Temperature control in platinum catalyst reforming

Claim 1

IN A PLATINUM CATALYST NAPHTHA REFORMING SYSTEM INCLUDING LEAD, INTERMEDIATE, AND TAIL REACTION ZONES CONTAINING SAID PLATINUM CATALYST, HEATING ZONES, AND A GAS SEPARATION ZONE, IN WHICH A HYDROGEN-RICH GAS IS SEPARATED FOR RECYCLING, THE METHOD OF BRINGING SAID PLATINUM CATALYST ON-STREAM AT REFORMING TEMPERATURES WHICH COMPRISES PURGING SAID CATALYST WITH FLUE GAS TO REMOVE OXYGEN THEREFROM; PURGING SAID CATALYST FOR ABOUT 0.1 TO 2 HOURS WITH A NON-REACTIVE GAS CONTAINING 0.05 TO 5 MOL. PERCENT SULFUR, SAID GAS BEING SUBSTANTIALLY FREE OF UNCOMBINED HYDROGEN, TO EFFECT REMOVAL OF FLUE GAS FROM SAID CATALYST AND TO CONTACT SAID CATALYST WITH SULFUR; THEREAFTER PURGING SAID CATALYST WITH THE HYDROGEN-RICH SEPARATED GAS; AND CONTACTING SAID CATALYST WITH NAPHTHA VAPORS; WHEREBY HEAT FRONTS DURING INITIAL CONTACT OF SAID CATALYST WITH HYDROGEN-RICH SEPARATED GAS AND WITH NAPHTHA VAPORS ARE INHIBITED.