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- W1991459916 abstract "Asphaltene samples of different origins (Boscan, Safaniya and Aramco) were treated in different ways, and the amount of porphyrinic metal in each sample was measured by u.v.-visible spectroscopy. The low concentration of porphyrinic vanadium detected by this technique was explained by the presence of aggregates in the asphaltene solutions. The size distribution of the heterogeneous particles in asphaltene solutions was determined by SAXS (small angle X-ray scattering). Each scattering curve was analysed with a particle size distribution programme, and the corresponding histograms are shown. A study of asphaltenic solutions under similar conditions shows that visbreaking is characterized by the presence of large particles in asphaltenic solutions, while only small particles are present after hydrotreatment." @default.
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- W1991459916 date "1990-01-01" @default.
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- W1991459916 title "Microheterogeneity study of heavy crude petroleum by u.v.-visible spectroscopy and small angle X-ray scattering" @default.
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- W1991459916 doi "https://doi.org/10.1016/0016-2361(90)90260-w" @default.
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