High pressure regeneration of a coke-deactivated catalyst containing platinum, rhenium, halogen & sulfur

Claim 1

A method for regenerating a deactivated hydrocarbon conversion catalyst which is a combination of a platinum group component, a rhenium component, a halogen component and a sulfur component with an alumina carrier material, the catalyst having been deactivated by deposition of carbonaceous materials thereon during a previous contacting with a hydrocarbon charge stock at hydrocarbon conversion conditions, said method comprising the sequential steps of: 1. contacting the deactivated catalyst with a substantially sulfur-free first gaseous mixture consisting essentially of hydrogen, about 0.02 to about 3.6 mole % H 2 O and HCl -- the mole ratio of H 2 O to HCl contained therein being about 20:1 to about 100:1 -- at a temperature of about 350° to about 600°C. and at a pressure of about 1 to about 50 atmospheres for a period extending until the resulting effluent gas stream is substantially free of hydrogen sulfide; 2. purging hydrogen from contact with the catalyst resulting from step (1) with an insert gas stream; 3. subjecting the catalyst resulting from step (2) to contact with a substantially sulfur-free second gaseous mixture consisting essentially of an insert gas, O 2 , H 2 O, and HCl -- the amount of O 2 being about 0.2 to about 3 mole % thereof, the amount of H 2 O being about 0.03 to about 3.6 mole % thereof and the mole ratio of H 2 O to HCl contained therein being selected from the range of about 20:1 to about 100:1 -- at a temperature of about 375° to about 450°C. and at a pressure of about 7 to about 35 atmospheres for a period sufficient to substantially remove said carbonaceous materials; 4. treating the catalyst resulting from step (3) with said second gaseous mixture for a period of at least about 0.5 to about 10 hours at a temperature of about 450° to about 550°C. and at a pressure of about 7 to about 35 atmospheres;

Claim 2

A method for regenerating a deactivated hydrocarbon conversion catalyst which is a combination of a platinum group component, a rhenium component, a halogen component and a sulfur component with an alumina carrier material, the catalyst having been deactivated by deposition of carbonaceous materials thereon during a previous contacting with a hydrocarbon charge stock at hydrocarbon conversion conditions, said method comprising the sequential steps of: 1. contacting the deactivated catalyst with a substantially sulfur-free first gaseous mixture consisting essentially of hydrogen, about 0.02 to about 3.6 mole % H 2 O and HCl -- the mole ratio of H 2 O to HCl contained therein being about 20:1 to about 100:1 -- at a temperature of about 350° to about 600°C. and at a pressure of about 1 to about 50 atmospheres for a period extending until the resulting effluent gas stream is substantially free of hydrogen sulfide; 2. purging hydrogen from contact with the catalyst resulting from step (1) with an insert gas stream; 3. subjecting the catalyst resulting from step (2) to contact with a substantially sulfur-free second gaseous mixture consisting essentially of an insert gas, O 2 , H 2 O, and HCl -- the amount of O 2 being about 0.2 to about 3 mole % thereof, the amount of H 2 O being about 0.03 to about 3.6 mole % thereof and the mole ratio of H 2 O to HCl contained therein being selected from the range of about 20:1 to about 100:1 -- at a temperature of about 375° to about 450°C. and at a pressure of about 7 to about 35 atmospheres for a period sufficient to substantially remove said carbonaceous materials; 4. treating the catalyst resulting from step (3) with said second gaseous mixture for a period of at least about 0.5 to about 10 hours at a temperature of about 450° to about 550°C. and at a pressure of about 7 to about 35 atmospheres;