首页|Structural Description of Polyaromatic Nucleus in Residue

Structural Description of Polyaromatic Nucleus in Residue

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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 asphaltenes 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 condensed 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-condensed 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.

proton nuclear magnetic resonance spectroscopysynchronous fluorescence spectrometryruthenium ions catalyzed oxidationresiduestructure

Zhang Huicheng、Yan Yongjie、Sun Wanfu、Wang Jifeng

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Department of Energy Chemical Engineering, East China University of Science and Technology, Shanghai 200237

2007

China petroleum processing & petrochemical technologhy

China petroleum processing & petrochemical technologhy

ISSN：1008-6234
年,卷(期)：2007.(3)