Catalyst – solid sorbent – or support therefor: product or process – Regenerating or rehabilitating catalyst or sorbent – Gas or vapor treating
Patent
1982-08-04
1984-11-13
Konopka, P. E.
Catalyst, solid sorbent, or support therefor: product or process
Regenerating or rehabilitating catalyst or sorbent
Gas or vapor treating
208140, 502 49, 502 52, 502517, B01J 2396, C10G 35095
Patent
active
044826370
ABSTRACT:
A method is disclosed for regenerating reforming catalysts containing a platinum group component and/or rhenium component in association with a halogen component on a porous inorganic oxide, such as one containing alumina without significant displacement of the rhenium components by sulfur oxides generated during the regeneration process. The method is particularly characterized in that carbon is removed from the catalyst by in situ oxidation at temperatures not in excess of about 750.degree. F. and without modification of the catalytic reforming process flow circuit, as by disconnecting or isolating the heat exchangers and furnace tubes.
Sulfide scale is converted in a separate oxidation step to sulfur dioxide, SO.sub.2, without substantial oxidation to sulfur trioxide, SO.sub.3, by maintaining the inner walls of the heat exchangers and furnace tubes, where such iron sulfides are present, at a temperature not in excess of about 900.degree. F. and not less than about 750.degree. F. and under regenerating conditions including a low oxygen, O.sub.2, concentration. The sulfur dioxide then passes through the reforming catalyst without effectively displacing rhenium components from the carrier base. Further, by removal of these sulfides, complete regeneration of the catalyst is facilitated for subsequent redistribution of the platinum component at temperatures in excess of 900.degree. F., particularly when accompanied by halide addition.
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Buss Waldeen C.
Hughes Thomas R.
Chevron Research Company
Konopka P. E.
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