1988 Volume 1988 Issue 2 Pages 181-188
The distillable compounds produced by hydrocracking of thiolignin were analyzed using GC, GC/MS and 'Fl-MS.
Hydrocracking of thiolignin was performed at 450°C under initial hydrogen pressure of 150kg/cm2 using tetralin as a solvent and α-Fe2O3+S as a catalyst. Liquid products were separated by distillation into light (-280°C), middle (280-400°C) distilltes and residue (400°C+). Then the light and middle distillates were separated into acidic, neutral polar and nonpolar fractions (Table 1).
Quantitative an alysis of the acidic fraction in the light distillate by GC and GC/MS showed that monocyclic alkylphenols were main components and bicyclic phenolic compounds such as indanols, tetralinols and naphthols were contained (Fig.3, Table 2).
Three fractions in the middle distillate were characterized b y molecttler ion spectrum method using Fl-MS (Figs.5, 6, 7). The acidic fraction was composed of phenolic compounds with one and two hydroxyl groups, while the neutral polar fraction contains monphenolic compounds with alkyl groups. Results of GC/MS analysis of the dehydrogenated product of the nonpolar fraction showed the presence of polycondensed aromatic's such as phenanthlene, anthracene, pyrene (Fig.8).
From these product ana lysis, it was presumed that the polycondensed ring compounds may be formed during the hydrocracking of thiolignin.
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