Oxidative desulfurization of oil fractions and sulfone management using an FCC

A method of recovering components from a hydrocarbon feedstock, the method comprising:

• supplying the hydrocarbon feedstock to an oxidation reactor, the hydrocarbon feedstock comprising sulfur compounds and nitrogen compounds;
• contacting the hydrocarbon feedstock with an oxidizing agent in the oxidation reactor under conditions sufficient to selectively oxidize sulfur compounds and nitrogen compounds present in the hydrocarbon feedstock to produce an oxidized hydrocarbon stream that comprises hydrocarbons, oxidized sulfur compounds, and oxidized nitrogen compounds;
• separating the hydrocarbons, the oxidized sulfur compounds, and the oxidized nitrogen compounds in the oxidized hydrocarbon stream by solvent extraction with a non-acidic polar organic solvent, the non-acidic polar organic solvent being dimethylformamide, to produce an extracted hydrocarbon stream and a mixed stream, the mixed stream comprising the non-acidic polar organic solvent, the oxidized sulfur compounds, and the oxidized nitrogen compounds, wherein the extracted hydrocarbon stream has a lower concentration of sulfur compounds and nitrogen compounds than the hydrocarbon feedstock;
• separating the mixed stream using a distillation column into a first recovered non-acidic polar organic solvent stream and a first residue stream, the first residue stream comprising the oxidized sulfur compounds and the oxidized nitrogen compounds;
• supplying the first residue stream to a fluid catalytic cracking unit, the fluid catalytic cracking unit being operative to catalytically crack the oxidized sulfur and the oxidized nitrogen to produce regenerated catalyst and gaseous and liquid products and allow for recovery of hydrocarbons from the first residue stream;
• contacting the first residue stream with a fluid catalytic cracking feedstream in the presence of a catalyst to catalytically crack the fluid catalytic cracking feedstream to recover hydrocarbons from the first residue stream;
• supplying the first residue stream contacted with the fluid catalytic cracking feedstream through a hydrotreater prior to supplying the first residue stream to the fluid catalytic cracking unit;
• supplying the extracted hydrocarbon stream to a stripper to produce a second recovered non-acidic polar organic solvent stream and a stripped hydrocarbon stream;
• and
• recycling the first recovered non-acidic polar organic solvent stream and the second non-acidic polar organic solvent stream to an extraction vessel for the separating the hydrocarbons, the oxidized sulfur compounds, and the oxidized nitrogen compounds in the oxidized hydrocarbon stream.