Comprehensive review on stability and demulsification of unconventional heavy oil-water emulsions

Ma, Jun; Yao, Min‐Liang; Yang, Yan‐Ru; Zhang, Xueying

doi:10.1016/j.molliq.2022.118510

Cited by 49 publications

(25 citation statements)

References 213 publications

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“…It is well known that emulsion separation is more difficult than ordinary oil–water separation. − Moreover, the method of suction filtration is often used to separate the emulsion at this stage, which requires higher equipment cost. The SMS can be separated by shaking vigorously in the oil-in-water emulsion to be separated (shown in Supporting Video 3), which is more suitable for practical situations.…”

Section: Resultsmentioning

confidence: 99%

Durable 3D Porous Superhydrophobic Composites for Versatile Emulsion Separation in Multiple Environments

et al. 2022

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Polydopamine as a multifunctional biomimetic polymer with nonselective strong adhesion properties has become a hot research topic in recent years. However, there are a few reports on the durable and effective emulsion separation of polydopamine composites from other materials. Therefore, it is necessary to construct durable polydopamine composites to achieve selective adsorption of materials. In this work, polypyrrole (PPy)-PDA was obtained on sponges by an in situ polymerization reaction, followed by the attachment of SiO2 nanoparticles to the surface by polydimethylsiloxane to achieve superhydrophobicity. As a result, previously unreported selective superhydrophobic adsorbents for PPy-PDA coatings were obtained. The prepared sponges have an excellent adsorption capacity for oils and organic solvents. Not only can the sponges absorb 19–39 g of organic solvents per gram but they can also absorb oil from oil-in-water emulsions. The chemical oxygen demand value of the emulsion can be reduced to 219 mg/L after separation. More importantly, the performance remains good in the cycle test, and due to the construction of a durable superhydrophobic sponge, it can still maintain its relatively good performance in artificial seawater, acid–base environments, and can achieve relatively stable emulsion separation. At the same time, the potential of the polymer material composited with PDA in lasting and stable emulsion separation was also verified.

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Section: Resultsmentioning

confidence: 99%

Durable 3D Porous Superhydrophobic Composites for Versatile Emulsion Separation in Multiple Environments

et al. 2022

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“…Emulsion stability, that is, the ease of separation of oil–water emulsion, is another significant component of emulsification. Researchers engaged in the petroleum industry pay more attention to the outcomes of oil–water separation in the overground gravity separation . In this work, after different surfactant samples and crude oil CQ forming emulsions under the same condition (ω = 800 rad/min, t = 3 min), their dynamic demulsification characteristics are also investigated.…”

Section: Resultsmentioning

confidence: 99%

“…Researchers engaged in the petroleum industry pay more attention to the outcomes of oil−water separation in the overground gravity separation. 35 In this work, after different surfactant samples and crude oil CQ forming emulsions under the same condition (ω = 800 rad/min, t = 3 min), their dynamic demulsification characteristics are also investigated. Figure 12 shows the dynamic variations of different oil−water demulsification.…”

Section: Characterization Of Oil−water Emulsion Stabilitymentioning

confidence: 99%

A Novel Method to Characterize Dynamic Emulsions Generation and Separation of Crude Oil–Water System

Yue

Zou

et al. 2022

Ind. Eng. Chem. Res.

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The evaluation of the ease to generate emulsions and emulsions stability of oil−water system is essential for the investigation and application of chemical flooding technology for the enhanced oil recovery (EOR). However, the previous characterization methods have mainly focused on emulsion stability. To fill this gap, this study designed a novel instrument for visualizing the presence of emulsions and the separation of an oil−water system. Thereafter it also proposed quantitative methods: the emulsification index (EI) for characterizing the ease of surfactants to generate emulsions with crude oil and the demulsification index (DI) for describing emulsion stability. The results show that EI and DI can accurately characterize the dynamic characteristics of emulsions generation and demulsification, respectively. On the basis of the numerous test data composed by three crude oils and seven surfactants with different concentrations, the emulsifying capability and emulsion stability of different oil−water samples can be quantitatively determined. More importantly, these differences between various oil−water samples caused by surfactant concentration, surfactant types and crude oil property can also be accurately distinguished. Besides, the core flooding tests also provide support for the EI and DI and are reasonable parameters for characterization of the emulsification capability and emulsion stability of oil−water systems. Therefore, the overall investigations ultimately revealed that the parameters EI and DI can be used to determine ease of emulsion generation and separation of oil−water systems with an acceptable level of accuracy. The findings of this study provide a novel method for preparing effective chemical agents, which is useful for EOR fields with economic returns.

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“… 23 Parameters that affect the chemical demulsification process include the type and concentration of the demulsifier, the type and concentration of oil, temperature, shaking time, settling time, and salinity. 24 − 26 …”

Section: Introductionmentioning

confidence: 99%

Investigation of Dioctyl Sodium Sulfosuccinate in Demulsifying Crude Oil-in-Water Emulsions

Hassanshahi

2022

ACS Omega

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This research investigated the performance of dioctyl sodium sulfosuccinate (DSS), a double-chain anionic surfactant, in breaking crude oil-in-water emulsions. The response surface methodology was used to consider the effect of the DSS concentration, oil concentration, and shaking time on demulsification efficiency and obtain optimum demulsification conditions. Further single-factor experiments were conducted to investigate the effects of salinity, crude oil conditions (fresh and weathered), and gravity separation settling time. The results showed that DSS efficiently demulsified stable emulsions under different oil concentrations (500–3000 mg/L) within 15 min shaking time. Increasing DSS concentration to 900 mg/L (critical micelle concentration) increased the demulsification efficiency to 99%. DSS not only improved the demulsification efficiency but also did not impede the demulsifier interfacial adsorption at the oil–water interface due to the presence of the double-chain structure. The low molecular weight enables the homogeneous distribution of DSS molecules in the emulsion, leading to a high demulsification efficiency within 15 min. Analysis of variance results indicated the importance of considering the interaction of oil concentration and shaking time in demulsification. DSS could reduce the total extractable petroleum hydrocarbons in the separated water to <10 mg/L without gravity separation and could achieve promising demulsification performance at high salinity (36 g/L) and various concentrations of fresh and weathered oil. The demulsification mechanism was explained by analyzing the microscopic images and the transmittance of the emulsion. DSS could be an efficient double-chain anionic surfactant in demulsifying stable oil-in-water emulsions.

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Comprehensive review on stability and demulsification of unconventional heavy oil-water emulsions

Cited by 49 publications

References 213 publications

Durable 3D Porous Superhydrophobic Composites for Versatile Emulsion Separation in Multiple Environments

Durable 3D Porous Superhydrophobic Composites for Versatile Emulsion Separation in Multiple Environments

A Novel Method to Characterize Dynamic Emulsions Generation and Separation of Crude Oil–Water System

Investigation of Dioctyl Sodium Sulfosuccinate in Demulsifying Crude Oil-in-Water Emulsions

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