Coalescence of charged droplets in agitated liquid‐liquid dispersions

Tobin, T.; Ramkrishna, D.

doi:10.1002/aic.690380807

Cited by 38 publications

(23 citation statements)

References 7 publications

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“…The creaming stability of the emulthe orthokinetic coalescence efficiency in a coalescing drop population. It has been demonstrated that interdroplet elec-sion that was produced using a valve homogenizer was found to be higher at higher power consumption in a narrow region trostatic forces can substantially inhibit coalescence between drops in agitated dispersions (7). Very few attempts have as compared with ultrasonication.…”

Section: Introductionmentioning

confidence: 98%

Coalescence of Protein-Stabilized Emulsions in a High-Pressure Homogenizer

Mohan

Narsimhan

1997

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 98%

Coalescence of Protein-Stabilized Emulsions in a High-Pressure Homogenizer

Mohan

Narsimhan

1997

Journal of Colloid and Interface Science

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“…The investigations of Tobin and Ramkrishna (1992) in stirred liquid/liquid systems showed that an increase in pH results in a decrease of drop sizes which was attributed to the coalescence inhibition caused by adsorption of hydroxide ions at the interface and a resulting repulsive force. With addition of sodium chloride and therefore rising ionic strength, the coalescence inhibition was reduced and the drop sizes in the system increased, which agrees with the DLVO theory.…”

Section: Introductionmentioning

confidence: 99%

Coalescence efficiency model including electrostatic interactions in liquid/liquid dispersions

Kamp¹,

Kraume²

2015

Chemical Engineering Science

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The drop size distribution is an essential process variable in liquid/liquid systems and relevant in many technical applications. It can be described by population balance equations. A coalescence efficiency model was developed to be able to describe the well-known coalescence inhibition due to changing pH value or salt concentration. The model includes the attractive van der Waals and repulsive electrostatic force according to the DLVO theory into the population balance equation framework. This DLVO model can extend existing simulations in a straightforward manner due to a conceptual implementation. Moreover, zeta potential measurements were performed and the model was applied to simulate experiments in a stirred tank. Hence, the drop size distribution could be predicted well with changing pH value. The results are discussed in comparison to simulations with existing models in literature.

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“…But up to now these models describe the coalescence behavior only qualitatively but not quantitatively because they do not take all relevant parameters into account, e.g. electrostatic repulsion forces [15,16]. The ionic strength and the pH value of the system are important influence factors.…”

Section: Modelingmentioning

confidence: 97%

The Droplet Population Balance Model – Estimation of Breakage and Coalescence

Simón

Schmidt

Bart³

2003

Chem Eng & Technol

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A droplet population balance model is employed in order to describe the hydrodynamic behavior of solvent extraction columns. This model describes the axial change of local column holdup and local droplet size distributions due to the basic phenomena, like droplet rising, axial dispersion, droplet breakage and coalescence. In order to reduce experimental efforts, single and swarm droplet experiments in small lab-scale devices were performed. For this, a rotating disc contactor (RDC) with one compartment and a Venturi tube were used to investigate droplet breakage and droplet coalescence. In case of breakage the experiments were made for different droplet sizes at different rotor speeds for the EFCE system toluene/water, whereas the investigations of the coalescence phenomena depending on droplet size and holdup were done with the EFCE system n-butylacetate/water.

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Coalescence of charged droplets in agitated liquid‐liquid dispersions

Cited by 38 publications

References 7 publications

Coalescence of Protein-Stabilized Emulsions in a High-Pressure Homogenizer

Coalescence of Protein-Stabilized Emulsions in a High-Pressure Homogenizer

Coalescence efficiency model including electrostatic interactions in liquid/liquid dispersions

The Droplet Population Balance Model – Estimation of Breakage and Coalescence

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