STABLE CARBON-ISOTOPE ANALYSIS OF HEAVY OILS

Stable carbon isotope analysis of various heavy oils and some thermo-c atalytically converted products was performed with a thermal analyser coupled with an isotopic ratio mass spectrometer. The temperature-prog rammed oxidative pyroanalysis technique subdivides the classical C-13/ C-12 ratio, affording new insights into the structural composition of heavy oils such as the contribution of naphthenoaromatics, and appears to be of interest for following their thermal refining.