Hydroliquefaction of sub-bituminous and lignitic coals to heavy pitch
US4148709A · kind A · utility
8Cited by
8References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 27, 1977 |
| Grant date | Apr 10, 1979 |
| Priority date | — |
| Expiry date | Oct 27, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G1/06
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
In the hydroliquefaction of a sub-bituminous and/or lignitic coal, the inlet temperature to the hydroliquefaction zone is maintained at a temperature higher than those previously employed by providing recycle of hot liquid from the outlet portion of the hydroliquefaction zone. In this manner, the hydroliquefaction is operated at higher average temperatures, and total reaction volume is reduced, thereby reducing overall costs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.