Regeneration of a coke-deactivated catalyst comprising a combination of platinum germanium and halogen with a porous carrier material

Abstract

Abstract A DEACTIVATED HYDROCARBVON CONVERSION CATALYST, WHICH IS A COMBINATION OF A PLATINUM GROUP COMPONENT, A GERMANIUM COMPONENT AND A HALOGEN COMPONENT WITH A POROUS CARRIER MATERIAL AND WHICH HAS BEEN DEACTIVATED BY A DEPOSITION OF CARBONACEOUS MATERIAL THEREON DURING A PREVIOUS CONTACTING WITH A HYDROCARBON CHARGE STOCK AT HYDROCARBON CONVERSION CONDITIONS, IS REGNERATED BY THE SEQUENTIAL STEPS OF: (1) BURNING CARBON FROM THE DEACTIVATED CATALYST AT A RELATIVELY LOW TEMPERATURE WITH A SUBSTANTIALLY SULFUR-FREE FIRST GASEOUS MIXTURE CONTAINING RELATIVELY SMALL AMOUNTS OF OXYGEN, H2O AND HC1; (2) TREATING THE RESULTING CATALYST AT A RELATIVELY HIGH TEMPERATURE WITH A SECOND GASEOUS MIXTURE CONTAINING O2, H2O AND HC1; (3) PURGING OXYGEN FROM CONTACT WITH THE RESULTING CATLYST; AND (4) REDUCING THE RESULTING CATALYST BY CONTACTING WITH A SUBSTANTIALLY SULFUR-FREE THIRD GASEOUS MIXTURE CONTAINING HYDROGEN AND SAMLL AMOUNTS OF H2O AND HC1. KEY FEATURES OF THE REGENERATION METHOD INVOLVE THE PRESENCE OF BOTH H2O AND HC1 IN THE GAGEOUS MIXTURES USED IN THE CARBON-BURNING, OXYGEN-TREATING AND REDUCTION STEPS, THE USE OF SULFUR-FREE GASEOUS MIXTURES IN ALL OF THESE STEPS, AND THE CAREFUL CONTROL OF THE MOLE RATIO OF H2O TO HC1 EMPLOYED IN EACH OF THESE GASEOUS MIXTURES.

Inventors

• 👤 John C Hayes

Bibliographic Details