Mineral oils: processes and products – Refining – Metal contaminant removal
Reexamination Certificate
2004-07-07
2008-08-26
Nguyen, Tam M. (Department: 1797)
Mineral oils: processes and products
Refining
Metal contaminant removal
C208S252000, C208S253000
Reexamination Certificate
active
07416656
ABSTRACT:
A process for removing aluminum contaminants from the product of a Fischer-Tropsch synthesis reaction wherein said contaminants comprise at least 1 ppm of aluminum expressed as elemental metal in aluminum-containing contaminants having an effective diameter of less than 1 micron, said process comprising the steps of (a) collecting the contaminated Fischer-Tropsch product from the Fischer-Tropsch reactor; (b) forming a mixture comprising the contaminated Fischer-Tropsch product, at least an equal molar amount of a dicarboxylic acid containing from 2 to about 8 carbon atoms based upon the amount of aluminum present, and sufficient water for the dicarboxylic acid to form hydrogen ions; (c) maintaining the mixture under pre-selected conditions for a time sufficient for the aluminum contaminant and the dicarboxylic acid to form an aluminum containing precipitate having an effective diameter of greater than about 1 micron; (d) passing the mixture of step (c) through a particulate removal zone capable of removing substantially all of the aluminum-containing precipitate; and (e) recovering from the particulate removal zone a Fischer-Tropsch product containing less than about 1 ppm total aluminum.
REFERENCES:
patent: 4853109 (1989-08-01), Reynolds
patent: 6359018 (2002-03-01), O'Rear et al.
Bull Lucy Melinda
Kuehne Donald
Kuperman Alexander
O'Rear Dennis J.
Ambrosius James W.
Chevron U.S.A. Inc.
Nguyen Tam M.
Zavell A. Stephen
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