Methods of removing contaminants from used oil

Details Methods of removing contaminants from used oil Methods of removing contaminants from used oil

2007-09-10

2010-02-16

Nguyen, Tam M (Department: 1797)

Mineral oils: processes and products

Refining

Purifying used oil

C208S180000, C208S181000, C208S108000

Reexamination Certificate

active

07662274

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.

REFERENCES:
patent: 4101414 (1978-07-01), Kim et al.
patent: 4351718 (1982-09-01), Brunelle
patent: 4381992 (1983-05-01), Wood et al.
Gorman, W.A. et al., A process to separate light ends, catalyst, base oils and asphalt extender from used lubricating oil . . . , PTQ, 2005, pp. 85-88, Q4.

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