Polarity effects of asphaltene subfractions on the stability and interfacial properties of water-in-model oil emulsions

Liu, Daiwei; Li, Chuanxian; Zhang, Xiaoping; Yang, Fei; Sun, Guangyu; Zhang, Hao

doi:10.1016/j.fuel.2020.117450

Cited by 61 publications

(31 citation statements)

References 39 publications

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“…Asphaltenes are a class of substances determined by their solubility and degree of separation and have poor solubility in n -heptane. The asphaltene extracted from crude oil in the Shengli Oilfield refers to the methods of ASTM D6560-17, You, Carnahan, and Liu . The detailed extraction process is as follows: 10 g of Shengli crude oil was diluted with 300 mL of n -heptane (for HPLC, ≥99% (GC) Macklin) and the diluted solution was transferred into an ultrasonic homogenizer (SCIENTZ JY92-IIN) for 30 min ultrasonic treatment.…”

Section: Methodsmentioning

confidence: 99%

“…The asphaltene extracted from crude oil in the Shengli Oilfield refers to the methods of ASTM D6560-17, You, 39 Carnahan, 40 and Liu. 10 The detailed extraction process is as follows: 10 g of Shengli crude oil was diluted with 300 mL of n-heptane (for HPLC, ≥99% (GC) Macklin) and the diluted solution was transferred into an ultrasonic homogenizer (SCIENTZ JY92-IIN) for 30 min ultrasonic treatment. After that, the treated solution was centrifuged at 11 000 rpm for 40 min in a centrifuge (BOLXJ TGL-16).…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…Among these components, asphaltenes have the largest molecular weight, largest density, and largest polarity, with an average molecular weight of 750 g/mol. , Through the investigation of the molecular structure of asphaltenes, it is now widely accepted that the island and archipelago structures coexist in petroleum asphaltenes. Asphaltene mainly contains a polycyclic aromatic group consisting of about seven rings and is connected to branched-chain hydrocarbons. − Asphaltenes are propelled by acid–base catalysis, hydrogen-bonding interactions, metal coordination complexes, hydrophobic pores, and π–π stacking interactions, having a strong aggregation tendency . On account of the complex molecular structure of asphaltene molecules and the amphiphilic property of polar and nonpolar groups, asphaltenes become natural surfactants in crude oil.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on Hydrate Formation and Growth Characteristics in Dissolved Asphaltene-Containing Water-In-Oil Emulsion

Ning

Song

et al. 2021

Langmuir

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Clarifying the effect of asphaltene on hydrate formation and growth is of great significance to the operation safety in deepwater petroleum fields. To investigate the influence of low-concentration dissolved asphaltenes on the formation kinetics and growth process of hydrates in water-in-oil emulsions, experiments with asphaltene concentrations ranging from 50 to 1000 ppm were carried out using a high-pressure visual reactor. At a low concentration, the adsorption of asphaltene monomers on the oil−water interface or nanoaggregates in the bulk barely affected the nucleation of hydrate and the induction time of hydrate formation. However, it would hinder the microscopic mass transfer process and heat transfer process between gas molecules and then mitigate the initial rate of hydrate formation. Therefore, the dissolved asphaltenes could not be used as antiagglomerants (AAs) to efficiently inhibit the aggregation of hydrate particles at low concentrations under our experimental conditions, causing extensive hydrate agglomeration and deposition in the reactor.

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Section: Methodsmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation on Hydrate Formation and Growth Characteristics in Dissolved Asphaltene-Containing Water-In-Oil Emulsion

Ning

Song

et al. 2021

Langmuir

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“…Asphaltenes’ carboxylic acids (−COOH) are adsorbed at the water–oil interface and form a thin film. , Some of the asphaltenes have functional groups that affect the water and oil interface because of anionic charged functional groups. , Wu, Stanford et al, and Liu et al reported that asphaltene molecules’ compositions play a notable role in stabilizing emulsions. In contrast, Kilpatrick reviewed the emulsions and the role of natural surface-active agents and suggested that not all asphaltene molecules participate in the structure of the interface and stability of the water-in-oil emulsions.…”

Section: Asphaltenes and Emulsionmentioning

confidence: 99%

“…The number of aliphatic groups of asphaltene molecules determines their distribution in the bulk phase (oil), creating different interactions at the interface. Asphaltenes with lower polar groups are dispersed better in the bulk phase, making them migrate to the interface faster, and better distribution reduces the risk of aggregation . The study of the effect of asphaltenes concentrations by Liu et al illustrated that at a low concentration (500 ppm) the stability of emulsions with lower polar groups is higher.…”

Section: Underlying Mechanismsmentioning

confidence: 99%

Critical Review of Underlying Mechanisms of Interactions of Asphaltenes with Oil and Aqueous Phases in the Presence of Ions

Mahdavi

Moghadam

2021

Energy Fuels

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Asphaltene studies have been a prime focus topic for many decades. However, the underlying interaction mechanisms between water, oil, and asphaltenes requires more attention. Water is involved in all production parts (reservoir, tubing, surface facilities, and refinery), posing comprehensive research about the issues and operating conditions. According to the available literature, there are contradictory opinions regarding the effect of salinity on the aqueous phase and the oil phase interfacial characteristics. This review provides a critical summary of asphaltene’s role in the stability of the aqueous phase emulsions in an oil phase. We reviewed the effect of temperature, pressure, asphaltene concentration, bulk phase components, different salinity, types of ions, and pH on emulsion stability regarding the low salinity water injection aspects. Moreover, the studied cases investigating emulsion stability in the presence of asphaltenes and other species were collected, compared, and categorized. Furthermore, the interfacial and rheological characteristics of the brine–oil interface composed of asphaltenes and other species were compared. We found that the effect of some parameters requires an in-depth study as there are not many related works. For example, the effect of pressure on the rheological characteristics of emulsions and, at the same time, on the aggregation, precipitation, and deposition using visual devices (high pressure–high temperature microfluidic) is missing from the literature. Therefore, we recommend a specific study of each crude oil’s combined effects of temperature, pressure, and salinity. Low salinity water injection is a newly developed enhanced oil recovery method that employs the results of emulsion studies in the presence of different ions and reservoir conditions (high pressure and high temperature).

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Asphaltene/polymer composites: Morphology, compatibility, and rheological properties

2022

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In this study, we investigate the use of asphaltene, a natural waste product that is inevitably formed during heavy oil processing, as a filler in polymer composites. The focus of this work is on the compatibility of various asphaltenes, featuring different polarities, with several polymers, including polypropylene (PP), polystyrene (PS), polymethyl methacrylate (PMMA), and polycarbonate (PC). The Hansen solubility parameters were plotted to predict the compatibility of polymers with different asphaltenes. Then, polymer composites were prepared by two common techniques: melt mixing and solution mixing. The dispersion state of the asphaltenes in each polymer was investigated by using imaging and rheological techniques. This work showed that the network structure of the asphaltenes and, thus, the final properties of the composites can be controlled by the polarity of asphaltenes, mixing technique, and melt viscosity

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Polarity effects of asphaltene subfractions on the stability and interfacial properties of water-in-model oil emulsions

Cited by 61 publications

References 39 publications

Investigation on Hydrate Formation and Growth Characteristics in Dissolved Asphaltene-Containing Water-In-Oil Emulsion

Investigation on Hydrate Formation and Growth Characteristics in Dissolved Asphaltene-Containing Water-In-Oil Emulsion

Critical Review of Underlying Mechanisms of Interactions of Asphaltenes with Oil and Aqueous Phases in the Presence of Ions

Asphaltene/polymer composites: Morphology, compatibility, and rheological properties

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