Hydroforming of a naphtha with a platinum-alumina-halogen catalyst and the regeneration of the catalyst with an oxygen- and halogen-containing gas

Claim 1

THE METHOD OF CATALYTICALLY HYDROFORMING NAPHTHAS IN A PROCESS IN WHICH THE HYDROFORMING OPERATION IS DISCONTINUED IN ORDER TO REGENERATE THE CATALYST, WHICH COMPRISES CONTACTING THE SAID NAPHTHA IN THE PRESENCE OF ADDED HYDROGEN WITH A CATALYST CONSISTING ESSENTIALLY OF FROM ABOUT 0.1-2% PLATINUM, 96.5-98.9% ALUMINA AND FROM ABOUT 1.0-1.5% HALOGEN CALCULATED AS HCI IN THE HYDROFORMING ZONE MAINTAINED UNDER A PRESSURE OF FROM ABOUT 200-450 P.S.I.G., MAINTAINING AN INLET TEMPERATURE OF THE REACTION ZONE IN THE RANGE OF FROM ABOUT 880*975*F., PERMITTING THE NAPHTHA TO REMAIN RESIDENT IN THE REACTION ZONE FOR A SUFFICIENT PERIOD OF TIME EFFECT THE DESIRED CONVERSION, DISCONTINUING THE NAPHTHA AND HYDROGEN FEED TO THE REACTION ZONE, PURGING THE REACTION ZONE WITH AN INERT GAS TO REMOVE VOLATIL EHYDROCARBONS, TREATING THE PURGED CATALYST WITH AN OXYGEN-CONTAINING GAS, WHICH GAS ALSO CONTAINS WATER AND A HALOGEN, THE RATIO OF HALOGEN, CALCULATED AS HCI TO WATER BEING FROM ABOUT 0.3-0.7, CONTINUING THE TREATMENT WITH THE REGENERATION GAS UNTIL CARBONACEOUS AND OTHER DEPOSITS HAVE BEEN SUBSTANTIALLY COMBUSTED AND REMOVED FROM THE CATALYST, THEREAFTER TREATING THE CATALYST WITH A PURGING GAS SUBSTANTIALLY FREE OF THE OXIDES OF CARBON TO REMOVE OXYGEN FROM THE SAID CATALYST AND THEREAFTER CONTACTING THE REGENERATED CATALYST WITH FEED NAPHTHA AND ADDED HYDROGEN IN A RENEWAL OF THE HYDROFORMING ON-STREAM PERIOD.