Multicatalyst dehydrogenation, single catalyst decontamination and aromatization

Claim 1

A METHOD OF PRETREATING AND REFORMING NAPHTHA WHICH COMPRISES FLOWING HOT, ACTIVE, NITROGEN-INSENTIVE, SULFUR-INSENSITIVE PARTICLE-FORM FIRST REFORMING CATALYST SUCCESSIVELY THROUGH A FIRST REACTION ZONE AND A THIRD REACTION ZONE, SAID PARTICLE-FORM FIRST REFORMING CATALYST HAVING HYDRODECONTAMINATING CAPABILITIES, AT LEAST ONE COMPONENT OF SAID FIRST REFORMING CATALYST FORMING A SULFIDE STABLE UNDER THE CONDITIONS OF TEMPERATURE AND HYDROGEN PARTIAL PRESSURE IN SAID FIRST REACTION ZONE AND OXIDIZABLE TO A GASEOUS SULFUR COMPOUND DURING REGENERATION, IN SAID FIRST REACTION ZONE CONTACTING SAID FLOWING FIRST REFORMING CATALYST WITH FEED NAPHTHA CONTAINING MORE THAN 1 P.P.M. OF NITROGEN AT A TEMPERATURE OF AT LEAST 800*F. TO OBTAIN A FIRST REACTION ZONE EFFLUENT COMPRISING AMMONIA, HYDROGEN SULFIDE, HYDROGEN, AND C1 AND HEAVIER HYDROCARBONS, IN A SECOND REACTION ZONE CONTACTING AT LEAST THE C5 AND HEAVIER HYDROCARBONS OF SAID FIRST REACTION ZONE EFFLUENT WITH PARTICLE-FORM NITROGEN-SENSITIVE PLATINUM-GROUP METAL IN THE PRESENCE OF HYDROGEN AND NOT MORE THAN 1 P.P.M. OF NITROGEN BASED UPON THE NAPHTHA FEED TO SAID FIRST REACTION ZONE UNDER REFORMING CONDITIONS OF TEMPERATURE, PRESSURE, AND LIQUID HOURLY SPACE VELOCITY TO DEHYDROGENATE AT LEAST 85 PERCENT OF THE NAPHTHENES IN THE NAPHTHA FEED TO SAID FIRST REACTION ZONE TO AROMATICS TO OBTAIN A SECOND REACTION ZONE EFFLUENT COMPRISING HYDROGEN, AND C5 AND HEAVIER AROMATICS AND PARAFFINS, IN THE AFORESAID THIRD REACTION ZONE, WITHOUT SEPARATION OF ANY SUBSTANTIAL PORTION OF SAID REACTION ZONE EFFLUENT, CONTACTING SUBSTANTIALLY ALL OF SAID SECOND REACTION ZONE EFFLUENT WITH SAID PARTICLE-FORM FIRST REFORMING CATALYST DISCHARGED FROM SAID FIRST REACTION ZONE AT SUBSTANTIALLY PARAFFIN DEHYDROCYCLIZING TEMPERATURE UNDER PARAFFIN DEHYDROCYCLIZING CONDITIONS OF TEMPERATURE, PRESSURE, AND CATALYST-TO-OIL RATIO TO DEHYDROCYCLICIZE PARAFFINS IN SAID SECOND REACTION ZONE EFFLUENT AND TO SUBSTANTIALLY COMPLETE DEHYDROGENATION OF NAPHTHENES IN SAID SECOND REACTION ZONE EFFLUENT TO OBTAIN A THIRD REACTION ZONE EFFLUENT, COOLING SAID THIRD REACTION ZONE EFFLUENT TO A TEMPERATURE AT WHICH C4 AND HEAVIER HYDROCARBONS CONDENSE, SEPARATING UNCONDENSED THIRD REACTION ZONE EFFLUENT COMPRISING HYDROGEN AND C1 TO C3 HYDROCARBONS FROM CONDENSED C4 AND HEAVIER HYDROCARBONS, AND RECYCLING SAID UNCONDENSED THIRD REACTION ZONE EFFLUENT TO AT LEAST SAID FIRST REACTION ZONE.

Claim 2

A METHOD OF PRETREATING AND REFORMING NAPHTHA WHICH COMPRISES FLOWING HOT, ACTIVE, NITROGEN-INSENTIVE, SULFUR-INSENSITIVE PARTICLE-FORM FIRST REFORMING CATALYST SUCCESSIVELY THROUGH A FIRST REACTION ZONE AND A THIRD REACTION ZONE, SAID PARTICLE-FORM FIRST REFORMING CATALYST HAVING HYDRODECONTAMINATING CAPABILITIES, AT LEAST ONE COMPONENT OF SAID FIRST REFORMING CATALYST FORMING A SULFIDE STABLE UNDER THE CONDITIONS OF TEMPERATURE AND HYDROGEN PARTIAL PRESSURE IN SAID FIRST REACTION ZONE AND OXIDIZABLE TO A GASEOUS SULFUR COMPOUND DURING REGENERATION, IN SAID FIRST REACTION ZONE CONTACTING SAID FLOWING FIRST REFORMING CATALYST WITH FEED NAPHTHA CONTAINING MORE THAN 1 P.P.M. OF NITROGEN AT A TEMPERATURE OF AT LEAST 800*F. TO OBTAIN A FIRST REACTION ZONE EFFLUENT COMPRISING AMMONIA, HYDROGEN SULFIDE, HYDROGEN, AND C1 AND HEAVIER HYDROCARBONS, IN A SECOND REACTION ZONE CONTACTING AT LEAST THE C5 AND HEAVIER HYDROCARBONS OF SAID FIRST REACTION ZONE EFFLUENT WITH PARTICLE-FORM NITROGEN-SENSITIVE PLATINUM-GROUP METAL IN THE PRESENCE OF HYDROGEN AND NOT MORE THAN 1 P.P.M. OF NITROGEN BASED UPON THE NAPHTHA FEED TO SAID FIRST REACTION ZONE UNDER REFORMING CONDITIONS OF TEMPERATURE, PRESSURE, AND LIQUID HOURLY SPACE VELOCITY TO DEHYDROGENATE AT LEAST 85 PERCENT OF THE NAPHTHENES IN THE NAPHTHA FEED TO SAID FIRST REACTION ZONE TO AROMATICS TO OBTAIN A SECOND REACTION ZONE EFFLUENT COMPRISING HYDROGEN, AND C5 AND HEAVIER AROMATICS AND PARAFFINS, IN THE AFORESAID THIRD REACTION ZONE, WITHOUT SEPARATION OF ANY SUBSTANTIAL PORTION OF SAID REACTION ZONE EFFLUENT, CONTACTING SUBSTANTIALLY ALL OF SAID SECOND REACTION ZONE EFFLUENT WITH SAID PARTICLE-FORM FIRST REFORMING CATALYST DISCHARGED FROM SAID FIRST REACTION ZONE AT SUBSTANTIALLY PARAFFIN DEHYDROCYCLIZING TEMPERATURE UNDER PARAFFIN DEHYDROCYCLIZING CONDITIONS OF TEMPERATURE, PRESSURE, AND CATALYST-TO-OIL RATIO TO DEHYDROCYCLICIZE PARAFFINS IN SAID SECOND REACTION ZONE EFFLUENT AND TO SUBSTANTIALLY COMPLETE DEHYDROGENATION OF NAPHTHENES IN SAID SECOND REACTION ZONE EFFLUENT TO OBTAIN A THIRD REACTION ZONE EFFLUENT, COOLING SAID THIRD REACTION ZONE EFFLUENT TO A TEMPERATURE AT WHICH C4 AND HEAVIER HYDROCARBONS CONDENSE, SEPARATING UNCONDENSED THIRD REACTION ZONE EFFLUENT COMPRISING HYDROGEN AND C1 TO C3 HYDROCARBONS FROM CONDENSED C4 AND HEAVIER HYDROCARBONS, AND RECYCLING SAID UNCONDENSED THIRD REACTION ZONE EFFLUENT TO AT LEAST SAID FIRST REACTION ZONE.