Gasification process using ion-exchanged coal
US4200439A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 19, 1977 |
| Grant date | Apr 29, 1980 |
| Priority date | — |
| Expiry date | Dec 19, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10J2300/0996
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process wherein Group I-A or Group II-A metals, or both, can be ion-exchanged onto coal, especially a high rank coal, notably a subbituminous or bituminous coal, to produce a highly reactive carbonaceous feed for use in gasification reactions, especially to produce high-BTU fuel gases, but also intermediate-BTU or synthesis gas. The coal is treated by contact with an alkaline solution of an admixture of compounds, inclusive of a soluble alkali metal salt and an excess of an alkaline earth metal hydroxide, each of which interacts one with the other to form an alkali metal hydroxide, and an insoluble alkaline earth metal salt precipitate. The coal is treated in a single step by contact with the solution within which both the Group I-A and II-A metal compounds are dispersed, or dissolved. Where the coal does not contain adequate ion-exchange sites, these are formed by reaction between the alkali metal hydroxide, generated by the reaction, and the coal, and in turn all or a portion of the alkali metal cations are exchanged or replaced by alkaline earth metal cations which are present in the alkali metal hydroxide solution that is formed. Preferably, the treatment is continued until s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.