A method for extracting 1 to 4 cycles of heterocyclic compounds and 2 to 5 cycles of polynuclear aromatic hydrocarbons from a hydrocarbon feed is described. The method includes providing a hydrocarbon feedstock containing a crude oil fraction and determining an A / R ratio and an asphaltene concentration of the hydrocarbon feedstock. Based on the A / R ratio and the asphaltene concentration, treatable hydrocarbon feedstocks undergo one or more cracking and fractional distillations. Then, the targeting moiety of at least one of the heterocyclic compounds is extracted from the fractionated stream with an aqueous solvent. A stream containing 2 to 5 cycles of polynuclear aromatic hydrocarbons is transferred to the extractor and 2 to 5 cycles of polynuclear aromatic hydrocarbons are extracted using a solvent system containing an aprotic solvent.
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