Type analysis of saturate and olefin in heavy oil obtained from thermal cracking of vacuum residue.

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  • OHSHIMA Yozo
    Department of Fuel Chemistry, Mining College, Akita University
  • YAN Jian-Wei
    Department of Fuel Chemistry, Mining College, Akita University
  • SHINDO Takayoshi
    Department of Fuel Chemistry, Mining College, Akita University
  • OHNUMA Hiroshi
    Department of Fuel Chemistry, Mining College, Akita University

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Other Title
  • 減圧残さ熱分解重質油中の飽和分およびオレフィン分のタイプ分析

Abstract

Saturate and olefin components in the oil obtained from thermal cracking of vacuum residue were analysed by means of field ionization mass spectrometry (FI•MS). Prior to these analyses, open column chromatographic separations of both components using alumina and silver nitrate coated silica gel as stationary phase were carried out. Non-aromatic fraction was separated from the sample oil (b.p. 300-400°C) by means of alumina gel chromatography (Table 1, Fig. 1), and then it was subdivided into saturate and olefin fractions by silica gel (coated with silver nitrate) chromatography (Fig. 2, Fig. 4, Table 4). On the latter chromatography, instead of sample oil, separation of eicosane and 1-eicosene had been tested to make sure the separation condition. Accordingly, chromatographic conditions for most effective saturateolefin separation had been confirmed (Fig. 3). The saturate and olefin fractions thus separated were analysed by means of FI•MS (Figs. 5, 6). Peaks that appeared in the FI-MS spectra were divided into several homologous groups, according to z number in the general formula of CnH2n+z. Probable chemical structures were estimated for each of these groups, considering distinctive features of each fraction. Contents of these types of hydrocarbons in each fraction were estimated by the peak intensities of the spectra (Tables 5, 6).

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