Multistage hydrogenative reforming with platinum containing catalysts

Claim 1

THE METHOD OF HYDROGENATIVE REFORMING OF HYDROCARBON CHARGE BOILING IN THE RANGE OF NAPHTHA WHICH COMPRISES INITIALLY DEHYDROGENATING COMPONENTS OF SUCH CHARGE BY PASSING A HYDROGEN-RICH RECYCLE GAS AND SUCH A CHARGE STOCK TOGETHER WITH FROM 0.005 TO 0.1% BY WEIGHT HALOGEN IN THE FORM OF HYDROHALIDE THROUGH A PRIMARY REACTION ZONE MAINTAINED UNDER HYDROGENATIVE REFORMING CONDITIONS INCLUDING A PRESSURE OF FROM 600 TO 700 POUNDS PER SQUARE INCH GAUGE, A TEMPERATURE OF FROM ABOUT 900 TO ABOUT 975*F., THERE BEING AT LEAST 5 VOLUMES OF HYDROGEN PER VOLUME OF GASEOUS NAPHTHA, SAID PRIMARY REACTION ZONE CONTAINING SUPPORTED PLATINUM, THE SUPPORT FOR SAID CATALYST BEING INCAPABLE OF PROMOTING ACIDCATALYZED REACTIONS IN THE PRESENCE OF SUCH HYDROHALIDE, WHEREBY SAID PRIMARY REACTION ZONE DEHYDROGENATES COMPONENTS OF SAID NAPHTHA WITH MINIMIZED CRACKING OF SAID NAPHTHA; AND THEREAFTER PASSING THE EFFUENT FROM SAID PRIMARY REACTION ZONE INTO A SECONDARY REACTION ZONE MAINTAINED AT HYDROGENATIVE REFORMING CONDITIONS INCLUDING TEMPRATURE OF 825-900*F. AND PRESSURE OF 300500 POUNDS PER SQUARE INCH AND CONTAINING CATALYST COMPRISING A SMALL AMOUNT OF PLATINUM SUPPORTED ON AN ALUMINA CARRIER CAPABLE OF BEING ACTIVATED BY HALOGEN TO PROMOTE ACID-CATALYZED REACTIONS, THEREBY EFFECTING ISOMERIZATION AND SELECTIVE CRACKING OF NON-AROMATIC COMPONENTS OF THE EFFLUENT INTRODUCED INTO SAID SECONDARY REACTION ZONE; SEPARATING HYDROGEN-RICH GAS FROM THE REFORMATE DISCHARGED FROM THE SEDONDARY REACTION ZONE, AND RECYCLING SUCH GAS DIRECTLY TO THE PRIMARY REACTION ZONE.

Claim 2

THE METHOD OF HYDROGENATIVE REFORMING OF HYDROCARBON CHARGE BOILING IN THE RANGE OF NAPHTHA WHICH COMPRISES INITIALLY DEHYDROGENATING COMPONENTS OF SUCH CHARGE BY PASSING A HYDROGEN-RICH RECYCLE GAS AND SUCH A CHARGE STOCK TOGETHER WITH FROM 0.005 TO 0.1% BY WEIGHT HALOGEN IN THE FORM OF HYDROHALIDE THROUGH A PRIMARY REACTION ZONE MAINTAINED UNDER HYDROGENATIVE REFORMING CONDITIONS INCLUDING A PRESSURE OF FROM 600 TO 700 POUNDS PER SQUARE INCH GAUGE, A TEMPERATURE OF FROM ABOUT 900 TO ABOUT 975*F., THERE BEING AT LEAST 5 VOLUMES OF HYDROGEN PER VOLUME OF GASEOUS NAPHTHA, SAID PRIMARY REACTION ZONE CONTAINING SUPPORTED PLATINUM, THE SUPPORT FOR SAID CATALYST BEING INCAPABLE OF PROMOTING ACIDCATALYZED REACTIONS IN THE PRESENCE OF SUCH HYDROHALIDE, WHEREBY SAID PRIMARY REACTION ZONE DEHYDROGENATES COMPONENTS OF SAID NAPHTHA WITH MINIMIZED CRACKING OF SAID NAPHTHA; AND THEREAFTER PASSING THE EFFUENT FROM SAID PRIMARY REACTION ZONE INTO A SECONDARY REACTION ZONE MAINTAINED AT HYDROGENATIVE REFORMING CONDITIONS INCLUDING TEMPRATURE OF 825-900*F. AND PRESSURE OF 300500 POUNDS PER SQUARE INCH AND CONTAINING CATALYST COMPRISING A SMALL AMOUNT OF PLATINUM SUPPORTED ON AN ALUMINA CARRIER CAPABLE OF BEING ACTIVATED BY HALOGEN TO PROMOTE ACID-CATALYZED REACTIONS, THEREBY EFFECTING ISOMERIZATION AND SELECTIVE CRACKING OF NON-AROMATIC COMPONENTS OF THE EFFLUENT INTRODUCED INTO SAID SECONDARY REACTION ZONE; SEPARATING HYDROGEN-RICH GAS FROM THE REFORMATE DISCHARGED FROM THE SEDONDARY REACTION ZONE, AND RECYCLING SUCH GAS DIRECTLY TO THE PRIMARY REACTION ZONE.