Hydrocarbon solvent refining process

Claim 1

A METHOD OF TREATING A HYDROCARBON OIL WHEREIN SAID OIL IS CONTACTED WITH A SELECTIVE SOLVENT COMPRISING FURFURAL IN A FIRST SOLVENT EXTRCTION ZONE UNDER CONDITIONS FORMING A FIRST RAFFINATE PHASE AND A FIRST EXTRACT-MIXPHASE, WHICH COMPRISES WITHDRAWING SAID FIRST EXTRACT-MIX PHASE AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 140 TO 240*F., COOLING SAID FIRST EXTRACT-MIX PHASE TO A TEMPERATURE WITHIN THE RANGE OF ABOUT 90 TO 120*F., SEPARATING A SECOND RAFFINATE COMPRISING HYDROCARBON OIL EXTRACT AND DISSOLVED SOLVENT AND A SECOND EXTRACT-MIX PHASE COMPRISING SOLVENT AND REMAINING HYDROCARBON EXTRACT OIL, CONTACTING SAID SECOND EXTRACT-MIX PHASE WITH A LIQUID PARAFFIN HYDROCARBON FRACTION BOILING WITHIN THE RANAGE OF ABOUT -44 TO 500*F. AND HAVING AN END POINT OF LEAST 100*F. BELOW THE INITIAL BOILING POINT OF SAID HYDROCRABON OIL IN A SECOND EXTRACTION ZONE FORMING A THIRD RAFFINATE PHASE COMPRISING SAID SELECTIVE SOLVENT AND A THIRD EXTRACT-MIX PHASE COMPRISING SAID REMAINING HYDROCRABON OIL AND SAID LOW BOILING HYDROCARBON, RECYCLING AT LEAST A PART OF SAID THIRD RAFFINATE PHASE TO SAID FIRST SOLVENT EXTRACTION ZONE AS AT LEAST A PORTION OF SAID SELECTIVE SOLVENT, SEPARATING HYDROCARBON EXTRACT OIL FROM SAID SECONDARY RAFFINATE, AND SEPARATING REMAINING HYDROCARBON OIL EXTRACT FROM SAID THIRD EXTRACT-MIX.

Claim 2

A METHOD OF TREATING A HYDROCARBON OIL WHEREIN SAID OIL IS CONTACTED WITH A SELECTIVE SOLVENT COMPRISING FURFURAL IN A FIRST SOLVENT EXTRCTION ZONE UNDER CONDITIONS FORMING A FIRST RAFFINATE PHASE AND A FIRST EXTRACT-MIXPHASE, WHICH COMPRISES WITHDRAWING SAID FIRST EXTRACT-MIX PHASE AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 140 TO 240*F., COOLING SAID FIRST EXTRACT-MIX PHASE TO A TEMPERATURE WITHIN THE RANGE OF ABOUT 90 TO 120*F., SEPARATING A SECOND RAFFINATE COMPRISING HYDROCARBON OIL EXTRACT AND DISSOLVED SOLVENT AND A SECOND EXTRACT-MIX PHASE COMPRISING SOLVENT AND REMAINING HYDROCARBON EXTRACT OIL, CONTACTING SAID SECOND EXTRACT-MIX PHASE WITH A LIQUID PARAFFIN HYDROCARBON FRACTION BOILING WITHIN THE RANAGE OF ABOUT -44 TO 500*F. AND HAVING AN END POINT OF LEAST 100*F. BELOW THE INITIAL BOILING POINT OF SAID HYDROCRABON OIL IN A SECOND EXTRACTION ZONE FORMING A THIRD RAFFINATE PHASE COMPRISING SAID SELECTIVE SOLVENT AND A THIRD EXTRACT-MIX PHASE COMPRISING SAID REMAINING HYDROCRABON OIL AND SAID LOW BOILING HYDROCARBON, RECYCLING AT LEAST A PART OF SAID THIRD RAFFINATE PHASE TO SAID FIRST SOLVENT EXTRACTION ZONE AS AT LEAST A PORTION OF SAID SELECTIVE SOLVENT, SEPARATING HYDROCARBON EXTRACT OIL FROM SAID SECONDARY RAFFINATE, AND SEPARATING REMAINING HYDROCARBON OIL EXTRACT FROM SAID THIRD EXTRACT-MIX.