Hydroforming with special heat interchange

Claim 1

IN THE METHOD OF CATALYTICALLY HYDROFORMING NAPHTHA IN A SYSTEM COMPRISING A REACTION ZONE AND A REGENERATION ZONE IN COMMUNICATION THEREWITH WHEREIN THE CATALYST IS IN THE FORM OF A FLUIDIZED BED IN EACH OF SAID ZONES, AND WHEREIN THE RECYCLE GAS IS HEATED BY MEANS OIF EXTRANEOUS HEAT, THE IMPROVEMENT RESULTING IN ADDING A SUBSTANTIAL QUANTITY OF THE HEAT REQUIRED IN THE REACTION ZONE WHICH COMPRISES SUBJECTING THE COLD NAPHTHA TO INDIRECT HEAT EXCHANGE WITH THE HOT HYDROFORMED PRODUCT, THEN PASSSING THE NAPHTHA INTO INDIRECT HEAT EXCHANGE RELATIONSHIP WITH THE CATALYST UNDERGOING REGENERATION BY PASSAGE THROUGH A COIL ARRANGED IN THE BED OF CATALYST IN THE REGENERATOR WHEREBY IT ACQUIRES ADDITIONAL HEAT AND CONTROLLING THE EXIT TEMPERATURE OF THE NAPHTHA FROM THE COIL IN THE REGENERATOR BY VALVE MEANS RESPONSIVE TO THE AMOUNT OF HOT PRODUCT WHICH FLOWS IN HEAT EXCHANGE WITH THE COLD NAPHTHA AND THEREAFTER PASSING THE THUS PREHEATED NAPHTHA TO THE REACTION ZONE, THE NAPHTHA HAVING THUS BEEN PREHEATED IN THE ABSENCE OF EXTRANEOUS HEAT.