Asphaltene dispersions in dilute oil solutions

Evdokimov, Igor N.; Eliseev, N. Yu.; Akhmetov, B.R.

doi:10.1016/j.fuel.2006.01.006

Cited by 50 publications

(56 citation statements)

References 33 publications

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“…Several studies using highquality-factor (high-Q) ultrasonics [5], static light scattering [6], direct-current (DC) conductivity [7] and nuclear magnetic reso- * Corresponding author. Tel.…”

Section: Introductionmentioning

confidence: 99%

The aggregation and diffusion of asphaltenes studied by GPU-accelerated dissipative particle dynamics

Wang

Wen

2014

Computer Physics Communications

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Section: Introductionmentioning

confidence: 99%

The aggregation and diffusion of asphaltenes studied by GPU-accelerated dissipative particle dynamics

Wang

Wen

2014

Computer Physics Communications

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“…Recent studies have suggested that asphaltenes might aggregate at concentrations of 10-100 mg/l. [34][35][36] However, the diffusion coefficients of the SFEF cuts in this study do not vary even at concentrations up to 20 g/l. This implies that the molecules of the SFEF cuts might not aggregate under the conditions of our experiments.…”

Section: Effective Diffusion Coefficientsmentioning

confidence: 56%

Hindered diffusion of residue narrow cuts through polycarbonate membranes

Chen

Gao

et al. 2010

AIChE Journal

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Hindered diffusion plays an important role in catalytic processing of residue and heavy oil because of large size molecules in these feedstocks. Vacuum residue of Athabasca oil sand bitumen was fractionated into 13 narrow fractions and an end-cut by supercritical fluid extraction and fractionation (SFEF). Diffusion transport of five SFEF cuts through four polycarbonate membranes was investigated using a diaphragm cell at 308 K. The results showed that diffusion coefficients of the five SFEF cuts decreased as the experiment proceeded, which illustrates that these cuts are polydisperse in size. The effective diffusion coefficients varied with molecular size and pore size. Hindered diffusion of the five SFEF cuts is significant in the membranes with nominal pore diameter of 15 nm, which is around the average pore size of typical hydrotreating catalyst. Comparisons between experimental data and theoretical prediction revealed that the actual hindered degree for diffusion of the five SFEF cuts is higher than that calculated by the Renkin equation. There were slight differences in diffusivity among saturate, aromatic, and resin constituents.

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“…We directly observed primary aggregation of asphaltenes for the first time in studies of the viscosity, NMR relaxation, and optical absorption of solutions of crude and solid asphaltenes in toluene [11][12][13]. These results were confirmed in studying solutions of asphaltenes by fluorescence spectroscopy [14].…”

mentioning

confidence: 57%

Features of analysis of associative hydrocarbon media. Applicability of refractometric methods

Evdokimov

Losev

2007

Chem Technol Fuels Oils

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The refractive index and optical absorption of solutions of crude oil in toluene were investigated. It was found that the optical properties of systems with an extremely low content of macromolecular substances deviate significantly from Bouguer -Lambert -Beer and other laws. The sensitivity of the refractive index to association of the macromolecular components of hydrocarbon systems was revealed. To increase the accuracy of the analysis, the necessity of a detailed study of the optical properties of associative hydrocarbon systems before plotting calibration curves was demonstrated.Refractometric methods of assessing product quality and composition are widely used in petrochemistry, and the refractive index of petroleum refining products is a quantity regulated by state standards. For this reason, great importance is attributed to the reliability of determining the broad spectrum of properties based on the refractive index.In recent years, instrument-building companies have proposed flow analyzers for monitoring product quality in oil refineries (OR). Many domestic OR -Yaroslavl', Kirishsk, Omsk, etc. -have already introduced systems for monitoring product quality and production processes that include automated instruments -flow analyzers.The analyzers (photometers and prismatic refractometers) are equipped with a built-in microprocessor or external computer which allows obtaining information on the manufacturing process in real time. The principle of action of most of these instruments -the flow refractometer -is based on measuring the refractive index of the medium at a certain wavelength or taking the refractometric spectrum. The instruments are tuned for operation in the visible or UV regions of the spectrum. Linear calibration curves are used to interpret the data.

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Asphaltene dispersions in dilute oil solutions

Cited by 50 publications

References 33 publications

The aggregation and diffusion of asphaltenes studied by GPU-accelerated dissipative particle dynamics

The aggregation and diffusion of asphaltenes studied by GPU-accelerated dissipative particle dynamics

Hindered diffusion of residue narrow cuts through polycarbonate membranes

Features of analysis of associative hydrocarbon media. Applicability of refractometric methods

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