Coke oven light oil purification

Claim 1

THE PROCESS FOR THE PURFICATION OF COKE OVEN LIGHT OIL CONTAMINATED WITH NON-AROMATIC HYDROCARBONS AND SULFUR COMPOUNDS, WHICH COMPRISES PREHEATING SUCH OIL TO A TEMPERATURE OF AT LEAST 1050* F., INTRODUCING SAID PREHEATED OIL INTO A REACTION ZONE TO CONTACT WITH A CHROMIA ON ALUMINA CATALYST IN WHICH SAID ALUMINA CONTAINS 0.5 TO ABOUT 3% BENTONITE AND SAID CATALYST IN CHARACTERIZED BY A SURFACE AREA OF AT LEAST 50 SQUARE METERS PER GRAM, EFFECTING SAID CONTACT AT A TEMPERATURE IN THE RANGE OF 1110-1170* F., AT A PRESSURE IN THE RANGE OF 400-1000 P.S.I.G., AND IN THE PRESENCE OF ADDED COMPATIBLE GAS IN AN AMOUNT OF AT LEAST 3.1 AND NO GREATER THAN 6.3 MOLAR RATIO, SAID CONTACT AT A TEMPERATURE IN THE RANGE OF TO GIVE A HYDROGEN PARTIAL PRESSURE OF AT LEAST FIFTY PERCENT OF THE TOTAL PRESSURE OF SAID REACTION ZONE; SAID COKE OVEN LIGHT OIL BEING CHARGED TO SAID REACTION ZONE AT A SPACE RATE IN THE RANGE OF 0.1 TO 104 VOLUMES OF OIL (AS LIQUID) PER VOLUME OF CATALYST PER HOUR, THE RESIDENCE TIME FOR SAID OIL IN THE REACTION ZONE BEING AT LEAST 60 SECONDS AND NO MORE THAM 180 SECONDS, RECOVERNING NORMALLY LIQUID HYDROCARBONS FROM THE EFFLUENT FROM SAID REACTION ZONE, TREATING SUCH LIQUIDS HYDROCARBONS TO REMOVE UNSATURATES, AND FRACTIONATING THE SO-TREATED LIQUID HYDROCARBONS TO RECOVER A BENZENE PRODUCT CONTAINING LESS THAN ONE PART PER MILLION OF THIOPHENES.