Methods of removing contaminants from used oil
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United States of America Patent
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Feb 16, 2010
Grant Date -
Jan 3, 2008
app pub date -
Sep 10, 2007
filing date -
Feb 16, 1999
priority date (Note) -
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Abstract
In a method of removing acidic compounds, color, and polynuclear aromatic hydrocarbons, and for removing or converting hydrocarbons containing heteroatoms from used oil distillate, phase transfer catalysts are employed to facilitate the transfer of inorganic or organic bases to the substrate of the oil 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.
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