Process for heat treatment of coal
US4308668A · kind A · utility
1Cited by
3References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 30, 1980 |
| Grant date | Jan 5, 1982 |
| Priority date | — |
| Expiry date | May 30, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10F5/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
In a process for heat treatment, highly hygroscopic coal, with a low carbon content and large equilibrium moisture, is rapidly heated with hot gas at a rate of temperature rise of at least 100.degree. C./min up to a final heating temperature in the range of 300.degree.-500.degree. C., and is then rapidly cooled at a rate of temperature drop of at least 50.degree. C./min to 250.degree. C. or below. As the hot gas, an inert gas whose oxygen concentration is not higher than 4% by volume is employed. The hot gas is either caused to contain not less than 20% by volume of steam or composed solely of the steam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.