Soluble fractions of petroleum vacuum residues (JVR and HVR Indian crude oils) were characterized for hydrocarbon group type analysis using HPLC and boiling point distribution using high temperature GC (HTGC). JVR showed higher temperatures for almost all the cut points compared to HVR, which was due to heavy nature of JVR having more of high boiling components. The polars and insolubles decreased in the order: residue > C7S > EAS > C6S > C7C5S > EAC5S, showing the effectiveness of insolubles removal in the same order. Partial separation of monoaromatics, diaromatics, triaromatics, tetraromatics, pentaromatics, and polars was achieved using the flow and solvent (n-hexane and dichloromethane) gradient program, two chemically bonded silica - NH2 columns in series and different wavelengths of UV detector. The dominant aromatic compounds existed as 3-5 ring aromatic hydroaromatic compounds, which account for more than half of the aromatic compounds. The HPLC and HTGC method developed and standardized were fast, simple, accurate and suitable as first step to characterize residues and feeds used for conversion processes, thus making them an attractive and indispensable tool for the operation and control of secondary conversion processes.
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