SAR-AD Method to Characterize Eight SARA Fractions in Various Vacuum Residues and Follow Their Transformations Occurring during Hydrocracking and Pyrolysis

Model compounds were used to provide some chemical boundaries for the eight-fraction SAR-ADTM characterization method heavy oils. It was found that Saturates fraction consists of linear and highly cyclic alkanes; Aro-1 molecules with a single aromatic ring; Aro-2 mostly 2 3-ring fused molecules, pericondensed 4-ring molecule pyrene, 3–5 rings are not fused; Aro-3 4-membered catacondensed aromatics, larger large polycyclic hydrocarbons. The Resins ring systems containing polar functional groups metallated vanadium oxide porphyrin compounds, Asphaltene both island- archipelago-type structures broad range molecular weight variation, aromaticity, heteroatom contents. behavior eight fractions during hydrocracking pyrolysis investigated, quantitative relations established. Intercriteria analysis evaluation data hydrocracked vacuum residue sediment formation rate in commercial ebullated bed performed. showed total asphaltene content, toluene-soluble asphaltenes, colloidal instability index contribute formation, while Cyclohexane-soluble asphaltenes had no statistically meaningful relation studied operation conditions.