Use of noble metal solutions in catalyst regeneration zones

Claim 1

A method for regenerating coke-contaminated fluidized catalytic cracking catalyst which has become spent as a result of its use in a hydrocarbon cracking reactor containing from about 0.5 to about 1.5 wt. % coke with simultaneous carefully-controlled oxidation of CO to CO 2 which comprises the steps of: (a) introducing said coke-contaminated cracking catalyst into a fluidized catalytic cracking catalyst regeneration zone; (b) passing into said regeneration zone, independently of said coke-contaminated cracking catalyst and free of the reactor feed stock, a CO oxidation promoter solution, to promote oxidation of CO to CO 2 , in an amount equivalent to from about 0.1 to about 30 ppm of the circulating catalyst inventory on an elemental metal basis, said solution comprising a noble metal compound dissolved in a solvent selected from the group consisting of saturated aliphatic alcohols having from 2 to 8 carbon atoms per molecule and possessing a freezing point of 32° F. or less; (c) passing into said regeneration zone an oxygen-containing regeneration gas in an amount selected to burn coke from said coke-contaminated cracking catalyst and to provide sufficient excess oxygen to effect the desired amount of CO oxidation; (d) reacting a first portion of said oxygen-containing regeneration gas with said coke-contaminated cracking catalyst in said regeneration zone at oxidation conditions including a temperature within the range of from about 1100° F. to about 1450° F. and a pressure within the range of from about atmospheric to about 50 psig selected to remove coke from said coke-contaminated catalyst and to produce a flue gas containing CO and sufficient to cause combination of CO and CO 2 in the presence of said oxidation promoter, thereby producing regenerated catalyst and flue gas; and, (e) simultaneously contacting said flue gas and a second portion of said oxygen-containing regeneration gas with said CO oxidation promoter in said regeneration zone in the presence of said regenerated catalyst at a temperature within the range of from about 1100° F. to 1450° F. and a pressure within the range of from about atmospheric to about 50 psig to effect a controlled quantity of exothermic heat of reaction and to decrease the amount of CO in said flue gas.

Claim 2

A method for regenerating coke-contaminated fluidized catalytic cracking catalyst which has become spent as a result of its use in a hydrocarbon cracking reactor containing from about 0.5 to about 1.5 wt. % coke with simultaneous carefully-controlled oxidation of CO to CO 2 which comprises the steps of: (a) introducing said coke-contaminated cracking catalyst into a fluidized catalytic cracking catalyst regeneration zone; (b) passing into said regeneration zone, independently of said coke-contaminated cracking catalyst and free of the reactor feed stock, a CO oxidation promoter solution, to promote oxidation of CO to CO 2 , in an amount equivalent to from about 0.1 to about 30 ppm of the circulating catalyst inventory on an elemental metal basis, said solution comprising a noble metal compound dissolved in a solvent selected from the group consisting of saturated aliphatic alcohols having from 2 to 8 carbon atoms per molecule and possessing a freezing point of 32° F. or less; (c) passing into said regeneration zone an oxygen-containing regeneration gas in an amount selected to burn coke from said coke-contaminated cracking catalyst and to provide sufficient excess oxygen to effect the desired amount of CO oxidation; (d) reacting a first portion of said oxygen-containing regeneration gas with said coke-contaminated cracking catalyst in said regeneration zone at oxidation conditions including a temperature within the range of from about 1100° F. to about 1450° F. and a pressure within the range of from about atmospheric to about 50 psig selected to remove coke from said coke-contaminated catalyst and to produce a flue gas containing CO and sufficient to cause combination of CO and CO 2 in the presence of said oxidation promoter, thereby producing regenerated catalyst and flue gas; and, (e) simultaneously contacting said flue gas and a second portion of said oxygen-containing regeneration gas with said CO oxidation promoter in said regeneration zone in the presence of said regenerated catalyst at a temperature within the range of from about 1100° F. to 1450° F. and a pressure within the range of from about atmospheric to about 50 psig to effect a controlled quantity of exothermic heat of reaction and to decrease the amount of CO in said flue gas.

Claim 11

A method for regenerating coke-contaminated fluidized catalytic cracking catalyst, which catalyst has become spent as a result of its use in a hydrocarbon cracking reactor, containing from about 0.5 to about 1.5 wt. % coke, with simultaneous controlled oxidation of CO to CO 2 which comprises: (a) passing said contaminated cracking catalyst to a fluidized catalytic cracking catalyst regeneration zone; (b) passing into said regeneration zone, independently of said contaminated cracking catalyst and free of the reactor feed stock, a CO oxidation promoter solution, to promote oxidation of CO to CO 2 , in an amount equivalent to from about 0.1 to about 30 ppm of the circulating catalyst inventory on an elemental metal basis, said solution comprising chloroplatinic acid dissolved in a solvent selected from the group consisting of 1-butanol and 2-ethyl-1-hexanol; (c) passing to said regeneration zone an oxygen-containing regeneration gas in an amount selected to burn coke from said coke-contaminated cracking catalyst and to provide sufficient excess oxygen to effect the desired amount of CO oxidation; (d) reacting a first portion of said oxygen-containing regeneration gas with said coke-contaminated cracking catalyst in said regeneration zone at oxidation conditions including a temperature within the range of from about 1100° F. to about 1450° F. and a pressure within the range of from about atmospheric to about 50 psig selected to remove coke from said coke-contaminated catalyst, to oxidize said coke to produce a flue gas containing CO and to cause combustion of CO to CO 2 in the presence of said oxidation promoter thereby producing regenerated catalyst and flue gas; and (e) simultaneously contacting said flue gas and a second portion of said oxygen-containing regeneration gas with said oxidation promoter in said regeneration zone in the presence of said regenerated catalyst at a temperature within the range of from about 1100° F. to about 1450° F. and a pressure within the range of from about atmospheric to about 50 psig to effect a controlled quantity of exothermic heat of reaction and to decrease the amount of CO in said flue gas.

Claim 12

A method for regenerating coke-contaminated fluidized catalytic cracking catalyst, which catalyst has become spent as a result of its use in a hydrocarbon cracking reactor, containing from about 0.5 to about 1.5 wt. % coke, with simultaneous controlled oxidation of CO to CO 2 which comprises: (a) passing said contaminated cracking catalyst to a fluidized catalytic cracking catalyst regeneration zone; (b) passing into said regeneration zone, independently of said contaminated cracking catalyst and free of the reactor feed stock, a CO oxidation promoter solution, to promote oxidation of CO to CO 2 , in an amount equivalent to from about 0.1 to about 30 ppm of the circulating catalyst inventory on an elemental metal basis, said solution comprising chloroplatinic acid dissolved in a solvent selected from the group consisting of 1-butanol and 2-ethyl-1-hexanol; (c) passing to said regeneration zone an oxygen-containing regeneration gas in an amount selected to burn coke from said coke-contaminated cracking catalyst and to provide sufficient excess oxygen to effect the desired amount of CO oxidation; (d) reacting a first portion of said oxygen-containing regeneration gas with said coke-contaminated cracking catalyst in said regeneration zone at oxidation conditions including a temperature within the range of from about 1100° F. to about 1450° F. and a pressure within the range of from about atmospheric to about 50 psig selected to remove coke from said coke-contaminated catalyst, to oxidize said coke to produce a flue gas containing CO and to cause combustion of CO to CO 2 in the presence of said oxidation promoter thereby producing regenerated catalyst and flue gas; and (e) simultaneously contacting said flue gas and a second portion of said oxygen-containing regeneration gas with said oxidation promoter in said regeneration zone in the presence of said regenerated catalyst at a temperature within the range of from about 1100° F. to about 1450° F. and a pressure within the range of from about atmospheric to about 50 psig to effect a controlled quantity of exothermic heat of reaction and to decrease the amount of CO in said flue gas.