a significant savings in capital investment chemical usage catalyst and hydrogen and energy usage solvents that are used in the claimed invention are chosen based upon whether they extrac sulfur and rejecting olefins in the fcc gasoline also the boiling point of the ed solvents should be high enough to be recovered in the solvent stripper and not to contaminate the extracted products the non limiting solvent examples include sulfolane 3 methylsulfolane 2 4 dimethylsulfolane 3 ethylsulfolane n methyl pyrrolidone 2 pyrrolidone n ethyl pyrrolidone n propyl pyrrolidone n formyl morpholine dimethylsulfone diethylsulfone methylethylsulfone dipropylsulfone dibutylsulfone tetraethylene glycol triethylene glycol dimethylene glycol ethylene glycol ethylene carbonate propylene carbonate and mixtures thereof the presently preferred solvents are sulfolane 3 methylsulfolane n formyl morpholine 2 pyrrolidone dipropylsulfone tetraethylene glycol and mixtures thereof in the process according to an embodiment of the invention the extractive solvent includes a co solvent for example a preferred solvent comprises sulfolane with 3 methylsulfolane n formyl morpholine 2 pyrrolidone dipropylsulfone tetraethylene glycol water heavy sulfur residuals from fcc gasoline or mixtures thereof as a co solvent feedstocks fcc gasoline contains many different types of sulfur species including without limitation mercaptans sulfides disulfides thiophenes and benzothiophenes table 1 illustrates the commonly observed sulfur compounds that are extracted from hydrocarbon feedstocks using processes of the invention along with their normal boiling points in an alternate embodiment of the claimed invention impurity and sulfur removal is carried out by using divided wall distillation in the solvent recovery process this is shown in.