Patents

A process for production of low ulfur residual fuel oil (sulfur content less than 2 weight %) from complex heavy end residues of  petroleum hydrocarbons such as vacuum residue (VR) containing Sulfur compound around 5 weight % through dilution of the stream  with light paraffinic solvent and extracting the sulfur compounds from oil phase and finally desulfurized stream using a polar selective  solvent such as aqueous NMP, Furfural and Di-methyl formamide (DMF).