Selective use of solvent components in solvent dewaxing

Claim 1

THE PROCESS FOR THE REMOVAL OF WAXY CONSTITUENTS FROM A WAXY OIL CONTAINING SAME BY THE USE OF TWO DIFFERENT SOLVENTS, A KETONE ANTI-WAX SOLVENT AND AN AROMATIC OIL SOLVENT, COMPRISING THE STEPS OF CHILLING SAID WAXY OIL, ADDING SUFFICIENT KETONE ANTI-WAX SOLVENT OF SUBSTANTIALLY THE SAME TEMPERATURE TO SAID WAXY OIL TO PRECIPITATE ONLY A PORTION OF SAID WAXY CONSTITUENTS, SUBSEQUENTLY FURTHER CHILLING THE RESULTING MIXTURE OF WAXY OIL, PRECIPITATED WAXY CONSTITUENTS, AND KETONE ANTI-WAX SOLVENT TO A LOWER TEMPERATURE, SUBSEQUENTLY ADDING ADDITIONAL KETONE ANTI-WAX SOLVENT OF SUBSTANTIALLY THE SAME TEMPERATURE AS THE FURTHER-CHILLED MIXTURE TO SAID FURTHERCHILLED MIXTURE TO FURTHER PRECIPITATE SAID WAXY CONSTITUENTS FROM SAID OIL, ADDING TO THE RESULTING MIXTURE SUBSEQUENT TO THE ADDITION OF ALL THE KETONE ANTI-WAX SOLVENT TO BE INTRODUCED ALL OF SAID AROMATIC OIL SOLVENT, SAID AROMATIC OIL SOLVENT BEING INTRODUCED AT SUBSTANTIALLY THE SAME TEMPERATURE AS THE MIXTURE TO WHICH IT IS ADDED, AND SEPARATING THE PRECIPITATED WAXY CONSTITUENTS AT SUBSTANTIALLY THE SAME TEMPERATURE AS SAID AROMATIC OIL SOLVENT FROM THE RESULTING MIXTURE OF OIL, AROMATIC OIL SOLVENT AND KETONE ANIT-WAX SOLVENT.