Crystallization of polycyclic hydrocarbons

Claim 1

THE PROCESS OF REMOVING CRYSTALLIZABLE POLYCYCLIC HYDROCARBONS FROM HYDROCARBON OIL CONTAINING SUCH COMPOUNDS, WHICH COMPRISES CONTINUOUSLY PROGRESSING HYDROCARBON OIL, INITIALLY AT A TEMPERATURE FROM 90 TO 170* F. THROUGH A PLURALITY OF GENERALLY HORIZONTAL CLOSED CHAMBERS OF A FIRST STAGE AND THERE COOLING THE OIL AND AGITATING THE OIL AND CRYSTALS WHICH FORM BY ROTORS AT A SPEED NOT IN EXCES OF 5 R. P. M. WITH CONTINOUS SCRAPING ADJACENT TO BUT OUT OF CONTACT WITH THE CHAMBER WALLS FOR A TIME IN EXCES OF 8 HOURS, CONTINUOUSLY REMOVING THE CRYSTALS THAT FORM FROM THE OIL BY CENTRIFUGING, THEN CONTINUOUSLY PROGRESSING THE OIL REMAINING AFTER THE REMOVAL OF THE CRYSTALS INITIALLY AT A TEMPERATURE OF BELOW 100* F. THROUGH A PLURALITY OF GENERALLY HORIZONTAL CLOSED CHAMBERS OF A SECOND STAGE AND THERE COOLING THE OIL AND AGITATING THE OIL AND CRYSTALS THAT FORM BY ROTORS AT A SPEED NOT EXCEEDING 5 R. P. M. WITH CONTINUOUS SCRAPING ADJACENT TO BUT OUT OF CONTACT WITH THE CHAMBER WALLS FOR A TIME IN EXCESS OF 8 HOURS, AND CONTINUOUSLY REMOVING THE SECOND STAGE CRYSTALS FROM THE OIL BY CENTRIFUGING, THE PROCESS THROUGHOUT THE FIRST AND SECOND STAGES BEING CARRIED OUT IN A CLOSED SYSTEM.