Low ash coal products from depolymerized coal
US5296133A · kind A · utility
5Cited by
32References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 4, 1992 |
| Grant date | Mar 22, 1994 |
| Priority date | — |
| Expiry date | Aug 4, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10L9/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for preparing a low ash coal wherein coal is depolymerized at low temperature by contacting finely divided coal with a hard acid and soft base, and extracting the depolymerized coal to remove mineral contaminants.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.