Abstract
A semiquantitative derivatization/NMR method for analysis of sulfur compounds in petroleum is described. The method relies on the conversion of sulfur compounds to their corresponding methylsulfonium salts following by 13 C NMR analysis. The signals of the methyl carbons are then matched to those of the model sulfoniun salts. The initial results using a high sulfur crude petroleum are presented. The 13 C NMR spectra of the S-methylated crude are consistent with a large proportion of thiophenic structures in this crude. Dibenzothiophene-type, benzonaphthothiophene-type, and naphthothiopene-type structures are tentatively identified in the crude. Quantitative 13 C NMR analysis of the methylated crude shows that about 75-80 % of the sulfur functions in the crude are methylated to methylsulfonium salts
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