Spent oil recovery process
US4406778A · kind A · utility
12Cited by
3References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 11, 1982 |
| Grant date | Sep 27, 1983 |
| Priority date | — |
| Expiry date | Jun 11, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D11/0407
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for reclaiming spent oil comprises the steps of removing water and light hydrocarbons, thermally treating the stripped oil, extracting it with a supercritical gas to insolubilize impurities and additives, separating the gas-rich fractions from the oil-depleted gas fractions, expanding the insoluble fractions, separating the additives and impurities, separating the various hydrocarbon fractions according to the respective viscosities, compressing and recycling the gas phases and withdrawing the residue and the oil fractions according to the respective viscosities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.