Abstract
The coupling of simulated distillation by gas chromatography with mass spectrometry has been applied to the characterization of the products obtained by hydroconversion of a deasphalted vacuum residue, performed either in thermal, non-catalytic conditions, or in the presence of various dispersed catalysts. Applying spectra deconvolution techniques, the relative contribution of four saturated and four aromatic classes of hydrocarbons to the spectra is obtained and simulated distillation-mass spectrometry coupling provides the distribution of these classes of compounds along the distillation profile of the products. The impact of catalysts upon the distribution of the considered calsses of hydrocarbons has been evidenced. It consists in a reduction of aromatics and an increase of saturates. This analytical data can be rationalized and correlated with hydrogen distribution during hydroconversion, indicating that the role of catalysts does not consist in a simple hydrogenation of aromatics but in a complete redistribution of hydrogen. Coupled simulated distillation-mass spectrometry appears to be a valuable tool for a fast analytical characterization of complex hydroconversion products, without the need for previous separation steps.
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