Mineral oils: processes and products – Refining – Sulfur removal
Patent
1991-07-03
1993-07-27
Morris, Theodore
Mineral oils: processes and products
Refining
Sulfur removal
208305, 502 22, 502 29, 502 31, 502 33, C10G 4504, B01J 3850, B01J 3856, B01J 3852
Patent
active
052307913
ABSTRACT:
Spent or inactive alumina-supported catalysts removed from a catalytic hydrotreating process and having carbonaceous and metallic deposits thereon are reactivated. After a solvent wash to remove process oils, the spent catalyst is treated with an organic solvent, such as N-methyl-2-pyrrolidone, at a temperature of 200.degree. to about 500.degree. F. for a period of about 1 to about 12 hours to form the reactivated catalyst suitable for reuse in a catalytic hydrotreating process. Optionally, the solvent treated catalyst can be regenerated by contact with an oxygen-containing gas at a temperature of about 700.degree. to about 900.degree. F. to remove carbon deposits from the catalyst, or, alternatively, the solvent treated catalyst can be acid leached to remove undesired metals and then contacted with an oxygen-containing gas at an elevated temperature to remove carbon deposits.
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Griffin Walter D.
Hunter Walter D.
Morgan Richard A.
Morris Theodore
Park Jack H.
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