Process for upgrading coal
US5059307A · kind A · utility
9Cited by
69References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1989 |
| Grant date | Oct 22, 1991 |
| Priority date | — |
| Expiry date | Oct 11, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/12
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
In a process for reducing the sulfur and ash contents of coal, coal is sequentially contacted with fused alkali metal caustic, water, carbonic acid, and a strong acid. Caustic removed from the coal by the water and the carbonic acid is recovered as anhydrous caustic for again contacting coal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.