Mineral oils: processes and products – Refining – Purifying used oil
Reexamination Certificate
2005-08-16
2005-08-16
Griffin, Walter D. (Department: 1764)
Mineral oils: processes and products
Refining
Purifying used oil
C208S181000, C208S183000, C208S283000, C208S291000
Reexamination Certificate
active
06929737
ABSTRACT:
In a method of removing acidic compounds, color, and polynuclear aromatic hydrocarbons, and for removing or converting hydrocarbons containing heteroatoms from petroleum distillates, phase transfer catalyst is employed to facilitate the transfer of inorganic or organic bases to the substrate of the distillate. An inorganic or organic base, a phase transfer catalyst selected from the group including quaternary ammonium salts, polyol ethers and crown ethers, and used oil distillate are mixed and heated. Thereafter, contaminants are removed from the used oil distillate through distillation. A solvent is then mixed with the resulting distillate to extract contaminants therefrom. The solvent is recovered and distilled to separate the contaminants therefrom, and is then reused. The petroleum distillate having the contaminants separated therefrom is also distilled to remove any remaining solvent therefrom, with the recovered solvent being reused.
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Conn Garrett M.
Gorman William A.
Hershberger James W.
Hofacker Amanda L.
Sherman Jeffrey H.
Griffin Walter D.
Miami University
Moser, Patterson & Sheridan L.L.P.
Nguyen Tam M.
LandOfFree
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