Browsing by Author "Idris, S."

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    CHARACTERIZATION OF VIRGIN ASPHALTENES AND ITS SUBFRACTIONS USING UV-VISIBLE AND FTIR SPECTROSCOPY
    (School of Physical Sciences, 2017-05-05) Bisiriyu, M. T.; Idris, S.; Garba, H. A.; Yelwa, A. S.; Muhammad, A. B.; Faruq, U. Z.
    Spectroscopic characterization of asphaltene is necessary in order to understand the changes it undergoes when heavy and extra-heavy oil types such as bitumen are subjected to catalytic aquathermolysis. The structural composition of asphaltene and its subfractions were investigated using UV/Visible and FTIR Spectroscopy. Raw bitumen sample was obtained from the bitumen deposit at Mile 2 in Odigbo, Ondo State, Nigeria. The sample was purified and the asphaltene fraction was precipitated with n-hexane, the precipitated asphaltene was fractionated into fractions A and B based on their difference in solubility and polarity with hexane/toluene mixture at a fixed ratio. The results showed that virgin asphaltene and its subfractions absorbed light of longer wavelength in the range (465 640 nm), indicating that they are made up of polynuclear aromatic compounds. The results also revealed the presence of alkyl side chains and major oxygenated groups in both virgin asphaltene and its subfractions (A and B). In general, asphaltene are complex molecular compound which consists of aromatic moieties with alkyl side chains, polar groups (esther, ether and carbonyl), acidic and basic groups (carboxylic and pyridine) which can interact at certain pH range by accepting or donating protons
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    Fractionation and Characterization of Asphaltenic and Resinous Fractions of Natural Bitumen
    (Communication in Physical Sciences, 2020-04-14) Bisiriyu, M. T.; Idris, S.; Aliyu, H. G.; Muhammad, A. B.; Sokoto, A. M.; Abdulkarim, A. M. Abdulkarim
    In order to identify the fingerprints of some fractions in butimen and to study the changes that take place when heavy oil is upgraded, precipitation, fractionation, and characterization of asphaltenes and resins from natural bitumen were carried out using UV/vis and FTIR Spectroscopy. The sample was purified, and the asphaltenes fraction precipitated with n-hexane, fractionated into fractions A and B based on Solubility and polarity with hexane/toluene mixture at a fixed ratio while resins recovered from maltenes was fractionated into subfractions X, Y, Z by liquid adsorption chromatography on a silica/alumina adsorption column with dichloromethane/methanol mixed solvent in the ratio of 4:1, 3:2 and :2:3, respectively. The results showed that crude asphaltene and its subfractions absorbed light of longer wavelength (465 – 640 nm), indicating that they are made up of polynuclear aromatic compounds. The results also revealed the presence of alkyl side chains and major oxygenated groups in both crude asphaltene and its subfractions (A and B). The spectra of crude resin and its subfractions showed that they absorbed radiation of longer wavelength (490-580 nm), which are character of polynuclear aromatic compounds with the extended conjugated system. However, IR spectra revealed that all the fractions including the crude resin contained aromatic rings with alkyl side chains and oxygenated groups.