Study on the Aggregation Behaviors of Asphaltene Derived from Low Temperature Coal Tar in Organic Solvents by Absorbance and Fluorescence Spectroscopy

The aggregation behaviors of asphaltene derived from low temperature coal tar (CTA) in tetrahydrofuran (THF) and carbon tetrachloride (CCl 4 ) solvents have been investigated by employing FTIR, absorption and fluorescence spectroscopy (excitation, emission and synchronous spectroscopy). The results...

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Bibliographic Details
Published in:Solid fuel chemistry 2021-12, Vol.55 (Suppl 1), p.S11-S21
Main Authors: Sun, Zhihui, Wu, Yi, Xu, Weixia, Li, Wenhong
Format: Article
Language:English
Subjects:
Agglomeration
Aggregates
Asphaltenes
Carbon tetrachloride
Chemical compounds
Chemistry
Chemistry and Materials Science
Chromophores
Coal tar
Emission analysis
Emission spectra
Excitation spectra
Fluorescence
Low temperature
Physical Chemistry
Solvents
Spectroscopy
Spectrum analysis
Tetrahydrofuran
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Summary:The aggregation behaviors of asphaltene derived from low temperature coal tar (CTA) in tetrahydrofuran (THF) and carbon tetrachloride (CCl 4 ) solvents have been investigated by employing FTIR, absorption and fluorescence spectroscopy (excitation, emission and synchronous spectroscopy). The results indicate that CTA molecule mainly consists of 2–4 rings fused aromatic nucleus and contains multiple chromophores and fluorophores. It presents strong propensity to aggregate. CTA presents similar aggregation behaviors in the two used organic solvents. The concentration of CTA solutions has great influence on its aggregation performance. CTA exists as monomer species in very dilute solution with the concentration lower than ~10 mg/L. The consistent result has been inferred from the analysis of excitation, emission and synchronous spectra that the onset aggregation of CTA occurs at concentration of ~25 mg/L. With the increasing of concentration, CTA aggregates gradually and the smaller aggregates form into larger aggregates at higher concentration. CTA exist as variously aggregated species in THF and CCl 4 solutions at higher concentrations. In addition, the larger CTA aggregates show strong fluorescence quenching effect.
ISSN:0361-5219
1934-8029
DOI:10.3103/S036152192107003X