Catalyst – solid sorbent – or support therefor: product or process – Regenerating or rehabilitating catalyst or sorbent – Treating with a liquid or treating in a liquid phase,...
Reexamination Certificate
2005-01-19
2010-10-26
Silverman, Stanley (Department: 1793)
Catalyst, solid sorbent, or support therefor: product or process
Regenerating or rehabilitating catalyst or sorbent
Treating with a liquid or treating in a liquid phase,...
C502S028000, C502S038000
Reexamination Certificate
active
07820579
ABSTRACT:
A method of restoring catalytic activity to a spent hydroprocessing catalyst that has a first carbon concentration. The concentration of carbon on the spent hydroprocessing catalyst is reduced to provide a carbon-reduced catalyst having a second carbon concentration that is less than the first carbon concentration. The carbon-reduced catalyst is exposed to a solution, comprising a chelating agent and a solvent, for an aging time period sufficient to provide for a restored catalytic activity thereby resulting in an aged catalyst having incorporated therein the chelating agent and the solvent. The aged catalyst is exposed to conditions, including a drying temperature, so as to remove from the aged catalyst a portion of the solvent without removing a significant portion of the chelating agent from the aged catalyst thereby resulting in a dried aged catalyst. The dried aged catalyst is then sulfur treated to thereby provide a restored catalyst. The restored catalyst and those catalysts made by the treatment method can be used in a hydroprocessing process comprising contacting the restored catalyst with a hydrocarbon feedstock under hydroprocessing conditions.
REFERENCES:
patent: 5468372 (1995-11-01), Seamans et al.
patent: 6239054 (2001-05-01), Shukis et al.
patent: 6239066 (2001-05-01), Shukis et al.
patent: 6291394 (2001-09-01), Shukis et al.
patent: 6635596 (2003-10-01), Eijsbouts et al.
patent: 541994 (1993-05-01), None
patent: 1043069 (2000-10-01), None
patent: 95/31280 (1995-11-01), None
patent: 96/41848 (1996-12-01), None
patent: 01/02092 (2001-01-01), None
Written Opinion for PCT/US2005/001825 of May 12, 2005.
Ginestra Josiane Marie-Rose
Lee Kenneth Scott
Seamans James Dallas
Shell Oil Company
Silverman Stanley
Stewart Charles W.
Zimmer Anthony J
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