Process for producing regenerated humic acids from coal
US5248814A · kind A · utility
4Cited by
1References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1992 |
| Grant date | Sep 28, 1993 |
| Priority date | — |
| Expiry date | Sep 11, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC05F11/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Process for preparing regenerated humic acids from coal by means of the continuous oxidation on fluidized bed, characterized in that a coal of lignite, sub-bituminous or bituminous type is submitted to a preliminary oxidation under mild conditions in order to reduce the hydrogen content of said coal by an amount of 5 to 25% of hydrogen initially present in the starting coal, and that the resulting coal is subsequently submitted to an oxidation in order to produce the desired humic acids.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.