Results 151 to 160 of about 8,294 (210)

Model molecules mimicking asphaltenes [PDF]

Advances in Colloid and Interface Science, 2015
Asphalthenes are typically defined as the fraction of petroleum insoluble in n-alkanes (typically heptane, but also hexane or pentane) but soluble in toluene.
Zhenghe Xu, Sébastien Simon, Johan Sjöblom   +2 more
exaly   +3 more sources

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Interfacial behavior of asphaltenes

Advances in Colloid and Interface Science, 2016
We review the existing literature on asphaltenes at various types of interfaces: oil-water, air-water, gas-oil and solid-liquid, with more emphasis on the oil-water interfaces. We address the role of asphaltene aggregation, recently clarified for asphaltenes in bulk by the Yen-Mullins model.
Jean-Francois ARGILLIER, Dominique Langevin   +1 more
exaly   +3 more sources

ADSORPTION OF ASPHALTENE FUNTIONALITIES AND ASPHALTENE ON GOETHTTE

Fuel Science and Technology International, 1995
ABSTRACT Solid-stabilized water-in-oil emulsions cause many problems such as oil loss, fouling of a processing unit, and environmental hazard in the petroleum production and refining. The ability of finely divided solids to stabilize these emulsions is due to the adsorption of asphaltenes and other heavy constituents. This study presents the individual
Young W. Jeon, Sug H. Yi, Sang J. Choi
openaire   +1 more source

Solution Properties of Asphaltenes

Langmuir, 2008
Ultracentrifugation has been used to produce asphaltene fractions of reduced polydispersity. The structure of these asphaltene fraction solutions has been investigated using viscosity and X-ray scattering (SAXS) measurements as a function of concentration.
Loïc, Barré, Sébastien, Simon, Thierry, Palermo   +2 more
openaire   +2 more sources

Asphaltene Cake Properties

Energy & Fuels, 2008
One of the major problems encountered during the exploitation of the oil reservoir is the deposition of asphaltene in the porous rock near the wellbore. The crude oil asphaltene considerably reduces the rock permeability and, consequently, the oil production.
Montel, Valérie, Lazzeri Pordoy, Véronique, Brocart, B., Zhou, Honggang   +3 more
openaire   +2 more sources

Electrokinetic Characterization of Asphaltenes and the Asphaltenes−Resins Interaction

Energy & Fuels, 2003
The electrophoretic mobility of asphaltene particles formed by precipitation induced by the addition of n-heptane to asphaltene solutions in toluene was measured in water and in nonpolar media. Dispersed in water, the particles presented a negative electrophoretic mobility, whereas in toluene their mobility was positive and around 2.0 × 10-9 m2/V s ...
Gaspar González, Guilherme B. M. Neves, Sandra M. Saraiva, Elizabete F. Lucas, Marcia dos Anjos de Sousa   +4 more
openaire   +1 more source

Effects of asphaltene concentration and asphaltene agglomeration on viscosity

Fuel, 2019
Abstract Asphalenes are regarded as the most polar and heaviest components in crude oil system. Their precipitation and agglomeration cause problems in oil recovery, production, and transportation. Asphaltenes are directly responsible for determining the viscosity of crude oil.
Xingxun Li, Pengcheng Chi, Xuqiang Guo, Qiang Sun   +3 more
openaire   +1 more source

Squalene in Petroleum Asphaltenes

Science, 1981
Squalene, 2,6,10,15,19,23-hexamethyl-2,6,10,14,18,22-tetracosahexaene, a new biological marker, has been detected in various petroleum asphaltenes and their pyrolysis products. Since squalene is the most common triterpenoid in nature and the biological precursor of the important tetra- and pentacyclic triterpane markers, its detection in asphaltene ...
N, Samman, T, Ignasiak, C J, Chen, O P, Strausz, D S, Montgomery   +4 more
openaire   +2 more sources

The Fractal Aggregation of Asphaltenes

Langmuir, 2013
This paper discusses time-resolved small-angle neutron scattering results that were used to investigate asphaltene structure and stability with and without a precipitant added in both crude oil and model oil. A novel approach was used to isolate the scattering from asphaltenes that are insoluble and in the process of aggregating from those that are ...
Michael P, Hoepfner, Cláudio Vilas Bôas, Fávero, Nasim, Haji-Akbari, H Scott, Fogler   +3 more
openaire   +2 more sources

Stability and Aggregation of Asphaltenes in Asphaltene−Resin−Solvent Mixtures

Energy & Fuels, 2004
The Integral Equation Theory (IET) of fluids and molecular dynamics (MD) simulations have been used to study the stability and aggregation of asphaltenes in asphaltene−resin mixtures with different host solvents (n-heptane, toluene, and pyridine).
A. Ortega-Rodriguez, Y. Duda, F. Guevara-Rodriguez, C. Lira-Galeana   +3 more
openaire   +1 more source