An experimental study of immiscible liquid–liquid dispersions in a pump–mixer of mixer–settler

Tang, Qiao; Zhang, Jiyizhe; Wu, Yuxin; Wang, Yundong; Liu, Zuohua

doi:10.1016/j.cjche.2019.07.022

Cited by 8 publications

(7 citation statements)

References 27 publications

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“…Emulsification processes have been used in a wide range of industries such as pharmaceuticals, cosmetics, and food, etc. − and have been involved in various unit operations such as extraction, chemical reactions, polymerization, and so on. − The average droplet size and droplet size distribution (DSD) of the products are pivotal parameters to evaluate the emulsion performance, owing to the significant effects on the available area of mass transfer, the stability, and the rheology. , …”

Section: Introductionmentioning

confidence: 99%

“…4−6 The average droplet size and droplet size distribution (DSD) of the products are pivotal parameters to evaluate the emulsion performance, owing to the significant effects on the available area of mass transfer, the stability, and the rheology. 7,8 In a wide range of industrial applications, emulsions with controllable size and DSD exhibit unique advantages. Span is an important size distribution index to assess the emulsion, in which the smaller is the value of span, the more uniform is the DSD.…”

Section: Introductionmentioning

confidence: 99%

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Novel Rotor-Stator Assembly Promotes the Emulsification Performance in an Inline High-Shear Mixer

Zhao

Guo

et al. 2022

Ind. Eng. Chem. Res.

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For industrial emulsification processes, it remains a challenge to obtain desirable droplet size distribution (DSD) as well as a smaller span via facile and efficient routes. In this work, a novel blind-side rotor is designed to assemble with the stator of a laboratory-scale inline high-shear mixer equipped with an annular cylinder inside the mixing chamber (bRS HSM). The effects of operating parameters, structural parameters on the average droplet size, DSD, and span are experimentally investigated and compared with those of commercially used toothed-type rotor-stator assembly. In addition, computational fluid dynamics calculations are performed to investigate the influences on the flow field of the fluid within the HSM. The results show that the structure of the bRS HSM not only generates an optimal span but also reduces the energy consumption of the mixer, which is more advantageous for production of emulsions with narrower DSD. In the bRS HSM, Sauter mean diameter (d 32) and span decrease with increasing rotor speed but decreasing flow rate of the continuous phase, while span decreases and then increases with increasing volume fraction of the dispersed phase. Meanwhile, the effect of structural parameters on span is nonmonotonic. Furthermore, the artificial neural network (ANN) model is used to perform the correlation of d 32 and span, providing an estimation method to optimize the operating and structural parameters of the inline HSM in the emulsification process.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel Rotor-Stator Assembly Promotes the Emulsification Performance in an Inline High-Shear Mixer

Zhao

Guo

et al. 2022

Ind. Eng. Chem. Res.

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“…Tang et al also published a study in a square-tank continuous pump-mixer with CFD combined with PBM relying on flow field PIV measurements [15]. They correlated their data but only investigated a flow rate of 3 L/min, which was controlled by a peristaltic pump [16].…”

Section: Introductionmentioning

confidence: 99%

“…However, predictive simulations of fluid dynamic (flow rates, flow patterns, local energy dissipation) and hydrodynamic behavior (local droplet size distributions, local and integral holdup) are not yet possible. Another problem is that some publications use pumps to operate multiphase pump-mixers [14,16], so there is a change in residence time, dispersing properties, and the resulting DSD.…”

Section: Introductionmentioning

confidence: 99%

Fluid Dynamics in a Continuous Pump-Mixer

et al. 2022

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The fluid dynamic (flow rates) and hydrodynamic behavior (local droplet size distributions and local holdup) of a continuous DN300 pump-mixer were investigated using water as the continuous phase and paraffin oil as the dispersed phase. The influence of the impeller speed (N = 375 to 425 rpm), the feed phase ratio (φF = 10 to 30 vol.-%), and the flow rate (V˙tot ≈ 0.5 to 2.3 L/min) were investigated by measuring the pumping height, local holdup of the disperse phase, and the droplet size distribution (DSD). The latter one was measured at three different vessel positions using an image-based telecentric shadowgraphic technique. The droplet diameters were extracted from the acquired images using a neural network. The Sauter mean diameters were calculated from the DSD and correlated with an extended model based on Doulah (1975), considering the impeller speed, the feed phase ratio, and additionally the flow rate. The new correlation can describe an extensive database containing 155 experiments of the fluid and hydrodynamic within a 15% error range.

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“…Ghotli et al [5] used the microscopic method combined with image analysis for the drop size determination for radial disc impellers with variously curved blades and axial impellers. Tang et al [6] adopted the method of a built-in endoscopic probe combined with a pulsed laser to measure the droplet size in liquid-liquid dispersions in a mixer-settler apparatus. More than 1000 droplets were counted in each experiment run to obtain DSD distribution.…”

Section: Introductionmentioning

confidence: 99%

The Liquid–Liquid Dispersion Homogeneity in a Vessel Agitated by a High-Shear Sawtooth Impeller

Formánek

Šulc

2020

Processes

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The agitation of immiscible liquids or solid suspensions is a frequent operation in chemical and metallurgical industries. The product quality yield and economy of the processes are significantly affected by mixing conditions. Prediction of mean drop size distribution (DSD) during agitation is fundamental for processes in many branches of industry where the mass transfer is crucial. This contribution aims to analyze the homogeneity of a dispersed system in a vessel agitated by a high-shear sawtooth impeller. The homogeneity of liquid–liquid dispersion is determined by comparison of Sauter mean diameters and drop size distribution (DSD) from different measured regions and for various dispersion times. The experiments were carried out in a baffled vessel for various impeller speeds. The sizes of droplets were obtained by the in-situ measurement technique and by the image analysis (IA) method.

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An experimental study of immiscible liquid–liquid dispersions in a pump–mixer of mixer–settler

Cited by 8 publications

References 27 publications

Novel Rotor-Stator Assembly Promotes the Emulsification Performance in an Inline High-Shear Mixer

Novel Rotor-Stator Assembly Promotes the Emulsification Performance in an Inline High-Shear Mixer

Fluid Dynamics in a Continuous Pump-Mixer

The Liquid–Liquid Dispersion Homogeneity in a Vessel Agitated by a High-Shear Sawtooth Impeller

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