Liquefaction of sub-bituminous and lignitic coal
US4028221A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 1975 |
| Grant date | Jun 7, 1977 |
| Priority date | — |
| Expiry date | Jun 6, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G1/065
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
In the liquefaction of a sub-bituminous and/or lignitic coal, prior to the liquefaction, the coal is soaked at a temperature of from 550.degree. to 750.degree. F and a pressure of from 30 to 300 psig for a time sufficient to remove at least 10% of the organic oxygen present in the coal to thereby reduce the hydrogen requirements of the liquefaction. The liquefaction is effected with a pasting solvent derived from the sub-bituminous and/or lignitic coal having a 5 volume percent distillation temperature of at least 550.degree. F and containing at least 25 weight percent of material boiling above 800.degree. F. The use of such a pasting solvent provides for improved dispersion of the coal particles during the liquefaction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.