Oil recovery
US4521293A · kind A · utility
14Cited by
6References
11Claims
0Family size
Inventors
Key dates
| Filing date | Jun 7, 1984 |
| Grant date | Jun 4, 1985 |
| Priority date | — |
| Expiry date | Jun 7, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S208/952
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for upgrading carbonaceous materials having low carbon content comprising preheating the carbonaceous material to a temperature above about 200.degree. C. in the absence of a solvent, extracting the heated carbonaceous material under moderate temperature and pressure conditions, and hydrotreating the extract under supercritical solvent conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.