Solvent extraction process applied to feed stocks of high boiling points

Claim 1

A PROCESS FOR SEPARATING A POLYCYCLIC AROMATIC HYDROCARBON FROM A NON-AROMATIC HYDROCARBON OF APPROXIMATELY OF SAID AROMATIC AND NON-AROMATIC HYDROCARBONS MIXTURE OF SAID AROMATIC AND NON-AROMATIC HYDROCARBONS AT A TEMPERATURE OF FROM ABOUT 75* TO ABOUT 200*C. WITH A SOLVENT COMPRISING AN AQUEOUS SOLUTION OF AT LEAST ONE POLYOXYALKYLENE GLYCOL CAPABLE OF SELECTIVELY DISSOLVING SAID POLYCYCLIC AROMATIC HYDROCARBON, SAID HYDROCARBONS BEING HIGHER BOILING THAN SAID SOLVENT, SEPARATING A RESULTING FAT SOLVENT STREAM COMPRISING SAID SOLVENT AND CONTAINING DISSOLVED STREAM COMPRISING SAID SOLVENT AND CONCARBON FROM A RESULTING PRIMARY RAFFINATE STREAM COMPRISING A NON-AROMATIC HYDROCARBON COMPONENT OF SAID MIXTURE, SEPARATELY CONTACTING SAID FAT SOLVENT STREAM WITH A MONOCYCLIC AROMATIC HYDROCARBON OF GREATER VOLATILITY THAN SAID POLYCYCLIC AROMATIC HYDROCARBON, SEPARATING A RESULTING SECONDARY RAFFINATE STREAM COMPRISING SAID POLYCYCLIC AROMATIC HYDROCARBON DISSOLVED IN AN EXCESS OF SAID MONOCYCLIC AROMATIC HYDROCARBON FROM A SECONDARY FAT SOLVENT STREAM, SUBJECTING SAID SECONDARY FAT SOLVENT STREAM TO DISTILLATION, SEPARATELY RECOVERING REGENERATED SOLVENT AND A MONOCYCLIC AROMATIC HYDROCARBON STREAM, RECYCLING SAID REGENERATED SOLVENT TO SAID FIRST-MENTIONED CONTACTING STEP AND SAID MONOCYCLIC AROMATIC HYDROCARBON TO SAID LAST-MENTIONED CONTACTING STEP, AND SEPARATELY RECOVERING MONOCYCLIC AND POLYCYCLIC AROMATIC HYDROCARBONS FROM SAID SECONDARY RAFFINATE STREAM.