Growth of boric acid in aqueous solution by using the rotating disc technique

Şahi̇n, Ömer; Aslan, Fevzi

doi:10.1016/j.jcrysgro.2004.05.011

Cited by 2 publications

(3 citation statements)

References 11 publications

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“…It can be said that the additives in the crystallization process affect the crystallization to a considerable extent and cause changes in the crystal size distribution by affecting certain crystallographic surfaces of the crystals. It has been reported in crystallization studies that some additives are effective in accelerating crystallization. − Industrially, it is important to produce crystals with high fractions in the CLD and smooth (regular) habit structures. In the PVM and microscopy images presented in Figure b,c, it can be seen that the crystals produced in the presence of OA have a more uniform habit structure compared to the crystals produced in the pure medium and that they did not grow dendritically.…”

Section: Resultsmentioning

confidence: 99%

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Utilization of In Situ FBRM and PVM Probes to Analyze the Influences of Monopropylene Glycol and Oleic Acid as Novel Additives on the Properties of Boric Acid Crystals

Kutluay

Ceyhan

Şahi̇n

et al. 2020

Ind. Eng. Chem. Res.

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The aim of this study was to determine the influences of monopropylene glycol (MPG) and oleic acid (OA) as novel additives on the chord length distribution (CLD) and modification of the shape of boric acid crystals in real time with the use of in situ focused beam reflectance measurement (FBRM) and particle vision and measurement (PVM) probes, which were positioned on a continuous mixed-suspension mixed-product removal (CMSMPR) crystallizer at a steady-state value. In this context, the FBRM probe was used to monitor CLD, which is expressed as the cumulative undersize square-weight percentage distribution of boric acid crystals. CLD is statistically proportional to crystal size distribution. The shapes of the boric acid crystals were viewed in real time with an in situ PVM probe. In addition, a scanning electron microscope (SEM) and an optical microscope were used to characterize the shapes of the boric acid crystals produced in the CMSMPR crystallizer. The chemical structures of the boric acid crystals were characterized by Fourier transform infrared (FT-IR) analysis. The population density of the nuclei, the nucleation rate, and the growth rate of the boric acid crystals were also calculated. As a result, it was proved that industrial problems encountered in the production of boric acid crystals by the crystallization process were eliminated especially in the presence of 100 ppm OA and 50 ppm MPG additives by FBRM, PVM, SEM analysis, and number density theory application. This study revealed novel insights into the modification of the shape of boric acid crystals and into the control of CLD in the presence of OA and MPG using in situ FBRM and PVM probes.

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Section: Resultsmentioning

confidence: 99%

“…Hence, the additives may be used as habit modifiers. It has been reported in crystallization studies that some additives are effective in inhibiting crystal growth and others are effective in accelerating crystallization. − …”

Section: Introductionmentioning

confidence: 99%

Utilization of In Situ FBRM and PVM Probes to Analyze the Influences of Monopropylene Glycol and Oleic Acid as Novel Additives on the Properties of Boric Acid Crystals

Kutluay

Ceyhan

Şahi̇n

et al. 2020

Ind. Eng. Chem. Res.

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“…The crystal growth of boric acid has been studied by different methods. Batch, fluidized bed, , and rotating disc techniques have been used to evaluate the growth rate. Those methods can estimate the overall growth rate, but they are not appropriate to determine the mechanisms involved in the growth of specific crystal faces.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Crystal Growth Monitoring of Boric Acid from Sodium or Lithium Sulfate Containing Aqueous Solutions by Atomic Force Microscopy

et al. 2023

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The crystal growth of boric acid from an aqueous solution in the absence and presence of sodium and lithium sulfate was studied by real-time monitoring. For this purpose, atomic force microscopy in situ has been used. The results show that the growth mechanism of boric acid from its pure and impure solutions is spiral growth driven by screw dislocation and that the velocity of advancement of steps on the crystal surface, and the relative growth rate (ratio of the growth rate in presence and absence of a salt) is reduced in the presence of salts. The reduction of the relative growth rate could be explained by the inhibition of advancement of steps of the (001) face mainly in the growth direction [100] caused by the adsorption of salts on the actives sites and the inhibition of the formation of sources of steps such as dislocations. The adsorption of the salts on the crystal surface is anisotropic and independent of the supersaturation and preferentially on the active sites of the (100) edge. Moreover, this information is of significance for the improvement of the quality of boric acid recovered from brines and minerals and the synthesis of nanostructures and microstructures of boron-based materials.

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Growth of boric acid in aqueous solution by using the rotating disc technique

Cited by 2 publications

References 11 publications

Utilization of In Situ FBRM and PVM Probes to Analyze the Influences of Monopropylene Glycol and Oleic Acid as Novel Additives on the Properties of Boric Acid Crystals

Utilization of In Situ FBRM and PVM Probes to Analyze the Influences of Monopropylene Glycol and Oleic Acid as Novel Additives on the Properties of Boric Acid Crystals

Real-Time Crystal Growth Monitoring of Boric Acid from Sodium or Lithium Sulfate Containing Aqueous Solutions by Atomic Force Microscopy

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