Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1971-05-03
1976-01-27
Douglas, Winston A.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
208140, 252419, B01J 2396, C10G 3508
Patent
active
039352447
ABSTRACT:
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 a porous carrier material and which has been deactivated by deposition of carbonaceous material thereon during a previous contacting with a hydrocarbon charge stock at hydrocarbon conversion conditions, is regenerated by the sequential steps of: (1) stripping the sulfur therefrom by contacting with a first gaseous mixture comprising hydrogen, H.sub.2 O, and HCl; (2) purging hydrogen from contact with the catalyst with an inert gas stream; (3) burning carbon from the resulting catalyst at a relatively low temperature and a relatively high pressure with a substantially sulfur-free second gaseous mixture containing relatively small amounts of oxygen, H.sub.2 O, and HCl; (4) treating the resulting catalyst with the second gaseous mixture at a relatively high temperature and pressure; (5) purging oxygen from contact with the catalyst with an inert gas stream; and, (6) reducing the resulting catalyst by contacting with a substantially sulfurfree third gaseous mixture comprising hydrogen, H.sub.2 O, and HCl. Key feature of the regeneration method involves the use of both H.sub.2 O and HCl in the gaseous mixtures used in the four major steps thereof (i.e., steps (1), (3), (4), and (6)). Furthermore, in all of these steps the mole ratio of H.sub.2 O to HCl in the gas streams is maintained at a value selected from the range of about 20:1 to about 100:1.
REFERENCES:
patent: 3481861 (1969-12-01), Hayes
patent: 3496096 (1970-02-01), Kluksdahl
patent: 3617520 (1971-11-01), Kluksdahl
patent: 3622520 (1971-11-01), Hayes
Douglas Winston A.
Hoatson Jr. James R.
Konopka P. E.
McBride Thomas K.
Page II William H.
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