Application of Taylor Vortex to Crystallization

Kim, Woo‐Sik

doi:10.1252/jcej.13we143

Cited by 34 publications

(18 citation statements)

References 44 publications

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“…Our group has newly proposed a CTC as a novel continuous crystallizer . The CTC is a form of Couette–Taylor (CT) equipment that strongly promotes nucleation by specific flow with high shear force, − integrated into the MSMPR equipment in a cascading series. In the CTC, feed solutions were supplied to both MSMPR and CT equipment to flexibly control the supersaturation of the MSMPR.…”

Section: Introductionmentioning

confidence: 99%

Effect of Operating Conditions on the Characteristics of Crystalline Particles in a Cascade-Type Crystallizer

Amari

Nakamura

Takiyama

2022

Ind. Eng. Chem. Res.

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The continuous crystallization process has attracted attention, because of its high energy efficiency, low operation cost, and high product consistency. Recently, a cascade-type crystallizer (CTC) based on Couette–Taylor (CT) and mixed-suspension mixed-product-removal (MSMPR) equipment has been proposed as a novel continuous crystallizer. However, the relationship between the operating conditions and the characteristics of crystalline particles in the CTC have not yet been clarified. This Article describes the effect of the load factor for CT equipment, which is an operating parameter in the CTC, on the characteristics of crystalline particles. Scanning electron microscopy (SEM) observation and characterization revealed that the characteristics of crystalline particles, such as size, shape, size distribution, and yield, were strongly dependent on the load factor of CT in the CTC. Furthermore, evaluation of the mechanism using a classic population density plot indicated that the CT equipment functions as seeding equipment for MSMPR in the CTC. These findings are suitable for designing an operation strategy to produce crystalline particles with favorable characteristics, using the CTC for a continuous crystallization process.

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Section: Introductionmentioning

confidence: 99%

Effect of Operating Conditions on the Characteristics of Crystalline Particles in a Cascade-Type Crystallizer

Amari

Nakamura

Takiyama

2022

Ind. Eng. Chem. Res.

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“…Thus, this type of reactor is called a Couette–Taylor (CT) reactor. Due to the unique fluid motion, TVF showed a high mass transfer rate, strong radial mixing, uniform shear field, and molecular alignment and brought frequently highly distinctive results that were hardly obtainable in a typical turbulent flow. − Therefore, TVF in a CT reactor facilitated the phase transformation in the precipitation/crystallization several times faster than a turbulent flow in a continuous stirred-tank reactor (CSTR). − The effective mixing of reagents and oxidizing/reducing agents in TVF could shorten the synthesis time from hours to minutes . Furthermore, TVF resulted in distinctive results in nanoparticle synthesis.…”

Section: Introductionmentioning

confidence: 99%

Effective Dispersion of CuPd Alloy Nanoparticles Using the Taylor Vortex Flow for the Preparation of Catalysts with Relatively Clean Surfaces

Jiang

Kim

2022

ACS Appl. Nano Mater.

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Dispersion is a crucial issue in nanoparticle preparation, e.g., a nanocatalyst of a high surface−volume ratio. Unfortunately, most synthetic approaches strongly depend on an excessive amount of stabilizers and inactive supporting materials for nanoparticle dispersion, resulting in a serious loss of the active surface. In this research, an approach employing a Taylor vortex flow (TVF) is first reported to obtain the effective dispersion of nanoparticles in the synthesis. Completely dispersed nanoparticles of the CuPd alloy less than 5 nm were easily synthesized in a continuous Couette−Taylor (CT) reactor due to the strong and periodic shear field of TVF. Thus, 3.2 nm sized nanoparticles were synthesized at a rotation speed of 1200 rpm and a mean residence time of 2 min despite the use of at least 6−14 times less stabilizer compared with conventional synthetic approaches. However, large aggregates of nanoparticles are always produced in a conventional continuous stirring tank reactor (CSTR) even with a high concentration of stabilizer and a high agitation speed of 3000 rpm. Furthermore, we systematically examined the effect of various synthetic parameters such as rotating speeds, mean residence times, and concentrations of reagents and stabilizers on the dispersion and size of CuPd alloy nanoparticles. Moreover, the well-dispersed CuPd alloy nanoparticles prepared in the CT reactor exhibited enhanced electrocatalytic activity for formic acid oxidation (FAO) compared with CuPd aggregates prepared in CSTR.

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“…This flow pattern is called the wavy vortex flow (WVF) . TCR flow regime has been extensively studied to investigate the effects of mixing and axial dispersion in a number of applications. − Aljishi and his co-workers studied the effect of vortex flow in a Taylor–Couette crystallizer on the precipitation of barium sulfate crystals and how different flow regimes could impact the crystal properties . Nguyen and his co-workers employed a continuous TCR to study the effect of Taylor vortices on the phase transformation of guanosine 5-monophosphate (GMP).…”

Section: Introductionmentioning

confidence: 99%

Continuous Synthesis of Structurally Uniform Graphene Oxide Materials in a Model Taylor–Couette Flow Reactor

AlAmer

Lim

Joo

2018

Ind. Eng. Chem. Res.

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Graphene oxide (GO) has proven to be an invaluable material for a wide range of applications. The development of a bulk-scale continuous process to synthesize GO materials has become crucial. In this study, we used a model Taylor−Couette reactor with axial flow to transform the oxidation of graphite flakes into a continuous process. Efficient mixing of graphite and oxidizing agents was achieved via Taylor vortices, which remarkably shortened the duration of graphite oxide (GtO) synthesis from hours to minutes. Our results reveal that the level of oxidation increased at the Taylor vortex flow (TVF) regime and significantly decreased at other hydrodynamic flow regimes. More importantly, TVF regime resulted in structurally uniform GtO products. This confirms that the developed apparatus offers a robust method to synthesize high-quality, structurally uniform GtO in a continuous manner that can be used in numerous applications.

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Application of Taylor Vortex to Crystallization

Cited by 34 publications

References 44 publications

Effect of Operating Conditions on the Characteristics of Crystalline Particles in a Cascade-Type Crystallizer

Effect of Operating Conditions on the Characteristics of Crystalline Particles in a Cascade-Type Crystallizer

Effective Dispersion of CuPd Alloy Nanoparticles Using the Taylor Vortex Flow for the Preparation of Catalysts with Relatively Clean Surfaces

Continuous Synthesis of Structurally Uniform Graphene Oxide Materials in a Model Taylor–Couette Flow Reactor

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