Growth of the calcium carbonate polymorph vaterite in mixtures of water and ethylene glycol at conditions of gas processing

Flaten, Ellen Marie; Seiersten, Marion; Andreassen, Jens‐Petter

doi:10.1016/j.jcrysgro.2010.01.015

Cited by 42 publications

(33 citation statements)

References 14 publications

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“…The relationship between the growth rates and supersaturation is used to indicate the growth mechanisms. 36,37 Previous assessments of deposition rate [38][39][40][41] were based on initial rate constant and initial SR because of the decrease in concentration of ions with time, whereas, in the field, it is likely that a surface is exposed to the same condition for a fairly long time. Euvrard et al 42 observed a lateral growth rate of CaCO3 which decreases as the degree of supersaturation ratio decreases.…”

Section: Surface Growth Rate At Constant Saturation Ratiomentioning

confidence: 99%

“…In other studies, growth rates with a linear dependency on the SR were obtained at higher SR with high growth rates controlled by the diffusion and adhesion of particles from the bulk solution. 36 The rate is controlled by the transport of the ions in the bulk solution or by the adsorption process. However, the model in this study fits the exponential growth rate which describes a crystallization mechanism involving a surface nucleation determining step.…”

Section: Surface Growth Rate At Constant Saturation Ratiomentioning

confidence: 99%

“…However, the model in this study fits the exponential growth rate which describes a crystallization mechanism involving a surface nucleation determining step. 36 The plot of the rate of growth as a function of the logarithm of the relative supersaturation is shown in Fig. 15.…”

Section: Surface Growth Rate At Constant Saturation Ratiomentioning

confidence: 99%

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Development of a novel once-through flow visualization technique for kinetic study of bulk and surface scaling

Sanni

Bukuaghangin

Huggan

et al. 2017

Review of Scientific Instruments

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There is a considerable interest to investigate surface crystallization in order to have a full mechanistic understanding of how layers of sparingly soluble salts (scale) build on component surfaces. Despite much recent attention, a suitable methodology to improve on the understanding of the precipitation/deposition systems to enable the construction of an accurate surface deposition kinetic model is still needed. In this work, an experimental flow rig and associated methodology to study mineral scale deposition is developed. The once-through flow rig allows us to follow mineral scale precipitation and surface deposition in situ and in real time. The rig enables us to assess the effects of various parameters such as brine chemistry and scaling indices, temperature, flow rates, and scale inhibitor concentrations on scaling kinetics. Calcium carbonate (CaCO3) scaling at different values of the saturation ratio (SR) is evaluated using image analysis procedures that enable the assessment of surface coverage, nucleation, and growth of the particles with time. The result for turbidity values measured in the flow cell is zero for all the SR considered. The residence time from the mixing point to the sample is shorter than the induction time for bulk precipitation; therefore, there are no crystals in the bulk solution as the flow passes through the sample. The study shows that surface scaling is not always a result of pre-precipitated crystals in the bulk solution. The technique enables both precipitation and surface deposition of scale to be decoupled and for the surface deposition process to be studied in real time and assessed under constant condition.

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Section: Surface Growth Rate At Constant Saturation Ratiomentioning

confidence: 99%

Section: Surface Growth Rate At Constant Saturation Ratiomentioning

confidence: 99%

See 1 more Smart Citation

Development of a novel once-through flow visualization technique for kinetic study of bulk and surface scaling

Sanni

Bukuaghangin

Huggan

et al. 2017

Review of Scientific Instruments

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“…The formation of category-2 spherulites of vaterite in 90 wt-% monoethylene glycol has been revisited [4] since the comparably slow growth rate of vaterite in this solvent mixture [28] allows for a comprehensive time-resolved study. Crystals that have grown for only 5 min after nucleation at a temperature of 50°C and an initial supersaturation ratio of S 0,vaterite = 5.6 are depicted in Fig.…”

Section: Evolution Of Category-2 Spherulites Of Vateritementioning

confidence: 99%

Influence of Crystallization Conditions on the Growth of Polycrystalline Particles

2011

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The effect of initial supersaturation and temperature on crystal morphology below and above the threshold for the onset of spherulitic growth has been compared for calcium carbonate, L-glutamic acid, and an aromatic amine derivative in aqueous systems. For the vaterite polymorph of calcium carbonate is has also been documented how spherulites (polycrystalline particles) develop with time in a solvent mixture of water and monoethylene glycol. For the three studied substances, the temperature was found to have different effects on the compactness of the crystals. The influence of supersaturation on the onset of spherulitic growth and particle morphology, however, bears striking similarities for the investigated substances. While monocrystalline particles are found at low supersaturation, polycrystalline particles form with increasing degree of branching when supersaturation is increased.

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“…Therefore, metastable polymorph, vaterite, is not always well understood and employed. Some impurities (metal ions or organic matter) have been reported to have the ability to stabilize the vaterite and prevent its transformation into calcite or aragonite [11][12]. Here in this work, a simple laboratorial controlling method for stabilizing the vaterite phase has been induced using water-ethanol binary solvent (WEBS).…”

Section: Introductionmentioning

confidence: 99%

Phase and morphology evolution of vaterite crystals in water/ethanol binary solvent

Jin

Wang

Yue

2011

Cryst. Res. Technol.

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Keeping stability is important for metastable vaterite to be applied. In this work, crystal evolution of vaterite in water/ethanol binary solvent (WEBS) was investigated. Phase identification was confirmed by XRD measurement. It is found that the stability of vaterite is sensitive to the concentration of surplus CO 3 2-and the ethanol mole fraction in WEBS. The vaterite phase would transform to either aragonite or calcite decided by the surplus CO 3 2-ions or Ca 2+ ions, respectively. SEM observation shows that the polymorph evolution also induced the morphology change.

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Growth of the calcium carbonate polymorph vaterite in mixtures of water and ethylene glycol at conditions of gas processing

Cited by 42 publications

References 14 publications

Development of a novel once-through flow visualization technique for kinetic study of bulk and surface scaling

Development of a novel once-through flow visualization technique for kinetic study of bulk and surface scaling

Influence of Crystallization Conditions on the Growth of Polycrystalline Particles

Phase and morphology evolution of vaterite crystals in water/ethanol binary solvent

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