Process for degraded-mode regeneration of a catalyst
AssigneeInstitut Francais du Petrole
InventorsFrancois-Xavier Brunet, Olivier Clause, Frederic Hoffman, Jeremie Esquier
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Abstract
Process for regeneration of a catalytic moving bed in which the catalyst successively passes through at least one combustion zone A, at least one halogenation zone B, and at least one calcination zone C, whereby this process operates in a partial-regeneration-mode, the partially coked catalyst that is obtained from the last combustion zone passes into the halogenation zone in which the amount of halogen and the amount of oxygen are essentially zero--the valves of tubes (19) and (20) are then virtually closed--and the catalyst then passes through the calcination zone in which the amount of oxygen is essentially zero--the valve of tube (11) is then virtually closed.
Claims22
A process for regenerating a moving bed of catalyst in which under normal operation said catalyst successively passes through at least one combustion zone into which is introduced at least one entering oxygen-containing gas, at least one halogenation zone comprising a halogen containing gas and at least one calcination zone comprising an oxygen-containing gas, said process comprising intermittently conducting said combustion partially to obtain a partially coked catalyst having at least 0.1% coke, and passing said partially coked catalyst into the halogenation zone, wherein the amount of halogen of the halogenation zone is essentially zero, and the amount of oxygen in the halogenation zone is less than ten percent of the amount of oxygen of the most oxygen-rich combustion zone, and passing said catalyst through the calcination zone in which the amount of oxygen is less than ten percent of the amount of oxygen that is contained in the gas of the most oxygen-rich combustion zone.
A process for regenerating a moving bed of catalyst in which said catalyst successively passes through at least one combustion zone into which is introduced at least one entering oxygen-containing gas, at least one halogenation zone and at least one calcination zone comprising an oxygen-containing gas, said process comprising conducting said combustion partially to obtain a partially coked catalyst having at least 0.1% coke, said combustion being conducted in each combustion zone such that the oxygen content of the entering gas is between 0.01 and 2%, the temperature of the entering gas is between 350 and 600.degree. C., and the dwell time of the catalyst in a zone is between 5 minutes and 3 hours, and passing said partially coked catalyst into the halogenation zone, wherein the amount of halogen of the halogenation zone is essentially zero, and the amount of oxygen in the halogenation zone is less than ten percent of the amount of oxygen of the most oxygen-rich combustion zone, and passing said catalyst through the calcination zone in which the amount of oxygen is less than ten percent of the amount of oxygen that is contained in the gas of the most oxygen-rich combustion zone.
A process for regenerating a moving bed of catalyst in which said catalyst successively passes through at least one combustion zone into which is introduced at least one entering oxygen-containing gas, at least one halogenation zone and at least one calcination zone, said process comprising intermittently conducting said combustion partially to obtain a partially coked catalyst having at least 0.1% coke, and passing said partially coked catalyst into the halogenation zone, wherein the amount of halogen of the halogenation zone is essentially zero, and the amount of oxygen in the halogenation zone is less than ten percent of the amount of oxygen of the most oxygen-rich combustion zone, and passing said catalyst through the calcination zone in which the amount of oxygen is less than ten percent of the amount of oxygen that is contained in the gas of the most oxygen-rich combustion zone, said process further comprising passing said partially coked catalyst through a combustion control zone after said combustion zone, wherein oxygen consumption in said combustion control zone is less than ten percent of the oxygen that enters said combustion control zone;
- and further comprising measuring temperature and oxygen content variation between an inlet and an outlet of said control zone so as to monitor the operation of said combustion zone, the variation for temperature is maximally 3% and the variation for oxygen is less than 10% within said combustion control zone.
Dependencies are inferred from the claim text.