A Comprehensive Review on the Significant Tools of Asphaltene Investigation. Analysis and Characterization Techniques and Computational Methods

Hassanzadeh, Masoumeh; Abdouss, Majid

doi:10.2139/ssrn.3888660

Cited by 1 publication

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“…Over the past few decades, investigations into the molecular structure of asphaltenes and their analogs have been carried out using various methodologies ranging from simulations to molecular spectroscopic techniques with a view to unraveling the mystery surrounding the asphaltene moiety [1]- [5]. Spectroscopic techniques ranging from Ultraviolet-Visible (UV-Vis) to Mass Spectrometry (MS) have been utilized to elucidate the structure of asphaltenes and their molecular analogs [6]- [8]. The application of these spectroscopic techniques has provided essential structural details which have served as clues to the actual asphaltene structure which has eluded scientists for years.…”

Section: Introductionmentioning

confidence: 99%

“…The application of these spectroscopic techniques has provided essential structural details which have served as clues to the actual asphaltene structure which has eluded scientists for years. Other techniques such as Gel Permeation Chromatography, Vapour Pressure Osmometry (VPO), X-ray, and neutron small-angle scattering (SANS) [8] have also been employed to deduce the size of polydispersity and the weighted average molecular weight. Most of these techniques require either the adsorption of the sample onto a modified substrate, very dilute asphaltene concentrations, or single solvent systems [5].…”

Section: Introductionmentioning

confidence: 99%

“…Asphaltenes are generally soluble in toluene and insoluble in n-heptane [8], [10]- [13]. Hence, mixed solvent systems may reveal structural characteristics of asphaltene aggregates that may not be noticeable in pure/single solvent systems.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Aggregation Behavior and Molecular Weight Changes of Asphaltene Model Compound

Nsiah

Fiafor²,

Bhattacharjee³

2022

EJCHEM

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We investigate the aggregation of Violanthrone-78 (VO-78), a model asphaltene compound, in mixtures of toluene and n-heptane (heptol) using spectroscopic and dynamic and static light scattering techniques. The light scattering experiments were conducted using pure toluene and n-heptane, as well as 25/75, 50/50, and 75/25 heptol solvents. Furthermore, the concentration of VO-78 varied from 10-8 M to 10-3 M in these suspensions. The dynamic light scattering experiments were used to study the aggregate sizes from the intensity autocorrelation function at different n-heptane volume fractions. The results show the onset of aggregation of about 50 % n-heptane volume fractions. The aggregate sizes in toluene, within the range of concentrations examined, were below the instrument's detection limit (< 5 nm) but increased with increasing dosages of n-heptane. On the other hand, the aggregate size in pure heptane was observed to be greater than the maximum limit of the instrument (> 10 μm). Furthermore, the static light scattering experiments provided an anomalous behavior. Increasing concentrations of VO-78 in the solvent resulted in lowering the parameter Kc/Rq, where c is the molar concentration.

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