Two stage regeneration of platinum containing catalyst composite employed in hydroforming

Claim 1

A METHOD FOR OBTAINING HIGH YIELDS OF HIGH OCTANE NUMBER PRODUCT IN WHICH A FIXED BED OF PLATINUM ON PURIFIED ALUMINA CATALYST WHICH HAS LOST ACTIVITY AND HAS BECOME FOULED WITH CARBONACEOUS MATERIAL AND CARBON IN A HYDROFORMING OPERATION AT A TEMPERATURE IN THE RANGE BETWEEN 900* AND 1000*F. BY CONTACT WITH A VAPORIZED NAPHTHENIC HYDROCARBON BOILING IN THE RANGE BETWEEN 150* AND 500*F. AND HYDROGEN IS CONDITIONED TO PRODUCE SAID YIELDS AND PRODUCT WHICH COMPISES FLOWING FLUE GAS OVER SAID BED OF CATALYST AT A TEMPERATURE IN THE RANGE BETWEEN 600* AND 1000*F. TO PURGE SAID NAPHTHENIC HYDROCARBON AND HYDROGEN FROM SAID BED, ADJUSTING THE TEMPERATURE OF THE FLUE GAS TO A TEMPERATURE IN THE RANGE BETWEEN 700* AND 800*F. WHILE CONTINUING TO FLOW FLUE GAS OVER SAID BED UNTIL THE TEMPERATURE OF THE BED IS IN THE RANGE BETWEEN 700*F. AND 800*F., DILUTING THE FLUE GAS WITH A FREE OXYGEN-CONTAINING GAS IN AN AMOUNT SUFFICIENT TO PROVIDE AN OXYGEN PARTIAL PRESSURE OF LESS THAN ONE ATMOSPHERE AND TO SUPPORT A COMBUSTION OPERATION IN SAID BED HAVING A FLAME FRONT ADVANCING THROUGH SAID BED IN THE DIRECTION OF FLOW AT A TEMPERATURE BETWEEN THAT OF THE BED AFTER FLOW OF SAID FLUE GAS THEREOVER AND BEFORE THE COMBUSTION OPERATION AND A TEMPERATURE NOT IN EXCESS OF 1100*F. UNTIL SAID CARBONACEOUS MATERIAL AND CARBON ARE BURNED FROM THE BED, INCREASING THE FREE OXYGEN CONTENT OF THE FLUE GAS TO PROVIDE A PARTIAL PRESSURE OF AT LEAST ONE ATMOSPHERE UWHILE INCREASING THE TEMPERATURE OF THE FLUE GAS TO A TEMPERATURE IN THE RANGE BETWEN 1050* AND 1100*F., COOLING THE FREE OXYGENCONTAINING FLUE GAS HAVING AN INCREASED FREE OXYGEN CONTENT TO A TEMPERATURE IN THE RANGE BETWEEN 800* AND 900*F. AND CONTINUING THE FLOW OF SAID COOLED FREE OXYGEN-CONTAINING FLUE GAS OVER SAID BED UNTIL THE TEMPERATURE OF THE BED IS IN THE RANGE BETWEEN 800* AND 900*F., TERMINATING THE FLOW OF SAID COOLED FREE OXYGENCONTAINING FLUE GAS, FLOWING FLUE GAS OVER SAID COOLED BED AT A TEMPERATURE IN THE RANGE BETWEEN 800* AND 900*F. TO REMOVE FREE OXYGEN FROM SAID BED, FLOWING A FREE HYDROGEN-CONTAINING GAS OVER SAID BED AT A TEMPERATURE IN THE RANGE BETWEEN 800* AND 900*F., INCREASING THE TEMPERATURE OF THE BED TO A TEMPERATURE IN THE RANGE BETWEEN 900* AND 1000*F., AND THEN FLOWING SAID NAPHTHENIC HYDROCARBON OVER SAID BED IN ADMIXTURE WITH SAID FREE HYDROGEN-CONTAINING GAS TO FORM HIGH YIELDS OF HIGH OCTANE NUMBER PRODUCT FROM SAID NAPHTHENIC HYDROCARBON.