Distribution of Average Molecular Weight and Average Structural Parameters of Oil Produced by Coal Hydrogenolysis under High Pressure

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The chemical constitution of oil produced by Yubari coal hydrogenolysis under high pressure was studied. Hydrogenolysis of Yubari coal was carried out under 200-220kg/cm<SUP>2</SUP> hydrogen pressure at 390-410°C for three hours with no vehicle. Oil was obtained in about a 30% yield on the basis of Yubari coal (d. a. f.). The oil was fractionated by three different methods, namely, solvent fractionation, fractionation by adsorption on alumina and gradient elution adsorption chromatography (GEAC).<BR>The average structural parameters of each fraction were estimated by ultimate analysis, IR-and UV-spectra, average molecular weight determination by vapor pressure osmometry and hydrogen distribution by high resolution NMR.<BR>The results on the basis of the structural analysis of each fraction were as follows: -(1) Oil seems to consist of paraffinic, naphthenic acid aromatic constituents.(2) The average molecular weight of fractions ranged from 180 to 1210.(3) The aromaticity (fa) of the fractions showed from 0.00 corresponding to aliphatics only, up to 0. 73.(4) The parameter of condensed aromatic ring (Hau/Ca) of the fractions varied from 0.69 to 1.00 which correspond to a five to one condensed aromatic ring system.(5) The parameter of the length of alkyl side chain (Ho/Hc) was 0.5 to 4.1 corresponding to that of the alkyl side chain which had approximately 2 to 5 carbon atoms.
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