Interfacial rheology of asphaltene emulsions in the presence of nanoemulsions based on a polyoxide surfactant and asphaltene dispersant

Oliveira, Priscila Cardim de; Santos, Izabel C.V.M.; Vieira, Hélida Vasques Peixoto; Fraga, Assis K.; Mansur, Cláudia R. E.

doi:10.1016/j.fuel.2016.12.051

Cited by 25 publications

(25 citation statements)

References 23 publications

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“…An interfacial film containing asphaltenes and other petroleum components supports water droplet dispersion into the continuous phase [11,12]. Oil-in-water (o/w) emulsions are pointed out as an emergent technology for moving viscous oils.…”

Section: Introductionmentioning

confidence: 99%

Effects of Short-Chain n-Alcohols on the Properties of Asphaltenes at Toluene/Air and Toluene/Water Interfaces

Martins

Santos

2018

Colloids and Interfaces

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Abstract:Crude oil asphaltenes contain a wide series of chemical species, which includes the most polar compounds and interfacially active agents from the petroleum. Asphaltenes have been considered to be implicated in foam and emulsion formation during the petroleum recovery and production process. In this work, the interfacial activity of organic solutions containing asphaltene and n-alcohols was investigated. Asphaltene extraction from a 28 • API crude oil produced 2.5 wt % of n-pentane precipitated asphaltene (C5I). Dynamic surface and interfacial tensions of asphaltene solutions were assessed by the pendant drop method. Asphaltene films were evaluated at the air-water interface using a Langmuir trough. Results were expressed by means of the interfacial tension time-dependence. Interfacial tension measurements showed alcohols reduce the toluene/water interfacial tension of asphaltene solutions. The interfacial tension was reduced from 23 mN/m to 15.5 mN/m for a 2 g/L solution of asphaltene plus n-butanol. Higher asphaltene concentrations did not affect the toluene/air surface tension. The effects of n-alcohols on the asphaltene surface activity was dependent on the asphaltene aggregation state. n-Alcohols modify the asphaltene film elasticity and the film phase behavior.

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Section: Introductionmentioning

confidence: 99%

Effects of Short-Chain n-Alcohols on the Properties of Asphaltenes at Toluene/Air and Toluene/Water Interfaces

Martins

Santos

2018

Colloids and Interfaces

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“…38 It is well accepted that G ′ and G ″ are related to the properties and stability of emulsions. 39 High values of G ′ and G ″ mean a stable emulsion. 40 Moreover, G ′ is taken as a good indicator of the interaction and cross-linking of interfacial molecules.…”

Section: Resultsmentioning

confidence: 99%

“…The demulsifier molecules are absorbed onto the oil–water interface and compete with the natural surfactant and added additives, resulting in the formation of a less elastic interface with a lower value of G ′. 39 As more molecules diffuse to the interface, the viscoelasticity continues to decline accompanied by a rapid reduction of the stability of the interfacial film. This behavior promotes the coalescence of water droplets leading to the change of the emulsion’s properties.…”

Section: Resultsmentioning

confidence: 99%

Practical Modification of Tannic Acid Polyether Demulsifier and Its Highly Efficient Demulsification for Water-in-Aging Crude Oil Emulsions

Liu

et al. 2019

ACS Omega

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In order to break the aging crude oil (WACO) emulsion of the offshore platform more effectively, a highly active isocyanate, polyaryl polymethylene isocyanate (PAPI), was selected to modify the pilot-scale tannic acid demulsifier. In the addition of PAPI, its molecular weight and viscosity dramatically increased, while its relative solubility, hydroxyl number, and cloud point exhibited an opposite direction, showing an increase in hydrophobicity. After adding the above modified demulsifier, a remarkably improved water removal of WACO emulsion accompanied by a notable reduction of the water content in the oil phase monitored by the Karl Fischer method was observed. Demulsification on the offshore platform demonstrated that the best water removal was achieved when the proportion of PAPI is 1.5 wt %. Its demulsification efficiency reached 95.7%, which was 25.6% higher than the 76.2% of unmodified demulsifier. In addition, a positive correlation between viscoelasticity of emulsion and demulsification performance was found by only adjusting the parameters of the rheometer. This method may be utilized to characterize the demulsification performance by any rotary rheometer. The pilot-scale demulsification experiment demonstrated that the water removal can reach 98.14 vol % and residual water content was only 0.55 vol %. These results further confirmed the excellent demulsification performance of the modified demulsifier toward the WACO emulsion in production.

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“…Some studies have evaluated the asphaltene/air and asphaltene/water interfaces of solutions using the Du Noüy ring (Oliveira et al, 2017), while others have used the BiCone accessory (Fan et al, 2010;Spiecker & Kilpatrick, 2004;Kilpatrick & Spiecker, 2001). However, to the best of our knowledge, no studies have been published involving rheological analysis applied at the crude oil/air interface to investigate the formation of foams.…”

Section: Introductionmentioning

confidence: 99%

Studying the Influence of Antifoaming Additives on Crude Oil/Air Interface: Proposal of a New Methodology

Mendes

Ramalho

Júnior

et al. 2019

BJPG

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Foams generated during oil production are complex systems. The complexity of their continuous phase makes it difficult to understand what occurs in the foam layers. Some studies have shown that the main species that stabilize foams are asphaltenes, because they reduce the surface tension of the bubbles with their interfacial activity, causing this surface to become viscoelastic. To understand surface viscoelasticity, it is necessary to investigate the rheology of the crude oil/air interface. Since the great majority of works published have used a Du Noüy ring or BiCone accessory to evaluate the surface only of model asphaltene systems, the aim of this work is to study the crude oil/air interface of different crude oil samples and different antifoaming products using the BiCone accessory.

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Interfacial rheology of asphaltene emulsions in the presence of nanoemulsions based on a polyoxide surfactant and asphaltene dispersant

Cited by 25 publications

References 23 publications

Effects of Short-Chain n-Alcohols on the Properties of Asphaltenes at Toluene/Air and Toluene/Water Interfaces

Effects of Short-Chain n-Alcohols on the Properties of Asphaltenes at Toluene/Air and Toluene/Water Interfaces

Practical Modification of Tannic Acid Polyether Demulsifier and Its Highly Efficient Demulsification for Water-in-Aging Crude Oil Emulsions

Studying the Influence of Antifoaming Additives on Crude Oil/Air Interface: Proposal of a New Methodology

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