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The proton nuclear magnetic resonance spectroscopy(~1H-NMR),the synchronous fluorescence spectrometry(SFS)and the ruthenium ions catalyzed oxidation(RICO)method were used to determine the chemical structure of polyaromatic nucleus in Oman residue fractions.The results of ~1H-NMR analyses showed that the average numbers of aromatic rings in the aromatics,resins and asphaltenes units were 3.2, 5.6 and 8.2,respectively.SFS was used to investigate the distribution of aromatic rings in residue fractions, the main distribution range of aromatic rings in aromatics,resins and asphaitenes were 3—4 rings,3—5 rings and more than 5 rings,respectively.The aromatic network in residue fractions was oxidized to produce numerous carboxylic acids.The types and content of benzenepolycarboxylic acids,such as phthalic acid, benzenetricarboxylic acids,benzenetetracarboxylic acids,benzenepentacarboxylic acid and benzenehexacarboxylic acid disclosed the condensed types of aromatic nuclei in the core.The biphenyl fraction(BIPH),the cata-condensed fraction(CATA),the peri-condensed fraction(PERI)and the con- densed index(BCI)were calculated based on the benzenepolycarboxylic acids formed.The results implied that there was less biphenyl type structures in all residue fractions.The aromatics fraction was almost composed of the cata-condensed type system,and the asphaltenes fraction was wholly composed of the peri-condensed type system,while in the resins fraction co-existed the two types,herein the peri-con- densed type was predominant over the cata-condensed type.Based on the analytical results obtained in the study,the components—aromatics,resins and asphaltenes—were given the likely structural models.
The proton nuclear magnetic resonance spectroscopy (~ 1H-NMR), the synchronous fluorescence spectrometry (SFS) and the ruthenium ion catalyzed oxidation (RICO) method were used to determine the chemical structure of polyaromatic nucleus in Oman residue fractions. The results of ~ 1H -NMR analyzes showed the average numbers of aromatic rings in the aromatics, resins and asphaltenes units were 3.2, 5.6 and 8.2, respectively. FS was used to investigate the distribution of aromatic rings in residue fractions, the main distribution range of aromatic rings in aromatics, resins and asphaitenes were 3-4 rings, 3-5 rings and more than 5 rings, respectively. this aromatic network in residues fractions was oxidized to produce numerous carboxylic acids. types and content of benzene polycarboxylic acids, such as phthalic acid, benzenetricarboxylic acids, benzenetetracarboxylic acids, benzenepentacarboxylic acid and benzenehexacarboxylic acid disclose the condensed types of aromatic nuclei in the core.The b (BIPH), the cata-condensed fraction (CATA), the peri-condensed fraction (PERI) and the con- densed index (BCI) were calculated based on the benzene polycarboxylic acids formed. The results implied that there was less biphenyl type structures in all residue fractions of almost the composition of the cata-condensed type system, and the asphaltenes fraction was wholly composed of the peri-condensed type system, while in the resins fraction co-existed the two types, the the peri -con- densed type was predominant over the cata-condensed type. Based on the analytical results obtained in the study, the components-aromatics, resins and asphaltenes-were given the likely structural models.