Rheological properties of highly concentrated dense packed layer emulsions (w/o) stabilized by asphaltene

Keleşoğlu, Serkan; Barrabino, Albert; Sørland, Geir Humborstad; Simon, Sébastien; Paso, Kristofer; Sjöblom, Johan

doi:10.1016/j.petrol.2014.11.031

Cited by 26 publications

(11 citation statements)

References 42 publications

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“…Both lignosulfonates and asphaltenes are poly-branched and exhibiting a tendency for self-association. In addition, lignosulfonates and petroleum asphaltenes have in common that emulsions stabilized by these components require overnight storage before processing [9,136], as the emulsions would otherwise be less stable. These two species have hence been compared in terms of interfacial phenomena [53].…”

Section: Adsorption At Surfaces and Interfacesmentioning

confidence: 99%

A Critical Review of the Physicochemical Properties of Lignosulfonates: Chemical Structure and Behavior in Aqueous Solution, at Surfaces and Interfaces

Ruwoldt¹

2020

Surfaces

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Lignosulfonates are bio-based surfactants and specialty chemicals, which are generated by breaking the near-infinite lignin network during sulfite pulping of wood. Due to their amphiphilic nature, lignosulfonates are used in manifold applications such as plasticizer, dispersant, and stabilizer formulations. Function and performance are determined by their behavior in aqueous solution and at surfaces and interfaces, which is in turn imposed by the chemical make-up. This review hence summarizes the efforts made into delineating the physicochemical properties of lignosulfonates, while also relating to their composition and structure. Lignosulfonates are randomly branched polyelectrolytes with abundant sulfonate and carboxylic acid groups to ensure water-solubility. In aqueous solution, their conformation, colloidal state, and adsorption at surfaces or interfaces can be affected by a range of parameters, such as pH, concentration of other electrolytes, temperature, and the presence of organic solvents. These parameters may also affect the adsorption behavior, which reportedly follows Langmuir isotherm and pseudo second-order kinetics. The relative hydrophobicity, as determined by hydrophobic interaction chromatography, is an indicator that can help to relate composition and behavior of lignosulfonates. More hydrophobic materials have been found to exhibit a lower charge density. This may improve dispersion stabilization, but it can also be disadvantageous if an electrokinetic charge needs to be introduced at solid surfaces or if precipitation due to salting out is an issue. In addition, the monolignol composition, molecular weight distribution, and chemical modification may affect the physicochemical behavior of lignosulfonates. In conclusion, the properties of lignosulfonates can be tailored by controlling aspects such as the production parameters, fractionation, and by subsequent modification. Recent developments have spawned a magnitude of products and technologies, which is also reflected in the wide variety of possible application areas.

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Section: Adsorption At Surfaces and Interfacesmentioning

confidence: 99%

A Critical Review of the Physicochemical Properties of Lignosulfonates: Chemical Structure and Behavior in Aqueous Solution, at Surfaces and Interfaces

Ruwoldt¹

2020

Surfaces

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“…A lot of studies have been devoted to the rheological behavior of water-in-crude oil emulsions (see, for example [17][18][19][20][21][22]) to better understand these complex systems [23,24] including the role of surfactants and stabilizers [25] and chemical composition of crude oil [26] and droplet size [27]. Viscous and viscoelastic properties depend on many factors such as the viscosity of the crude oil itself, droplet size and size distribution, mechanical impurities if any, dispersed phase (water) content, pH of the aqueous phase, the temperature etc.…”

Section: Introductionmentioning

confidence: 99%

Rheology of Water-in-Crude Oil Emulsions: Influence of Concentration and Temperature

Kolotova

Kuchina

Petrova

et al. 2018

Colloids and Interfaces

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The effect of aqueous phase content and temperature North Sea crude oil emulsion viscoelastic behavior has been studied. Heavy crude oil from the North Sea is of high viscosity and is capable of forming stable water-in-crude oil (w/o) emulsions without introducing any synthetic surfactants. The aqueous phase volume content was varied from 1 to 40%, and the temperature was varied from 0 to 30 • C. The w/o emulsion viscosity increased sharply when the aqueous phase content exceeds 20%, being more pronounced at the lower temperatures. The viscosity flow curves for emulsions containing more than 20% aqueous phase demonstrate non-Newtonian behavior, in contrast to crude oil, which is Newtonian. The coefficients in the master curve describing the viscosity-temperature dependence were determined. Oscillatory rheological tests showed that the loss modulus substantially exceeds the storage modulus which indicates the liquid-like state of the emulsions.

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“…Studies of viscosity response of petroleum fluids under different shearing conditions and temperatures find important applications in the production and flow assurance (Zhang et al 2013;Kelesoglu et al 2015). Figure 7 is the plots of viscosity versus shear rate of the ternary-component Fig.…”

Section: Effect Of Silica Content On the Viscosity Of The Ternary-phamentioning

confidence: 99%

Investigation into the effect of silica nanoparticles on the rheological characteristics of water-in-heavy oil emulsions

2019

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The effect of silica nanoparticles on the rheological characteristics of water-in-heavy oil emulsions has been investigated. Enhanced oil recovery methods for heavy oil production (most especially, thermal fluid injection) usually result in the formation of water-in-oil (W/O) emulsion. In reality, the emulsion produced also contains some fine solid mineral particles such as silica, which, depending on its quantity, may alter the viscosity and/or rheological properties of the fluid. A series of binary-component emulsions were separately prepared by dispersing silica nanoparticles [phase fraction, β s , = 0.5%-5.75% (wt/v)] in heavy oil (S/O suspension) and by dispersing water [water cut, θ w = 10%-53% (v/v)] in heavy oil (W/O emulsion). Ternary-component emulsions comprising heavy oil, water droplets and suspended silica nanoparticles (S/W/O) were also prepared with similar ranges of θ w and β s . The viscosity was measured at different shear rates (5.1-1021.4 s −1 ) and temperatures (30-70 °C). Both binary-component and ternary-component emulsion systems were observed to exhibit non-Newtonian shear thinning behaviour. The viscosity of the heavy oil and W/O emulsions increased in the presence of silica nanoparticles. The effect was, however, less significant below β s = 2% (wt/v). Moreover, a generalized correlation has been proposed to predict the viscosity of both binary-component and ternary-component emulsions.

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Rheological properties of highly concentrated dense packed layer emulsions (w/o) stabilized by asphaltene

Abstract: ABSTRACT

Cited by 26 publications

References 42 publications

A Critical Review of the Physicochemical Properties of Lignosulfonates: Chemical Structure and Behavior in Aqueous Solution, at Surfaces and Interfaces

A Critical Review of the Physicochemical Properties of Lignosulfonates: Chemical Structure and Behavior in Aqueous Solution, at Surfaces and Interfaces

Rheology of Water-in-Crude Oil Emulsions: Influence of Concentration and Temperature

Investigation into the effect of silica nanoparticles on the rheological characteristics of water-in-heavy oil emulsions

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