Separation and characterization of asphaltenic subfractions

Química Nova

Ferreira, Silas R.¹  Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil¹  Lucas, Elizabete F.¹  Centro de Pesquisas da PETROBRAS, Rio de Janeiro, Brasil¹  Mansur, Claudia R. E.¹  González, Gaspar¹  Honse, Siller O.¹ 

关键词: crude oil;    asphaltenes;    characterization.;   

DOI  :  10.1590/S0100-40422012001000019

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

The structure of the various asphaltenic subfractions found in crude oil was evaluated. For this purpose, C5 asphaltenes were extracted from an asphaltic residue using n-pentane as the flocculant solvent. The different subfractions were isolated from the C5 asphaltenes by the difference in solubility in different solvents. These were characterized by infrared spectroscopy, nuclear magnetic resonance, X-ray fluorescence, elementary analysis and mass spectrometry. The results confirmed that the subfractions extracted with higher alkanes had greater aromaticity and molar mass. However, small solubility variations between the subfractions were attributed mainly to the variation in the concentrations of cyclical hydrocarbon compounds and metals.

【 授权许可】

Unknown