Fractionation and Molecular Analysis of a Vacuum Residue Asphaltenes
نویسنده
چکیده
/ Petroleum asphaltenes are defined as the n-pentane or n-heptane insoluble but toluene soluble fraction of crude oils or petroleum residua. This operational definition is a consequence of the extremely complex structure of asphaltenes which consist of thousands of compounds containing highly aromatic cores, long chain aliphatic groups, heteroatoms (sulfur, nitrogen, and oxygen) as well as trace quantities of heavy metals (vanadium and nickel). Therefore, it is extremely difficult to elucidate the molecular structure of petroleum asphaltenes.
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