Chemical structures of nonpolar fraction in wandoan coal-derived heavy oil.
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The chemical structures of the nonpolar fraction in Wandoan-coal derived heavy oil were investigated by Field-ionization mass spectrometry (FIMS)<BR>The nonpolar fraction of the heavy oil were separated into five compound-type classes by high-performance liquid chromatography (HPLC). The FIMS analyses of those compound-type subfractions indicated that the skeltal structures were polycondensed aromatic rings which had molecular weights represented by 228+50n, 202+50n, 204+50n, 276+50n (n=0, 1, 2, 3, 4). A small amount of n-paraffins was also contained.<BR>Naphthalenes with long alkyl chains, binaphtyls and their hydrogenated compounds were also detected in significant amounts, and they were supposed to be formed by recombination of solvent with alkyl radical and dimerization of solvent, respectively. The occurence of these recombination reaction implyed that a part of polycondensed aromatic rings might be formed during coal liquefaction.
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