Continuous solvent extraction of decant, cycle and gas oils

Claim 1

A SOLVENT EXTRACTION PROCESS FOR TREATING HYDROCARBON FEED TO OBTAIN A SEPARATE PORTION OF AROMATIC HYDROCARBONS HAVING NITROGEN AND METALLIC CONSTITUENTS SUITABLE FOR CARBON BLACK FEEDSTOCK AND A SEPARATE PORTION OF NONASPHALTIC, NONAROMATIC HYDROCARBONS SUBSTANTIALLY FREE OF NITROGEN AND METALLIC COMPONENTS AND SUITABLE FOR CATALYTIC CRACKING, SAID PROCESS COMPRISING: (A) INITMATELY CONTACTING A FIRST HYDROCARBON FEED HAVING AN INITIAL BOILING POINT OF AT LEAST 450*F. AND CONTAINING 50% TO 85% (VOL.) HEAVY CYCLE OIL, 50% TO 15% (VOL.) DECANT OIL, SAID HYDROCARBON FEED COMPRISING A MIXTURE OF 50% TO 80% (WT.) AROMATIC HYDROCARBONS, 20% TO 50% (WT.) NONAROMATIC HYDROCARBONS AND CONTAINING SIGNIFICANT QUANTITIES OF NITROGEN AND METALLIC CONSTITUENTS WITH A FIRST SOLVENT FOR SAID AROMATIC HYDROCARBONS, THEREBY FORMING A FIRST EXTRACT PHASE CONTAINING A MAJOR PORTION OF SAID FIRST SOLVENT, A MAJOR PORTION OF SAID AROMATIC HYDROCARBONS, AND A MAJOR PORTION OF SAID NITROGEN AND METALLIC CONSTITUENTS AND A FIRST RAFFINATE PHASE CONTAINING A MINOR PORTION OF SAID FIRST SOLVENT, A MINOR PORTION OF SAID AROMATIC HYDROCARBONS, A MINOR PROPORTION OF SAID NITROGEN AND METALLIC CONSTITUENTS, AND A MAJOR PORTION OF SAID NONAROMATIC HYDROCARBONS; (B) SEPARATING SAID FIRST EXTRACT PHASE FROM SAID FIRST RAFFINATE PHASE; (C) INTIMATELY CONTACTING A SECOND HYDROCARBON FEED COMPRISING A SUBSTANTIALLY ASPHALTENE-FREE GAS OIL HAVING AN INITIAL BOILING POINT OF AT LEAST ABOUT 450* F. AND CONTAINING FROM ABOUT 10% TO ABOUT 20% (WT) AROMATIC HYDROCARBONS, FROM ABOUT 80% TO ABOUT 90% (WT) NONAROMATIC HYDROCARBONS AND NITROGEN AND METALLIC CONSTITUENTS WITH AT LEAST A PORTION OF SAID FIRST EXTRACT PHASE AND ADDITIONAL QUANTITIES OF SAID SOLVENT, THEREBY FORMING A SECOND EXTRACT PHASE CONTAINING A MAJOR PORTION OF SAID FIRST SOLVENT, A MAJOR PORTION OF SAID ADDITIONAL SOLVENT, A MAJOR PORTION OF SAID AROMATIC HYDROCARBONS, AND A MAJOR PORTION OF SAID NITROGEN AND METALLIC CONSTITUENTS FROM SAID FIRST AND SECOND HYDROCARBON FEEDS AND A SECOND RFFINATE PHASE CONTAINING A MINOR PORTION OF SAID SOLVENTS, A MINOR PORTION OF SAID NITROGEN AND METALLIC CONSTITUENTS, AND A MAJOR PORTION OF NONAROMATIC HYDROCARBONS FROM SAID SECOND HYDROCARBON FEED; (D) SEPARATING SAID SECOND EXTRACT PHASE FROM SAID SECOND RAFFINATE PHASE; (E) REMOVING THE MAJOR PORTION OF SOLVENT FROM SAID SECOND EXTRACT PHASE, THEREBY RECOVERING AN AROMATIC CONCENTRATE CONTAINING A MAJOR PORTION OF SAID NITROGEN AND METALLIC CONSTITUENTS AND SUITABLE AS CARBON BLACK FEEDSTOCK; AND (F) REMOVING SOLVENT FROM SAID FIRST AND SECOND RAFFINATE PHASES, THEREBY RECOVERING A MIXTURE OF PREDOMINANTLY NONAROMATIC HYDROCARBONS SUBSTANTIALLY FREE OF NITROGEN AND METALLIC CONSTITUENTS AND SUITABLE FOR CATALYTIC CRACKING FEEDSTOCK.