Pkk. Louie et al., A COMPARISON BY STABLE-ISOTOPE MASS-SPECTROMETRY OF COAL OIL COPROCESSING UNDER SEVERE-HYDROTREATMENT AND THERMAL CONDITIONS, Fuel, 72(11), 1993, pp. 1507-1513
The C-13/C-12 ratios of saturated, aromatic, polar and asphaltene frac
tions produced by coprocessing of Point of Ayr coal with heavy petrole
um residues under severe hydrotreatment conditions were measured by is
otope ratio mass spectrometry. The incorporation of coal carbon into t
he different fractions was assessed after corrections for catalytic hy
drocracking of the end members and for retrogressive reactions. For ar
omatic, polar and asphaltene products, incorporation of coal carbon wa
s similar to that previously observed for thermal coprocessing and was
independent of the oil used. An increase in the saturated fraction du
ring severe hydrotreatment is attributed to hydrothermolysis of bound
long alkyl chains, and is consistent with gas chromatographic analysis
.