Crystallization Kinetics from MSMPR Crystallizers

Garside, J.; Shah, Mukund B.

doi:10.1021/i260076a001

Cited by 102 publications

(75 citation statements)

References 11 publications

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“…Most of authors showed that the contact secondary nucleation rate is proportional to a power of the volumetric hold-up of the crystals [12][13][14]. Moreover, when a stirrer rotates in a suspension, the nucleation is proportional to a power of the power provided by the stirrer to the suspension as well [6,15].…”

Section: Secondary Nucleation Rate Expressionmentioning

confidence: 99%

Influence of mixing and solid concentration on sodium bicarbonate secondary nucleation rate in stirred tank

Wylock¹,

Gutierrez

Debaste

et al. 2010

Cryst. Res. Technol.

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This work aims to investigate the influence of the solid concentration in suspension on the contact secondary nucleation rate of sodium bicarbonate crystallization in a stirred tank crystallizer and to show the necessity of a local description of the mixing for a nucleation rate influence study. Experiments and computational fluid dynamics (CFD) simulations are realized. Crystallization kinetic parameters are extracted from experimental data using a mass distribution fitting approach. CFD and the experimental results allow identifying that a mixing property correlated with the measurements of the secondary nucleation rate in the stirred tank crystallizer appears to be the turbulent dissipation rate on the edge of the impeller. Its influence and the influence of the solid concentration in the suspension on the secondary nucleation rate are estimated by the evaluation of their exponents in a kinetic law. The obtained exponent values are then discussed qualitatively.

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Section: Secondary Nucleation Rate Expressionmentioning

confidence: 99%

Influence of mixing and solid concentration on sodium bicarbonate secondary nucleation rate in stirred tank

Wylock¹,

Gutierrez

Debaste

et al. 2010

Cryst. Res. Technol.

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“…Therefore, downsizing and control of the size distribution of Li 2 CO 3 particles are very important during Li 2 CO 3 crystallization. Studies on the kinetics of the reactive crystallization of calcium carbonate and magnesium carbonate show that high supersaturation results in the crystallization of small particles, as the nucleation process is more sensitive to supersaturation than to crystal growth (Garside and Shah, 1980;Swinney et al, 1982). However, it is difficult to achieve high supersaturation during Li 2 CO 3 crystallization because the solubility product of Li 2 CO 3 at a specified temperature is almost 1,000 times that of calcium carbonate.…”

Section: Introductionmentioning

confidence: 99%

Reactive Crystallization of Lithium Carbonate Nanoparticles by Microwave Irradiation of Aqueous Solution Containing CO2 Microbubbles

Matsumoto

Morita

Yoshinaga

et al. 2009

J. Chem. Eng. Japan

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In this study, we used minute gas-liquid interfaces around CO 2 microbubbles activated by microwave irradiation as new reaction fields and developed a crystallization technique to produce lithium carbonate (Li 2 CO 3 ) nanoparticles. At the minute gas-liquid interfaces, nucleation occurs predominantly because of the formation of numerous local supersaturation regions at higher temperatures; hence, fine-sized Li 2 CO 3 particles with a narrow size distribution are crystallized, as the Li 2 CO 3 solubility decreases sharply with an increase in temperature. Microwaves (2.45 GHz) were used to irradiate an aqueous solution containing lithium ions and CO 2 microbubbles in a waveguide-type microwave apparatus. The heating method, rate of temperature increase (r T r T r T ) and average bubble size (d bbl d bbl d bbl ) were considered as the operation parameters and varied; the combined effects of CO 2 microbubble formation and microwave irradiation on the reactive crystallization of Li 2 CO 3 nanoparticles were examined. Consequently, during microwave irradiation of the solution containing CO 2 microbubbles, the crystallization of Li 2 CO 3 nanoparticles was significantly accelerated with an increase in r T r T r T and a decrease in

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“…Crystal growth and contact nucleation of soluble substances have been studied extensively. Important features of the system include the observation of size-dependent growth over a wide range of crystal sizes (Tai and Yu, 1989), the requirement of a critical crystal size about 195-225 prn for the generation of secondary nuclei (Cayey andEstrin, 1967 andRousseau et al, 1976) and more nuclei are produced at higher supersaturation and magma density (Garside and Shah, 1980). Similar studies of sparingly soluble salt are limited, because large single crystals are difficult to prepare.…”

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confidence: 99%

Size‐Dependent growth and contact nucleation of calcite crystals

1993

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The growth kinetics and contact nucleation of calcite crystals were studied in a pH-stat crystallizer. Large seed crystals up to 230 pm were successfully prepared by the gel growth technique. The crystal growth data over a wide range of crystal sizes were evaluated from titration curves by an initial slope method and then analyzed by the two-step model. The mass-transfer and surface integration rates were found to be functions of crystal size with the exception of mass-transfer rates of small crystals less than 10 pm. The controlling step of crystal growth process was tested using the effectiveness factor concept. Large seed crystals of calcite induced contact nucleation when a stainless-steel impeller was used for agitation. The important features of contact nucleation for calcite crystals were explored and compared with those of soluble substances.

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Crystallization Kinetics from MSMPR Crystallizers

Cited by 102 publications

References 11 publications

Influence of mixing and solid concentration on sodium bicarbonate secondary nucleation rate in stirred tank

Influence of mixing and solid concentration on sodium bicarbonate secondary nucleation rate in stirred tank

Reactive Crystallization of Lithium Carbonate Nanoparticles by Microwave Irradiation of Aqueous Solution Containing CO2 Microbubbles

Size‐Dependent growth and contact nucleation of calcite crystals

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