Experimental investigation and mathematical modeling of oil/water emulsion separation effectiveness containing alkali-surfactant-polymer

Aleem, Waqas; Mellon, Nurhayati; Khan, Javed Akbar; Al-Kayiem, Hussain H.

doi:10.1080/01932691.2020.1738244

Cited by 11 publications

(8 citation statements)

References 54 publications

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“…We do not observe a layer of oil forming on top of the emulsion, so no coalescence of the oil droplets is observed. Similar experiments performed on crude oil-in-water emulsions obtained during oil recovery 33,34 , do show oil drop coalescence implying that our model emulsions are more stable to coalescence than the crude oil-in-water emulsions, and so more difficult to destabilize. The decrease of the emulsion volume due to the drainage is well fitted with a simple exponential (solid line in Figure 1) allowing to assess a characteristic time of the drainage and hence the partial emulsion destabilization.…”

Section: A Water Drainage In Emulsionssupporting

confidence: 76%

Creep and drainage in the fast destabilization of emulsions

et al. 2021

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The destabilization of emulsions is important for many applications but remains incompletely understood. We perform squeeze flow measurements on oil-in-water emulsions, finding that the spontaneous destabilization of emulsions is generally very slow under normal conditions, with a characteristic time scale given by the drainage of the continuous phase and the coalescence of the dispersed phase. We show that if the emulsion is compressed between two plates, the destabilization can be sped up significantly; on the one hand, the drainage is faster due to the application of the squeezing force. On the other hand, creep processes lead to rearrangements that also contribute to the destabilization.

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Section: A Water Drainage In Emulsionssupporting

confidence: 76%

Creep and drainage in the fast destabilization of emulsions

et al. 2021

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“…The volume fraction seems to impact the creaming to a greater extent when the droplets are bigger, which is plausible as the motion of bigger droplets can more easily be hindered by the presence of obstacles (i.e., other droplets). Richardson and Zaki identified n = 4.65, while Aleem and Mellon indicated that it may vary between 2.3 and 5.5 and identified n = 5.1 in their experiments . Here, a lower value of n is obtained, probably due to a different range of droplet diameters.…”

Section: Resultsmentioning

confidence: 62%

“…The stability against droplet coalescence can be improved by using emulsifying agents that reduce the interfacial tension between the two immiscible liquids. Such emulsifiers usually do not ensure stability against creaming/sedimentation, where the driving force is the difference in density between the two phases, which causes the movement of the droplets under gravity and leads to nonuniform spatial distribution of the emulsion . For instance, in oil-in-water (O/W) emulsions, oil is usually less dense than water, so oil droplets move upward and accumulate at the top of the emulsion; this phenomenon is referred to as creaming .…”

Section: Introductionmentioning

confidence: 99%

“…Such emulsifiers usually do not ensure stability against creaming/sedimentation, where the driving force is the difference in density between the two phases, which causes the movement of the droplets under gravity and leads to nonuniform spatial distribution of the emulsion. 4 For instance, in oil-in-water (O/W) emulsions, oil is usually less dense than water, so oil droplets move upward and accumulate at the top of the emulsion; this phenomenon is referred to as creaming. 5 Once droplets are accumulated in the top or in the bottom of the container, the probability of their coalescence increases.…”

Section: Introductionmentioning

confidence: 99%

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Monitoring and Modeling of Creaming in Oil-in-Water Emulsions

Deb

Lebaz

Ozdemir

et al. 2022

Ind. Eng. Chem. Res.

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This work combines experimental and modeling investigations to monitor the dynamics of creaming in oil-in-water emulsions. Turbidity and Raman spectroscopy methods were compared for the experimental monitoring of creaming of nhexadecane droplets in water. A creaming model is developed based on the convection-diffusion equation. The model accounts for the full droplet size distribution. The experimental data were used to identify the diffusion coefficient of the oil droplets and the Richardson−Zaki coefficient correcting the effect of the local volume fraction. The droplets' size and concentration are varied to evaluate their effect on the creaming rate. The developed model could accurately predict the kinetics of creaming in the different considered cases. It can be used for emulsion stability studies, for instance, in food/pharmaceutical industries and/or for gravity separator design and monitoring.

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“…The use of environmentally friendly materials and a cost-effective method is important and is required for sustainable applications in o/w separation [17,18]. Recently, a predictive model has been developed to assess the effectiveness of separation of o/w emulsion with ASP [19]. Various studies have been carried out to overcome the nonproductive time during upstream operations [20,21].…”

Section: Introductionmentioning

confidence: 99%

De-Emulsification and Gravity Separation of Micro-Emulsion Produced with Enhanced Oil Recovery Chemicals Flooding

Khan

Ullah

et al. 2021

Energies

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The present study investigates the effect of TiO2 nanoparticles on the stability of Enhanced Oil Recovery (EOR)-produced stable emulsion. The chemical precipitation method is used to synthesize TiO2 nanoparticles, and their properties were determined using various analytical characterization techniques such as X-ray Diffraction (XRD), High-Resolution Transmission Electron Microscopy (HRTEM), and Field Emission Scanning Electron Microscopy (FESEM). The effect of TiO2 nanoparticles is evaluated by measuring oil/water (o/w) separation, rag layer formation, oil droplet size, and zeta potential of the residual EOR produced emulsion. The laser scattering technique is used to determine the o/w separation. The results showed that spherical-shaped anatase phase TiO2 nanoparticles were produced with an average particle size of 122 nm. The TiO2 nanoparticles had a positive effect on o/w separation and the clarity of the separated water. The separated aqueous phases’ clarity is 75% and 45% with and without TiO2 nanoparticles, respectively. Laser scattering analysis revealed enhanced light transmission in the presence of TiO2 nanoparticles, suggesting higher o/w separation of the ASP-produced emulsion. The overall increase in the o/w separation was recorded to be 19% in the presence of TiO2 nanoparticles, indicating a decrease in the stability of ASP-produced emulsion. This decrease in the stability can be attributed to the improved coalescence’ action between the adjacent oil droplets and improved behavior of o/w interfacial film. An observable difference was found between the oil droplet size before and after the addition of TiO2 nanoparticles, where the oil droplet size increased from 3 µm to 35 µm. A similar trend of zeta potential is also noticed in the presence of TiO2 nanoparticles. Zeta potential was −13 mV to −7 mV, which is in the unstable emulsion range. Overall, the o/w separation is enhanced by introducing TiO2 nanoparticles into ASP-produced stable emulsion.

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Experimental investigation and mathematical modeling of oil/water emulsion separation effectiveness containing alkali-surfactant-polymer

Cited by 11 publications

References 54 publications

Creep and drainage in the fast destabilization of emulsions

Creep and drainage in the fast destabilization of emulsions

Monitoring and Modeling of Creaming in Oil-in-Water Emulsions

De-Emulsification and Gravity Separation of Micro-Emulsion Produced with Enhanced Oil Recovery Chemicals Flooding

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