Taking three kinds of asphalts as research object,the n-pentane asphaltene(As-5)was separated from asphalts,then n-heptane asphaltene(As-7)and heavy resin were separated from n-pentane asphaltene(As-5).N-pentane asphaltene(As-5),n-heptane asphaltene(As-7)and heavy resin were characterized by elemental analysis(EA),gel chromatography(GPC)and 1H-nuclear magnetic resonance spectrum(1H NMR),respectively.The results showed that n-heptane asphaltene(As-7)had the largest C/H atomic number ratio,molecular weight Mw and large/small molecular weight ratio(LMS/SMS),as well as the largest aromatic carbon ratio fA,the degree of aromatic ring condensation and the molecular weight of structural unit.The heavy resin had the lowest C/H atomic number ratio,molecular weight Mw and large/small molecular weight ratio(LMS/SMS),as well as the lowest aromatic carbon ratio fA,the degree of aromatic ring condensation and the molecular weight of structural unit.The above average structural parameters of n-pentane asphaltene were between the seprated heptane asphaltane and heavy resin.On the basis of these characterization results,the solubility parameters δ of these components were calculated,and the relationship between the average molecular structure of these components and the solubility parameters δ was analyzed.
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