Coal extraction
US4521291A · kind A · utility
0Cited by
5References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 4, 1984 |
| Grant date | Jun 4, 1985 |
| Priority date | — |
| Expiry date | Apr 4, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G47/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Coal is extracted using a mixed solvent which includes a substantially aromatic component and a substantially naphthenic component, at a temperature of 400.degree. to 500.degree. C. Although neither component is an especially good solvent for coal by itself, the use of mixed solvent gives greater flexibility to the process and offers efficiency gains.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.