Abstract:
1. IN A REGENERATOR FOR A FLUIDIZED CATALYST WHEREIN THE PARTICULATED CATALYST MATERIAL IS CIRCULATED WITHIN A REGENERATION COMPARTMENT HAVING VERTICAL WALLS, IN A TURBULENT FLOW BY A CARRIER GAS TO FORM A FLUIDIZED BED, AND WHEREIN THE CONDITION OF SAID FLUIDIZED BED IS REGULATED TO MAINTAIN PREDETERMINED OPERATING CONDITIONS THEREIN, THE IMPROVEMENT FOR CONTINUOUSLY MONITORING THE PRESSURE WITHIN SAID FLUIDIZED BED COMPRISING, A CONDUIT EXTENDING INTO SAID REGENERATOR COMPARTMENT AND HAVING AN OPEN END DISPOSED IN SAID FLUIDIZED CATALYST BED, THE OTHER END OF SAID CONDUIT COMMUNICATED WITH A SOURCE OF A PURGE GAS, A PRESSURE SENSING ELEMENT CONNECTED TO SAID CONDUIT, AND IN COMMUNICATION WITH SAID REGENERATION COMPARTMENT, A SHEILD DISPOSED ABOUT SAID CONDUIT OPEN END DEFINING A CHAMBER IN COMMUNICATION WITH SAID FLUIDIZED BED WHEREBY TO RECEIVE THE FLUIDIZED CATALYST AS WELL AS PURGE GAS AT THE CONDUIT OPEN END, SAID SHEILD INCLUDING A CYLINDRICAL ELEMENT HAVING A PERFORATED WALL SPACED FROM SAID CONDUIT OPEN, END, THEREBY DEFINING AN ANNULUS ABOUT THE CONDUIT, AND A SUBSTANTIALLY FLAT PERFORATED FACE PLATE AT THE END OF SAID CYLINDRICAL SHEILD ELEMENT TO DEFINE A PARTIAL CLOSURE TO THE LATTER ADJACENT TO SAID CONDUIT OPEN END, SAID FACE PLATE BEING DISPOSED IN A PLANE SUBSTANTIALLY PARALLEL TO THE VERTICAL WALLS OF SAID REGENERATION COMPARTMENT.
Abstract:
A platinum group component catalyst, used in a hydroconversion unit comprising a plurality of reactors in series, is regenerated to remove carbonaceous matter from the catalyst without contaminating the catalyst with sulfur compounds by purging the hydroconversion unit of hydrocarbons, circulating an inert gas through the hydroconversion unit at a pressure of from 50 to 1000 p.s.i.g., controlling the inlet temperature in all but the terminal reactor to below about 500* F. while controlling the inlet temperature in the terminal reactor at from 500* to 700* F., then introducing an oxygen-containing gas into the terminal reactor to remove carbonaceous matter from the catalyst but insuring that the oxygen is discontinued when the exit stream from the terminal reactor contains more than about 0.1 volume percent oxygen.
Abstract:
A PROCESS FOR REGENERATING A BED OF COKE-CONTAINING CRYSTALLINE ZEOLITIC MOLECULAR SIEVES BY CONTINUOUSLY PASSING A CLOSED-LOOP FLOW OF HOT, OXYGEN-CONTAINING INERT GAS THROUGH THE MOLECULAR SEIVE BED, WHEREIN WATER IN THE CIRCULATING GAS STREAM IS MAINTAINED BELOW A PRESELECTED CONCENTRATION.
Abstract:
A NEW METHOD FOR REGENERATING A HYDROGENATION OF DEHYDROGENATION CATALYST OF A PLATINUM-GROUP METAL ON ALPHA-ALUMINA IS DISCLOSED. THE REACTOR CONTAINING THE CATALYST IS FIRST HEATED WITH AN OXIDIZING GAS TO BURN OFF DEPOSITED CARBONACEOUS MATERIAL. AFTER THE BURNING, THE CATALYST IS COOLED AND WASHED WITH LIQUID PHASE WATER FOR A TIME SUFFICIENT TO REMOVE IMPURITIES. THIS BURN AND WATER-WASH REGENERATION PROCEDURE CAN RESTORE THE CATALYST ACTIVITY AND SELECTIVITY TO SUBSTANTIALLY VIRGIN LEVELS.
Abstract:
A CIRCULATING OXIDIZING GAS STREAM USED TO REGENERATE A BED OF CRYSTALLINE ALUMINOSILICATES IS OXIDIZED EXTERNAL TO THE BED TO REMOVE OXIDIZABLES FROM THE EFFLUENT STREAM BEFORE IT IS RECYCLED BACK TO THE BED. AS AN ALTERNATE TO THE OXIDATION, THE OXIDIZABLES ARE REMOVED FROM THE EFFLUENT STREAM IN AN ADSORPTION STEP.
Abstract:
SPENT ZINC CHLORIDE CATALYST IS REGENERATED BY COMBUSTION IN THE VAPOR PHASE IN THE PRESENCE OF A FLUIDIZED REFRACTORY SOLID SUCH AS SILICA SAND. USE OF A NEAR-STOICHIOMETRIC AMOUNT OF AIR RESULTS IN SUBSTANTIALLY COMPLETE REMOVAL OF SULFUR, NITROGEN AND CARBON IMPURITIES, WHILE USE OF ABOUT 40 TO 60% OF THE STOICHIOMETRIC AMOUNT OF AIR RESULTS IN PRODUCTION OF A LOW-SULFUR FUEL GAS.
Abstract:
In a process for reducing the amount of oxygen in the effluent gases from a catalytic cracker regenerator, and thus controlling after-burning, a reducing gas such as carbon monoxide or hydrogen is injected into the regenerator above the bed of catalyst being regenerated. Preferably the amount of reducing gas is automatically controlled responsive to the oxygen content of the effluent flue gases from the regenerator. Preferably the reducing gas is introduced through at least three nozzles into the regenerator. Preferably the nozzles are located in substantially different positions within the regenerator above the bed of catalyst being regenerated, and the amount of reducing gas flow through each nozzle is controlled responsive to oxygen content of the effluent flue gases from the regenerator.
Abstract:
A fluidized bed reactor, vertically divided into two or more upper compartments or chambers which are connected to each other by a lower mixing chamber, provides a fluidized bed system wherein the fluidized catalyst can be used in one of the upper chambers and then by random movement pass into the lower mixing chamber hence into another upper chamber where it can be regenerated. This compact system requires a minimum of equipment and gives a maximum of operating efficiency.