Mass transfer with chemical reaction and precipitation

Wachi, Shun; Jones, Alan G.

doi:10.1016/0009-2509(91)85095-f

Cited by 69 publications

(43 citation statements)

References 19 publications

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“…For the calculation of the mass balance of these reactions, we applied the film theory [40,41]: ), respectively; The population balance of the precipitated particles (CaCO 3 ) was described, assuming that the concentration of [CO 3 2-] is constant across the diffusion layer, by the following equation [42]:…”

Section: The Model and Simulation Resultsmentioning

confidence: 99%

Simulation, aggregation and thermal analysis of nanostructured calcite obtained in a controlled multiphase process

Wszelaka‐Rylik

Piotrowska

Gierycz

2014

J Therm Anal Calorim

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In the present experiments, the carbonation process in multiphase system was carried out using the reactor with rotating discs. Calcite was produced by controlled fast precipitation through gaseous CO 2 adsorption in Ca(OH) 2 slurry. Furthermore, the reaction kinetics' were controlled by disc's revolution speed in the range from 80 rpm through 120 to 160 rpm. Initial concentration of the slurry ranged between 54 and 110 mM L -1 . The aggregates of crystals precipitated in the aqueous solution were of sub-micrometric size. Dynamic light scattering method showed that mean aggregate diameter decreased with the higher mixing rate as long as the mixing condition was homogenous (up to 160 rpm). Thermogravimetric analysis revealed that the surface of calcite was polluted by unwanted, different compounds amount of which depends on the initial concentration of the slurry. Therefore, in order to obtain chemically pure calcite, CaCO 3 powder was heated up in the laboratory oven. In order to explain the mechanism of calcite particles' aggregation, the simulation of the aggregates formation has been performed based on the new model taking into account kinetics of the multiphase reaction, crystal growth and their agglomeration. The obtained data on crystal morphology during the precipitation process have been compared with the model simulation results. The internally consistent model very well describes both the formation and the aggregation of the calcite nanoparticles, and the same can be used and recommended for accurate calculations of the particle and aggregates' sizes as well as their distribution in the reactor.

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Section: The Model and Simulation Resultsmentioning

confidence: 99%

Simulation, aggregation and thermal analysis of nanostructured calcite obtained in a controlled multiphase process

Wszelaka‐Rylik

Piotrowska

Gierycz

2014

J Therm Anal Calorim

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“…& Jones, 2001) which used the method of moments, took into account only a nucleation growth. However, experiment in both gas-liquid (Wachi & Jones, 1991) and liquid-liquid (Tai & Chen, 1995, Collier & Hounslow, 1999) precipitation of CaCO 3 have evidenced the presence of agglomeration and demonstrated its importance in determining of the product crystal size distribution. The time-dependent population balance equation (Rigopoulos.…”

Section: Bubble Column Reactormentioning

confidence: 99%

“…The film theory (Wachi & Jones, 1991, Danckwerts, 1970 describes the mass balance of reactants in these reactions as follows: are diffusivity of (CO 2(g) ), (OH -) and (CO 3 2-), respectively. The component (CO 3 2-) is formed by reaction (48) and consumed by the precipitation reaction (49).…”

Section: Thin Film Reactormentioning

confidence: 99%

“…The equations can be rewritten to the following forms: (67) where: c Ca is the concentrations of (Ca 2+ ), K sp is solubility of the product (calcium carbonate). The corresponding mass based rate equations both of nucleation and growth can be expressed by the following equations (Wachi & Jones, 1991, Danckwerts, 1970:…”

Section: Thin Film Reactormentioning

confidence: 99%

“…Each model describing the crystal formation (i.e. Quigley & Roger, 2008, Tobias & Klein, 1996, Wachi & Jones, 1991 has to take into account both particulate crystal characteristics and fluid-particle transport processes. The crystals formation and further solid-liquid separation of particulate crystals from solution involves suspension and sedimentation.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Simulation of CaCO3 Crystal Growth in Multiphase Reaction

Gierycz¹

2012

Modern Aspects of Bulk Crystal and Thin Film Preparation

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Modeling Mass Transfer and Crystallization in Disperse Systems

Weiß

Hennig

Kümmel

et al. 2000

Chem. Eng. Technol.

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Disperse systems in which the crystallization process takes place within droplets of a defined diameter allow the formation of globule‐shaped crystals or agglomerates with narrow particle size distribution, provided that the mass transfer between individual emulsion droplets can be neglected. The crystallization can be initiated by evaporation of the solvent, by cooling, chemical reaction or addition of an antisolvent. For antisolvent crystallizations, a model has been developed in the present work.

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Mass transfer with chemical reaction and precipitation

Cited by 69 publications

References 19 publications

Simulation, aggregation and thermal analysis of nanostructured calcite obtained in a controlled multiphase process

Simulation, aggregation and thermal analysis of nanostructured calcite obtained in a controlled multiphase process

Simulation of CaCO3 Crystal Growth in Multiphase Reaction

Modeling Mass Transfer and Crystallization in Disperse Systems

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