Characterization of Asphaltenes from Brazilian Vacuum Residue Using Heptane−Toluene Mixtures
2004; American Chemical Society; Volume: 18; Issue: 6 Linguagem: Inglês
10.1021/ef049960n
ISSN1520-5029
AutoresB. Avid, Shinya Sato, Toshimasa Takanohashi, Ikuo Saito,
Tópico(s)Enhanced Oil Recovery Techniques
ResumoBrazilian vacuum residue (VR) was separated into insoluble and soluble fractions using n-heptane−toluene mixtures (Heptol). Coking tests performed on the soluble fractions showed that asphaltenes vary in regard to the extent to which they form coke. VR asphaltenes were subfractioned into AS 0−10%, AS 10−20%, AS 20−30%, and AS 30−40% by stepwise extraction using Heptol. The AS 20−30% and AS 30−40% fractions had greater aromaticity and a higher proportion of quaternary aromatic carbons, as well as a larger unit size. These type II asphaltenes produced more coke than did type I asphaltenes, which consist of the AS 0−10% and AS 10−20% fractions.
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