Application of Oil/Water Nanoemulsions as a New Alternative to Demulsify Crude Oil

Souza, Verônica B.; Neto, Jéssica S. G.; Spinelli, Luciana S.; Mansur, Cláudia R. E.

doi:10.1080/01496395.2012.733790

Cited by 10 publications

(10 citation statements)

References 14 publications

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“…Using high concentrations of inhibitor tends to produce self-associations in the bulk rather than adsorption on asphaltene, reducing their effectiveness [11,12]. More recently, a considerable work has grown up around the use of oil/ water nanoemulsions (NEs) in breaking down asphaltene emulsions [13,14,15]. However, efficient methods of enhancing long-term asphaltene stability with reduced AI amount are still much demanded.…”

Section: -Introductionmentioning

confidence: 99%

“…Even in low concentrations, asphaltene molecules are prone to aggregate and precipitate, causing plugging of pipelines and process equipment such as pumps, heat exchangers, or separator tanks. − Chemical treatment using asphaltene inhibitors (AIs) is one of the most common methods to prevent asphaltene precipitation. , However, it has a major problem due to the loss of a large amount of chemicals, resulting in high treatment cost . Using high concentrations of AI tends to produce self-associations from a large number of AI molecules in the bulk rather than adsorption on asphaltene, reducing their effectiveness. , More recently, considerable work has been carried out on the use of oil/water nanoemulsions (NEs) in breaking down asphaltene emulsions. − However, efficient methods of enhancing long-term asphaltene stability with reduced AI amount are still much in demand.…”

Section: Introductionmentioning

confidence: 99%

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Kinetic Study of Controlled Asphaltene Inhibitor Release from Nanoemulsions

2019

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The asphaltene aggregation and subsequent precipitation in nonpolar media may have a profound effect on plugging wellbores and production equipment. Continuing our work on controlled release of asphaltene inhibitor by using nanoemulsions (NEs), this work provides new evidence from optical measurement and reveals the release mechanisms kinetically. Multiple light scattering (Turbiscan) and dynamic light scattering (DLS) have been used to study "in situ" the effectiveness and performance of controlled release by three cases on asphaltene aggregation/precipitation: i) strong organic acids (dodecyl benzene sulfonic acid, DBSA), ii) nanoemulsions (blank NEs), and iii) nanoemulsions loaded with DBSA (DBSA NEs). The results suggested that the new approach reduced the amount of asphaltene inhibitor by ~ 20 times and achieved high asphaltene inhibition efficiency ~84 % with prolonged release time. A mechanistic understanding of the controlled release effect was proposed based the effect of DBSA NEs on the asphaltene particle morphology variation, which was related to the

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Section: -Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Kinetic Study of Controlled Asphaltene Inhibitor Release from Nanoemulsions

2019

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“…In other studies, , non-ionic polymeric surfactants based on PEO were used to prepare oil-in-water (O/W) nanoemulsions. The systems showed good separation efficiency.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Additives Based on Polyethylenimine Modified with Non-ionic Surfactants for Application in Phase Separation of Water-in-Oil Emulsions

et al. 2017

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Water-in-oil emulsions are formed during petroleum production. These emulsions are stabilized by natural emulsifiers present in the oil, such as asphaltenes, resins, and paraffins, making their separation difficult. Various treatments can promote the breakdown of these emulsions, among them demulsification, which involves the addition of demulsifiers to promote separation of the water and oil phases. This work proposes the synthesis of demulsifiers by modification of branched polyethylenimine with the introduction of different non-ionic surfactants along the chain. Specifically, we used ethoxylated surfactants based on lauryl acid and nonylphenol, with different numbers of ethylene oxide units in their chains. The modified polymers were characterized by proton nuclear magnetic resonance spectroscopy and solubility tests. Demulsifier systems were prepared by dissolving the additives in two solvent mixtures: xylene/ethanol and xylene/butylglycol. These systems were applied in demulsification tests and evaluated by measuring the water−oil interfacial tension. The results showed that the additives did not significantly alter the interfacial tension values of the systems but were able to destabilize the emulsions, promoting water−oil separation.

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“…Our research group has developed oil-in-water (O/W) nanoemulsions with different compositions for application in the pharmaceutical and petroleum sectors. , In the latter sector, we have studied their application as alternatives in the process of separating the water and oil phases. − …”

Section: Introductionmentioning

confidence: 99%

“…In a previous work, nanoemulsions were prepared using two types of ethoxylated nonionic surfactants (nonylphenol and lauryl ether) along with the solvent xylene as the oil phase, at different concentrations. The results of the demulsification tests showed that the nanoemulsions developed are a viable alternative to break down petroleum emulsions, with efficiencies ranging from 90 to 95%.…”

Section: Introductionmentioning

confidence: 99%

Oil/Water Nanoemulsions: Activity at the Water–Oil Interface and Evaluation on Asphaltene Aggregates

Souza

Mansur

2015

Energy Fuels

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Oil-in-water (O/W) nanoemulsions based on nonionic ethoxylated polymeric surfactants were prepared and evaluated for demulsification of water/oil emulsions and model asphaltene emulsions. The nanoemulsions were prepared using two nonionic ethoxylated polymeric surfactants with different numbers of ethylene oxide units in their chains and the solvents xylene and Solbrax as the oil phase, at different concentrations. The interfacial properties of the different systems applied in the demulsification process were evaluated in model emulsions and were correlated with their ability and/or speed of diffusion to the interface. Tests of asphaltene dispersion/flocculation were performed to evaluate whether the nanoemulsions change the aggregation state of asphaltenes during the demulsification process. The results of gravitational separation tests showed that the new nanoemulsion formulations studied can be applied to demulsify water/oil emulsions. Both the type of polymeric surfactant used and the type and content of the oil phase in the nanoemulsions had a significant influence on the efficiency and speed of breaking down emulsions. The efficiency was related to the surfactant hydrophilicity and the solubility parameter of the oil phase, which also affected the size of the asphaltene aggregates.

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Application of Oil/Water Nanoemulsions as a New Alternative to Demulsify Crude Oil

Cited by 10 publications

References 14 publications

Kinetic Study of Controlled Asphaltene Inhibitor Release from Nanoemulsions

Kinetic Study of Controlled Asphaltene Inhibitor Release from Nanoemulsions

Synthesis of Additives Based on Polyethylenimine Modified with Non-ionic Surfactants for Application in Phase Separation of Water-in-Oil Emulsions

Oil/Water Nanoemulsions: Activity at the Water–Oil Interface and Evaluation on Asphaltene Aggregates

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