Regeneration of a coke-deactivated bimetallic catalyst

Abstract

Abstract A DEACTIVATED HYDROCARBON CONVERSION CATALYST, WHICH IS A COMBINATION OF A PLATINUM GROUP COMPONENT, A GROUP IV-A METALLIC COMPONENT, AND A HALOGEN COMPONENT WITH A POROUS CARRIER MATERIAL AND WHICH HAS BEEN DEACTIVATED BY DEPOSITION OF CARBONACEOUS MATERIALS THEREON DURING A PREVIOUSLY CONTACTING WITH A HYDROCARBON CHARGE STOCK AT AN ELEVATED TEMPERATURE, IS REGENERATED BY THE SEQUENTIAL STEPS OF: (1) BURNING CARBON THEREFROM AT A RELATIVELY LOW TEMPERATURE WITH A GAS STREAM CONTAINING HALOGEN OR A HALOGEN-CONTAINING COMPOUND, H2O, AND A RELATIVELY SMALL AMOUNT OF O2, (2) TREATING THE RESULTING PARTIALLY REGENERATED CATALYST AT A RELATIVELY HIGHER TEMPERATURE WITH A GAS STREAM CONTAINING A HALOGEN OR A HALOGEN-CONTAINING COMPOUND, H2O, AND A RELATIVELY HIGHER AMOUNT OF O2, (3) PURGING O2 AND H2O FROM CONTACT WITH THE RESULTING CATALYST, AND (4) SUBJECTING THE RESULTING CATALYST TO CONTACT WITH A SUBSTANTIALLY SULFUR-FREE HYDROGEN STREAM AT REDUCTION CONDITIONS. KEY FEATURES OF THE DISCLOSED METHOD ARE: (1) PRESENCE OF WATER AND HALOGEN IN THE GAS STREAM USED IN THE CARBON-BURNING STEP AND IN THE OXYGEN-TREATING STEP, (2) CAREFUL CONTROL OF THE TEMPERATURE DURING EACH STEP, (3) MAINTENANCE OF THE HALOGEN CONTENT OF THE CATALYST AT A RELATIVELY HIGH LEVEL DURING THE ENTIRE REGENERATION PROCEDURE, AND (4) CAREFUL CONTROL OVER THE COMPOSITION OF THE GAS STREAMS USED IN THE VARIOUS STEPS THEREOF.

Inventors

• 👤 J Hayes

Bibliographic Details