Method of removing contaminants from used oil
US6398948B1 · kind B1 · utility
6Cited by
1References
3Claims
0Family size
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Key dates
| Filing date | Sep 18, 2000 |
| Grant date | Jun 4, 2002 |
| Priority date | — |
| Expiry date | Nov 2, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10M175/0033
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.