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- W1989918920 abstract "ABSTRACT The chemical compositions of, and structural types in, vacuum residues from Daqing, Shengli, Renqiu and Linpan crude oil vacuum residues were investigated. The residues were separated into six fractions by use of normal pentane precipitation and liquid adsorption chromatography using alumina containing 5% water as adsorbent. The nitrogen and nickel distributions in every fraction were then observed. The removal of nickel, nitrogen and residual carbon with the liquid chromatography separation techniques are comparable with the solvent deasphalting pilot plant data. The structural parameters were calculated with modified Brown-Ladner's method on the basis of elementary analysis, molecular weight determination and 1H-NMR spectroscopy, the results obtained show that the six fractions are obviously different in their chemical compositions and structures." @default.
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- W1989918920 date "1988-01-01" @default.
- W1989918920 modified "2023-09-27" @default.
- W1989918920 title "CHARACTERIZATION OF VACUUM RESIDUES BY ADSORPTION CHROMATOGRAPHY AND<sup>1</sup>H-NMR SPECTROSCOPY" @default.
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- W1989918920 doi "https://doi.org/10.1080/08843758808915896" @default.
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