Utilization of low rank coal and peat
US4705533A · kind A · utility
23Cited by
26References
27Claims
0Family size
Inventor
Key dates
| Filing date | Apr 4, 1986 |
| Grant date | Nov 10, 1987 |
| Priority date | — |
| Expiry date | Apr 4, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10L1/324
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Low rank coals including lignite, brown and sub-bituminous coals, and peat containing unacceptably high quantities of water are dried and enriched in BTU content. The mine low rank coal is crushed to between about one-half inch and three inches in diameter and immersed in hot oil to dry the coal. The coal is then screened or centrifuged to remove excess oil and the resulted oil impregnated dried coal has a much higher BTU content. The dried high BTU low rank coal may be then powdered and utilized to form a coal-water liquid fuel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.