wet Flue Gas Desulfurization industrial systems. In this study a stepwise titration method is utilized; experiments were done by using different particle size distributions with and without the application of ultrasound. The use of ultrasonic power sensibly affected the reaction rate of limestone and its dissolution; a major difference could be observed when samples from the Wolica region in Poland were studied. In this case, the overall dissolution rate was found to increase by more than 70%. The reactive dissolution of limestone does not follow the same mathematical model when sonication is in effect; in this case, an extra Ultrasonic Enhancement Constant was introduced. It was demonstrated that the dissolution is proportional to an Effective Reaction Surface and, therefore, surface interactions should also be taken into consideration. For this purpose, a study is presented here on the Z-potential and electrophoretic mobility of limestone samples measured in aqueous dispersions by means of Laser Doppler Micro-Electrophoresis.

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Absorption

Karayiannis

Laso

2018

Kirk-Othmer Encyclopedia of Chemical Technology

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Absorption, or gas absorption, is a unit operation used in the chemical industry to separate gases by washing or scrubbing a gas mixture with a suitable liquid. One or more of the gas components dissolves or is absorbed in the liquid and is thus removed from the mixture. Absorption is currently one of the most important processes in chemical engineering not only for product recovery but also, and perhaps mainly, for pollutant removal. Intense industrial and academic effort is focused on optimizing the process, in terms process efficiency as well as commercial aspects. In this article, the fundamental principles of gas solubility and mass transfer, design and operation of industrial equipment with relevant examples of typical commercial gas absorption processes are discussed, including recent developments in these areas.

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Revisiting the dissolution kinetics of limestone - experimental analysis and modeling

Abstract: BACKGROUND: Stricter SO 2 emission regulations for power plants and maritime transport encourage a better understanding of the phenomena involved in wet flue gas desulfurization (WFGD) where limestone dissolution is regarded as one of the rate determining steps.

Cited by 12 publications

References 53 publications

Modeling of Limestone Dissolution for Flue Gas Desulfurization with Novel Implications

Modeling of Limestone Dissolution for Flue Gas Desulfurization with Novel Implications

Ultrasonic Power to Enhance Limestone Dissolution in the Wet Flue Gas Desulfurization Process. Modeling and Results from Stepwise Titration Experiments

Absorption

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