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vol.39 número1SYNTHESIS AND BIOLOGICAL ACTIVITY OF NEW SERIES OF ORGANOTIN(IV) ESTERS WITH N,N-DIACETYLGLYCINEESTUDO FITOQUÍMICO, ATIVIDADE ANTIMICROBIANA E CITOTÓXICA DE ESPÉCIMES DE Leonotis nepetifolia L. R. (Br) índice de autoresíndice de assuntospesquisa de artigos
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Química Nova

versão impressa ISSN 0100-4042versão On-line ISSN 1678-7064

Resumo

FERREIRA, Silas R. et al. COMPARISON BETWEEN ASPHALTENES (SUB)FRACTIONS EXTRACTED FROM TWO DIFFERENT ASPHALTIC RESIDUES: CHEMICAL CHARACTERIZATION AND PHASE BEHAVIOR. Quím. Nova [online]. 2016, vol.39, n.1, pp.26-31. ISSN 1678-7064.  https://doi.org/10.5935/0100-4042.20150172.

Asphaltenes are blamed for various problems in the petroleum industry, especially formation of solid deposits and stabilization of water-in-oil emulsions. Many studies have been conducted to characterize chemical structures of asphaltenes and assess their phase behavior in crude oil or in model-systems of asphaltenes extracted from oil or asphaltic residues from refineries. However, due to the diversity and complexity of these structures, there is still much to be investigated. In this study, asphaltene (sub)fractions were extracted from an asphaltic residue (AR02), characterized by NMR, elemental analysis, X-ray fluorescence and MS-TOF, and compared to asphaltene subfractions obtained from another asphaltic residue (AR01) described in a previous article. The (sub)fractions obtained from the two residues were used to prepare model-systems containing 1 wt% of asphaltenes in toluene and their phase behavior was evaluated by measuring asphaltene precipitation onset using optical microscopy. The results obtained indicated minor differences between the asphaltene fractions obtained from the asphaltic residues of distinct origins, with respect to aromaticity, elemental composition (CHN), presence and content of heteroelements and average molar mass. Regarding stability, minor differences in molecule polarity appear to promote major differences in the phase behavior of each of the asphaltene fractions isolated.

Palavras-chave : asphaltene extraction; asphaltene characterization; asphaltene phase behavior; asphaltene precipitation.

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