초록 ▼

A method for regenerating a coke-contaminated cracking catalyst with the simultaneous carefully controlled combustion of CO to CO2 within a regeneration zone to produce regenerated catalyst and flue gas. Novel features of the method include adding to the regeneration zone, independently of the crack

A method for regenerating a coke-contaminated cracking catalyst with the simultaneous carefully controlled combustion of CO to CO2 within a regeneration zone to produce regenerated catalyst and flue gas. Novel features of the method include adding to the regeneration zone, independently of the cracking catalyst, a CO oxidation promoter and combusting CO to CO2 in the presence of the promoter and regenerated catalyst. The oxidation promoter may be added to the regeneration zone in amounts to control the CO concentration in the flue gas, a regeneration zone temperature, or the residual carbon concentration on regenerated catalyst.

대표청구항 ▼

A method for regenerating a coke-contaminated catalyst with simultaneous carefully-controlled combustion of CO to CO2 which comprises the steps of: (a) introducing coke-contaminated catalyst containing from about 0.5 to 1.5 wt. % coke into a regeneration zone; (b) adding to said regeneration zone, i

A method for regenerating a coke-contaminated catalyst with simultaneous carefully-controlled combustion of CO to CO2 which comprises the steps of: (a) introducing coke-contaminated catalyst containing from about 0.5 to 1.5 wt. % coke into a regeneration zone; (b) adding to said regeneration zone, independently of said coke-contaminated catalyst, a CO oxidation promoter selected from the group consisting of compounds of noble metals in an amount on an average daily basis equivalent to form about 0.1 to about 15 wt ppm of the circulating catalyst inventory on an elemental basis to promote the combustion of CO to CO2, dissolved in a liquid solvent selected from the group consisting of water and a hydrocarbon; (c) passing oxygen-containing regeneration gas into said regeneration zone in an amount selected to burn said coke from said coke-contaminated catalyst and to provide sufficient excess oxygent to accomplish the desired amount of CO combustion to CO2; (d) reacting a first portion of said oxygen-containing regeneration gas with said coke-contaminated catalyst in said regeneration zone at oxidation conditions selected to remove coke from said coke-contaminated catalyst and to produce a flue gas containing CO and wherein said oxidation conditions are sufficient to cause combustion of CO to CO2 in the presence of said oxidation promoter; 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 regenerated catalyst containing less than 0.3 wt. % coke at said oxidation conditions, thereby making a controlled quantity of exothermic heat of reaction available for operation of said regeneration zone and (ii) decreasing the amount of CO in the flue gas by its combustion to CO2.