Purification of crude benzene

Claim 1

A PROCESS FOR THE PURIFICATION OF CRUDE BENZENE WITHOUT SUBSTANTIALLY CHANGING THE BENZENE WHICH COMPRISES SUBJECTING SAID BENZENE TO A TEMPERATURE BETWEEN ABOUT 180*C. AND ABOUT 450*C. IN THE PRESENCE OF HYDROGEN CONTAINING GASES UNDER A PRESSURE BETWEEN ABOUT 20 AND ABOUT 300 ATMOSPHERES AND IN THE PRESENCE OF A CATALYST OF THE SULFUR-INSESITIVE TYPE COMPRISING AN ACTIVE ALUMINA CATALYST WHICH CONTAINS A COMPOUND SELECTED FROM THE GROUP CONSISTING OF OXIDES AND SULFIDES OF METALS OF THE LEFT SIDE OF THE 6TH GROUP OF THE PERIODIC SYSTEM AND ALSO CONTAINS A COMPOUND SELECTED FROM THE GROUP CONSISTING OF OXIDES AND SULFIDES OF METALS OF THE 8TH GROUP OF THE PERIODIC SYSTEM, WHICH CATALYST HAS BEEN PREPARED BY A PROCESS WHICH COMPRISES PRECIPITATING ALUMINA HYDATE FROM AN ALUMINUM SALT SOLUTION HAVING A PH OF BETWEEN 7 AND ABOUT 10, HEATING THE PRECIPITATE CONTAINING LIQUID TO A TEMPERATURE OF 80*C. TO 100*C. PRIOR TO SEPARATING THE PRECIPITATE, SEPARATING THE PRECIPITATE FROM THE LIQUID WHILE STILL HOT, WASHING THE SEPARATED PRECIPITATE, HEATING THE PRECIPITATE TO 300*C. TO 600*C., AND THEN APPLYING SAID COMPOUNDS TO THE ALUMINA THUS OBTAINED.