Process for preparing cyclohexane

Claim 1

IN PROCESSES FOR THE PREPARATION OF CYCLOHEXANE BY CATALYTIC HYDROGENATION OF BENZENE CONTAINING SULPHUR COMPOUNDS, THE IMPROVEMENTS COMPRISING IN COMBINATION, THE STEPS OF MIXING BENZENE IN GASEOUS PHASE WITH HYDROGEN, PASSING THE RESULTING GAS MIXTURE OVER A CATALYST CONTAINING A PLATINUM GROUP METAL IN A FIRST REACTION ZONE WHILE MAINTAINING THE PRESSURE AND TEMPERATURE AT A LEVEL WHEREBY SAID BENZENE IS PARTIALLY HYDROGENATED WHILE HYDROGENATING SUBSTANTIALLY THE ENTIRE SULPHUR CONTENT OF SAID SULPHUR COMPOUNDS TO HYDROGEN SULPHIDE, AND SUBSEQUENTLY PASSING THE RESULTING REACTION GASEOUS MIXTURE THROUGH A HYDROGEN SULPHIDE ABSORPTION ZONE WHERE SUBSTANTIALLY ALL OF THE HYDROGEN SULPHIDE IS REMOVED FROM THE SAID REACTION GASEOUS MIXTURE, AND THEREAFTER COMPLETING THE HYDROGENATION OF SAID BENZENE CONTAINING GASEOUS REACTION MIXTURE FROM WHICH HYDROGEN SULPHIDE HAS BEEN REMOVED IN A SECOND REACTION ZONE.