Barium Sulfate Crystallization Kinetics in the Used Quenching Salts Treatment Process

Matynia, A.; Piotrowski, Krzysztof; Koralewska, J.; Wierzbowska, B.

doi:10.1002/ceat.200401878

Cited by 12 publications

(17 citation statements)

References 11 publications

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“…This can be the case in solutions where the dynamics of the aqueous solvent structure increases with X, for example as a result of addition of negatively hydrated solutes. Our observations are in agreement with other experimental results that have shown that increasing the concentration of the chloride salt of the negatively hydrated potassium ion increases the linear growth rate of barite, while chloride salts of positively hydrated sodium and calcium ions mainly increase nucleation rates (Matynia et al, 2004).…”

Section: Solvent Structure Dynamics Kinetics Of Nucleation and Crystsupporting

confidence: 93%

Kinetics of crystal nucleation in ionic solutions: Electrostatics and hydration forces

Kowacz

Prieto

Putnis

2010

Geochimica et Cosmochimica Acta

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The heat of precipitation, the mean crystal size and the broadness of crystal size distribution of barium sulfate precipitating in aqueous solutions of different background electrolytes (KCl, NaCl, LiCl, NaBr or NaF), was shown to vary at constant thermodynamic driving force (supersaturation) and constant ionic strength depending on the salt present in solution. The relative inversion in the effect of respective background ions on the characteristics of barite precipitate was observed between two studied supersaturation (X) and ionic strength (IS) conditions. The crystal size variance (b 2 ) increased in the presence of background electrolytes in the order LiCl < NaCl < KCl at X = 10 3.33 and IS = 0.03 M and KCl < NaCl < LiCl at X = 10 3.77 and IS = 0.09 M. At a given X and IS the respective size of barite crystals decreased with increasing b 2 in chloride salts of different cations and remained constant in sodium salts of different anions.We suggest that ionic salts affect the kinetics of barite nucleation and growth due to their influence on water of solvation and bulk solvent structure. This idea is consistent with the hypothesis that the kinetic barrier for barium sulfate nucleation depends on the frequency of water exchange around respective building units that can be modified by additives present in solution. In electrolyte solution the relative switchover between long range electrostatic interactions and short range hydration forces, which influence the dynamics of solvent exchange between an ion solvation shell and bulk fluid, results in the observed inversion in the effect of differently hydrated salts on nucleation rates and the resulting precipitate characteristics.

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Section: Solvent Structure Dynamics Kinetics Of Nucleation and Crystsupporting

confidence: 93%

Kinetics of crystal nucleation in ionic solutions: Electrostatics and hydration forces

Kowacz

Prieto

Putnis

2010

Geochimica et Cosmochimica Acta

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“…Matynia and Wierzbowska [3,4] found experimentally that the use of the solvent mixtures water/methanol and water/ isopropanol instead of pure water is advantageous in the crystallization process of ascorbic acid.…”

Section: Introductionmentioning

confidence: 99%

“…The pure crystalline ascorbic acid (98 %) is obtained industrially by several recrystallization steps from water solvents at low temperatures [1]. The purification by recrystallization is a post-treatment process after the biotechnical production of ascorbic acid from d-glucose.…”

Section: Introductionmentioning

confidence: 99%

Effect of Solvent Composition on Crystallization Process of Ascorbic Acid

Omar

2006

Chem Eng & Technol

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The crystal growth kinetics of ascorbic acid in water and in the solvent systems water/ethanol, water/methanol, and water/ propanol is determined by means of seeded isothermal batch crystallization experiments. The measurements are correlated by a power low equation of the form (G = k g r n ). The composition of the solvent system is found to have a significant influence on the kinetic parameters of growth of ascorbic acid. An increase in growth rate in the presence of alcoholic solvents (20 wt %) is measured compared to experiments with pure water. The thermodynamic effect of the solvent on the growth kinetics is approached by the UNIFAC method. The kinetic effect of solvent composition is explained using the two-step model. Both thermodynamic and kinetic analyses give the same result: The addition of alcoholic solvents (20 wt % ethanol, methanol, and propanol) to the ascorbic acid/water system slightly reduces the diffusion rate and significantly accelerates the surface integration process.

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“…A continuous DTM↑ crystallizer with a liquid jet-pump device [15] was presented in detail in the previous authors' works [21,22]. Adaptation of a jet-pump characteristics equation to the specific hydraulic regime when a jet-pump system is applied in a DTM-type crystallizer for internal circulation of crystal suspension (two-phase flow mode) was described in detail in [19,22,23].…”

Section: Test Setup and Proceduresmentioning

confidence: 99%

“…1 [21]. To complete the data, the concentration of the crystal phase in suspension (M T ), necessary (minimum) unit power of a jet-pump feeding stream (P eu ), as well as the value of the residual magnesium ions concentration in a mother liquid ([Mg 2+ ] ML ) representing indirectly the undischarged supersaturation of struvite were also presented.…”

Section: Crystal Product Propertiesmentioning

confidence: 99%

Reaction‐Crystallization of Struvite in a Continuous Liquid Jet‐Pump DTM MSMPR Crystallizer with Upward Circulation of Suspension in a Mixing Chamber – an SDG Kinetic Approach

et al. 2007

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The experimental results concerning kinetic aspects of struvite precipitation in a continuous DTM-type crystallizer with internal circulation of suspension forced by a liquid jet-pump are presented and discussed. Nucleation and crystal growth rates of struvite during reaction-crystallization processes in diluted water solutions of magnesium, ammonium, and phosphate ions were identified. Kinetic parameters were calculated on the basis of population density distributions adopting a simplified model of the mass crystallization process in a MSMPR crystallizer taking under consideration size-dependent growth (SDG) mechanism. The Rojkowski hyperbolic SDG model has proved to be the equation best statistically fitted to our own data set.

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Barium Sulfate Crystallization Kinetics in the Used Quenching Salts Treatment Process

Cited by 12 publications

References 11 publications

Kinetics of crystal nucleation in ionic solutions: Electrostatics and hydration forces

Kinetics of crystal nucleation in ionic solutions: Electrostatics and hydration forces

Effect of Solvent Composition on Crystallization Process of Ascorbic Acid

Reaction‐Crystallization of Struvite in a Continuous Liquid Jet‐Pump DTM MSMPR Crystallizer with Upward Circulation of Suspension in a Mixing Chamber – an SDG Kinetic Approach

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