Investigation of drop breakage and coalescence in the liquid–liquid system with nonionic surfactants Tween 20 and Tween 80

Bąk, A.; Podgórska, W.

doi:10.1016/j.ces.2012.02.021

Cited by 42 publications

(13 citation statements)

References 47 publications

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“…Tween 80 forms emulsions of 5% toluene with sizes of ≥ 50μm although the emulsions were formed at relatively lower homogenizer mixing speed and with lower concentrations of at much lower surfactant concentrations and homogenization speeds than what were used in this discussion [37]. Toluene is a simple mono-substituted aromatic that is often found in crude oil and has a similar structure to o-xylene used herein as component in the synthetic μm and reported being unable to make emulsions at lower surfactant to oil ratios such as those tested in this work [38].…”

Section: Synthetic Crude Oil Emulsificationmentioning

confidence: 94%

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Molecular editing of sophorolipids by esterification of lipid moieties: Effects on interfacial properties at paraffin and synthetic crude oil-water interfaces

Koh

Gross

2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Sophorolipids (SLs) are naturally produced glycolipid biosurfactants that offer safe alternatives to chemical surfactants that have been identified as ecologically-hazardous.Molecular editing of SLs by esterification of the lipid tail was used to prepare a family of SLesters whose hydrophobic moiety is extended from 18 carbons (17-HOC18:1Δ 9 ) to 20, 24, or 28 carbons, respectively. The interfacial properties of natural and SL-esters were evaluated with paraffin and a synthetic crude oil. SL-esters reduced paraffin oil/water interfacial tension (IFT) by 89-97% and had critical aggregation concentrations (CACs) between 0.02-0.008mg/mL. SLesters were also found to emulsify paraffin and synthetic crude oil with oil/surfactant ratios up to 200:1 wt/wt for 1 week with emulsion droplet sizes below 5μm. SL-hexyl ester had the lowest CAC, 0.008 mg/mL, and generally, the lowest droplet sizes, particularly at 10wt% paraffin oil.While, SL-decyl ester had the highest (97.2%) maximum %-IFT reduction and gave paraffin oil emulsions that were most stable over time. SL-ester emulsions of synthetic crude oil resulted in emulsion sizes that are similar to those with paraffin oil. However, the absence of SL-ester precipitation over the range of SL-ester/synthetic crude oil emulsions tested suggest that the affinity of SL-esters to the oil phase is enhanced by the presence of o-xylene and 1,2-dimethylcyclohexane in the crude oil formulation. A natural SL mixture consisting of 1:1 lactonic (LSL) and acidic (ASL) forms has a CAC that is about an order of magnitude larger than SL-esters. Furthermore, the natural SL mixture was unable to emulsify paraffin and synthetic oil when the ratio of oil-to-surfactant is greater than 1:1. The predictive connection between CAC and emulsion sizes is discussed. IFT and emulsion data show that SL-esters are promising surfactants for crude oil related oil compositions.

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Section: Synthetic Crude Oil Emulsificationmentioning

confidence: 94%

“…These studies have shown CMCs ranging from 20-130 mg/L and mSFT ranging from [32][33][34][35][36][37][38][39][40][41][42] mN/m [10][11][12][13]. Hirata et al studied the initial foaming performance of LSL [11].…”

Section: Introductionmentioning

confidence: 99%

Molecular editing of sophorolipids by esterification of lipid moieties: Effects on interfacial properties at paraffin and synthetic crude oil-water interfaces

Koh

Gross

2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…The tails of distribution of (E r /E t ) were found to be of the square-root exponential type and α min = 0.12 [4]. The upper bound of the integral in Equation 9, α x , results from the balance of stresses acting on the droplet and characterizes the weakest eddies that can disperse the drop [2,28]. The multifractal spectrum, f (α), is for practical reasons approximated by a polynomial [2] fitted to the experimental spectrum [4].…”

Section: Breakage and Coalescence Modelsmentioning

confidence: 99%

“…However, as was discussed earlier, the local intermittency can have a profound effect on breakage and a noticeable effect on coalescence. Multifractal breakage models taking into account internal intermittency [2,28] allow the scale effect on the drop size to be explained; they explain the drift of the exponent on the Weber number from −0.6 to −0.93 in dimensionless relation for a maximum stable drop:…”

Section: Introductionmentioning

confidence: 99%

“…Models for droplets smaller than the Kolmogorov scale were also formulated using multifractal formalism [2]. Multifractal breakage and coalescence models allow proper predictions to be made of the changes of the drop size distribution both for short and long agitation times [2,[28][29][30][31][32][33]. The coalescence process can be considered as an interaction triangle consisting of the continuous phase flow and two fluid particles.…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Internal Intermittency, Large Scale Inhomogeneity, and Impeller Type on Drop Size Distribution in Turbulent Liquid-Liquid Dispersions

Podgórska

2019

Entropy

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The influence of the impeller type on drop size distribution (DSD) in turbulent liquid-liquid dispersion is considered in this paper. The effects of the application of two impellers, high power number, high shear impeller (six blade Rushton turbine, RT) and three blade low power number, and a high efficiency impeller (HE3) are compared. Large-scale and fine-scale inhomogeneity are taken into account. The flow field and the properties of the turbulence (energy dissipation rate and integral scale of turbulence) in the agitated vessel are determined using the k-ε model. The intermittency of turbulence is taken into account in droplet breakage and coalescence models by using multifractal formalism. The solution of the population balance equation for lean dispersions (when the only breakage takes place) with a dispersed phase of low viscosity (pure system or system containing surfactant), as well as high viscosity, show that at the same power input per unit mass HE3 impeller produces much smaller droplets. In the case of fast coalescence (low dispersed phase viscosity, no surfactant), the model predicts similar droplets generated by both impellers. In the case of a dispersed phase of high viscosity, when the mobility of the drop surface is reduced, HE3 produces slightly smaller droplets.

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Droplet breakage and coalescence in liquid–liquid dispersions: Comparison of different kernels with EQMOM and QMOM

Gao

Buffo

et al. 2016

AIChE Journal

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Droplet coalescence and breakage in turbulent liquid–liquid dispersions is simulated by using computational fluid dynamics (CFD) and population balance modeling. The multifractal (MF) formalism that takes into account internal intermittency was here used for the first time to describe breakage and coalescence in a surfactant‐free dispersion. The log‐normal Extended Quadrature Method of Moments (EQMOM) was for the first time coupled with a CFD multiphase solver. To assess the accuracy of the model, predictions are compared with experiments and other models (i.e., Coulalogou and Tavlarides kernels and Quadrature Method of Moments [QMOM]). EQMOM and QMOM resulted in similar predictions, but EQMOM provides a continuous reconstruction of the droplet‐size distribution. Transient predictions obtained with the MF kernels result in a better agreement with the experiments. © 2016 American Institute of Chemical Engineers AIChE J, 63: 2293–2311, 2017

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Investigation of drop breakage and coalescence in the liquid–liquid system with nonionic surfactants Tween 20 and Tween 80

Cited by 42 publications

References 47 publications

Molecular editing of sophorolipids by esterification of lipid moieties: Effects on interfacial properties at paraffin and synthetic crude oil-water interfaces

Molecular editing of sophorolipids by esterification of lipid moieties: Effects on interfacial properties at paraffin and synthetic crude oil-water interfaces

The Influence of Internal Intermittency, Large Scale Inhomogeneity, and Impeller Type on Drop Size Distribution in Turbulent Liquid-Liquid Dispersions

Droplet breakage and coalescence in liquid–liquid dispersions: Comparison of different kernels with EQMOM and QMOM

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