Processes for the production of deashed coal
US4119523A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 1976 |
| Grant date | Oct 10, 1978 |
| Priority date | — |
| Expiry date | Aug 23, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G1/04
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An improved coal deashing process wherein soluble dissolved coal present in the ash concentrate product stream from a critical solvent deashing process can be separated and recovered from the ash concentrate by at least two alternate processing systems. In one such system, the ash concentrate (containing dissolved and undissolved coal) is admixed with a suitable organic solubilizing solvent to obtain partial redissolution, at elevated temperature and at pressures of atmospheric and above, and thereafter subjecting said mixture to a separation treatment. The liquid product thus separated, containing substantially all of the dissolved coal and only a minor amount of mineral ash, thereafter is recycled to the initial coal dissolution step to thereby provide a portion of the initial solvent necessary for preparation of the coal feed. In the alternate process, the ash concentrate (containing dissolved and undissolved coal) is again partially redissolved by admixing with a suitable organic solubilizing solvent, at elevated temperature and at pressures of atmospheric and above, and thereafter subjecting said mixture to exact and precise separation treatment. Said separation treatment bein…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.