Influence of Physical Properties and Process Conditions on Entrainment Behavior in a Static-Mixer Settler Setup

Barega, E. W.; Zondervan, Edwin; Haan, A.B. de

doi:10.1021/ie301580m

Cited by 16 publications

(12 citation statements)

References 34 publications

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“…Figure 5 a) shows the effect of the energy dissipation on d32 for different dispersed phase fractions while Figure 5 b) shows the effect of the energy dissipation on d32 for different oil viscosities. In accordance with the literature (Barega et al, 2013;Das et al, 2013;Theron et al, 2010), both figures show that increasing ϵ (or the velocity or the Reynolds number) induces a slight decrease in d32 due to the increase in the level of turbulence involving higher inertial forces and pressure gradients. However, d32 is constant above hydraulic ϵ= 1000 W kg -1 , which could be explained by a balance between breakup and coalescence mechanisms.…”

Section: Influence Of the Hydrodynamic Parametersupporting

confidence: 91%

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Drop size distribution monitoring of oil-in-water emulsions in SMX+ static mixers: Effect of operating and geometrical conditions

Chabanon

Sheibat‐Othman

Mdere

et al. 2017

International Journal of Multiphase Flow

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Static mixers provide enhanced mixing via a motionless element inside a rigid pipe, and are widely used for continuous mixing and blending in industry. This study focuses on the emulsification of a silicon oil-in-water system stabilized by a surfactant through SMX+ ® static mixers involving no mass transfer between the two phases. The experiments covered a large domain of dispersed fraction from dilute conditions (5 %vol.) up to concentrated ones (60 %vol.) close to phase inversion and three different viscosities from 20 to 350 mPa s with transitional or turbulent flow regimes. The number of static mixers was studied until a constant drop size distribution monitored at line with a video probe was obtained. With the considered flow rates, only the five first SMX+ elements were necessary to achieve a complete drop breakup and coalescence equilibrium, the following ones only causing a supplementary pressure drop. The influence of the number of SMX+ and energy dissipation rate was found to be of first order

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Section: Influence Of the Hydrodynamic Parametersupporting

confidence: 91%

“…The superficial velocity was also directly considered as a driving force for breakup (Barega et al, 2013):…”

Section: Correlations For the Drop Size In Turbulent Flowmentioning

confidence: 99%

Drop size distribution monitoring of oil-in-water emulsions in SMX+ static mixers: Effect of operating and geometrical conditions

Chabanon

Sheibat‐Othman

Mdere

et al. 2017

International Journal of Multiphase Flow

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show abstract

“…It has to be stable enough to prevent from coalescence and destabilization in course of polymerization. Different continuous processes are available to create liquid-liquid dispersion including membrane [13], rotor-stator [14], static mixer [15][16][17], colloid mills [14,18], high pressure homogenizer [19], mixer-settler [20] and pulsed column [21,22]. A remarkable feature of continuous liquid-liquid dispersion processes are their ability to create quickly droplet of controlled size.…”

Section: Introductionmentioning

confidence: 99%

Liquid–liquid dispersion in a continuous oscillatory baffled reactor – Application to suspension polymerization

Lobry

Lasuye²,

Gourdon

et al. 2015

Chemical Engineering Journal

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible.Liquid-liquid dispersion in a continuous oscillatory baffled reactor -Application to suspension polymerization b s t r a c tReducing energy costs, improving safety, minimizing waste are the current aims of chemical engineering. Process intensification in fine chemistry has been extensively studied but less work refers to heterogeneous reactions involving two liquid phases. This paper focuses on batch to continuous suspension polymerization transposition and especially on the liquid-liquid dispersion step. The main features of suspension polymerization reaction are based on (i) the initial liquid-liquid dispersion requiring a controlled size and narrow distribution and (ii) on the control of the final particle size during the agglomeration step by avoiding fouling which is a bottleneck for continuous flow. For the continuous transposition, liquid-liquid dispersion and reaction studies are carried out in continuous oscillatory baffled reactor (COBR) which is a multipurpose reactor. Its suitability to overcome the bottlenecks is demonstrated through the investigation of the oscillating and flow conditions or the dispersed phase holdup. A controlled droplet size distribution can be achieved. Oscillation is the main parameter responsible for droplet breakage. The suitable conditions to obtain stable dispersion are determined. For one of the first times, COBR is used for suspension polymerization.

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“…They reported that the nonNewtonian fluid flow requires a shorter length to develop than the Newtonian fluid. The above mentioned papers and others (Barega et al, 2013;Jin and Cheng, 2011), confirm that the static mixer, when compared with a conventional impeller, can yield a more controlled and scalable rate of dilution in fed batch system and also homogenize feed streams with a minimum residence time with less power consumption.…”

Section: Introductionmentioning

confidence: 76%

Numerical Investigation of the Performance of Kenics Static Mixers for the Agitation of Shear Thinning Fluids

Mahammedi

Ameur²,

Ariss

2017

JAFM

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The laminar flow of non-Newtonian fluids through a Kenics static mixer is investigated by using the CFD (Computational Fluid Dynamics) tool. The working fluids have a shear thinning behavior modeled by the Ostwald De Waele law. We focus on the effect of Reynolds number, fluid properties, twist angle and blade pitch on the flow characteristics and energy cost. The pressure drop information obtained from the simulations was compared to several experimental correlations and data available in the literature. The numerical results were found in good agreement with the experimental values. From the obtained results, the twist technique is confirmed to be very useful to enhance the mixing with less power consumption and at low Reynolds numbers. A faster axial mixing has been achieved with increased blade length and decreased twist angle. However, the good mixing near the tube walls was obtained with increased twist angle. The power consumption expressed in power drop was found to be increase with increased CMC concentrations, Reynolds number, twist angle and decreased blade length.

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Influence of Physical Properties and Process Conditions on Entrainment Behavior in a Static-Mixer Settler Setup

Cited by 16 publications

References 34 publications

Drop size distribution monitoring of oil-in-water emulsions in SMX+ static mixers: Effect of operating and geometrical conditions

Drop size distribution monitoring of oil-in-water emulsions in SMX+ static mixers: Effect of operating and geometrical conditions

Liquid–liquid dispersion in a continuous oscillatory baffled reactor – Application to suspension polymerization

Numerical Investigation of the Performance of Kenics Static Mixers for the Agitation of Shear Thinning Fluids

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