Used oil re-refining
US4512878A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 1983 |
| Grant date | Apr 23, 1985 |
| Priority date | — |
| Expiry date | Feb 16, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10M175/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Used oils, especially used lubricating oils which are normally considered waste and are discarded or burned, are reclaimed for reuse by a re-refining procedure involving the steps of: PA0 (a) heat soaking the used oil; PA0 (b) distilling the heat soaked oil; PA0 (c) passing the distillate through a guard bed of activated material; PA0 (d) hydrotreating the guard bed treated distillate under standard hydrotreating conditions. If the used oil to be re-refined contains a quantity of water and/or fuel fraction which the practioner considers sufficiently large to be detrimental, the used oil may be subjected to a dewatering/defueling step prior to being heat soaked.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.