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

Author

Listed:
  • Francis Nsiah

    (College of Agriculture and Natural Sciences, Ghana.)

  • Seth K. Fiafor

    (College of Agriculture and Natural Sciences, Ghana.)

  • Subir Bhattacharjee

    (IntelliFlux Control, USA.)

Abstract

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 ( 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.

Suggested Citation

Handle: RePEc:epw:ejchem:v:3:y:2022:i:2:id:5109
DOI: 10.24018/ejchem.2022.3.2.109
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