Process for the discharge of ash concentrate from a coal deashing system
US4162958A · kind A · utility
6Cited by
5References
5Claims
0Family size
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Inventor
Key dates
| Filing date | Mar 20, 1978 |
| Grant date | Jul 31, 1979 |
| Priority date | — |
| Expiry date | Mar 20, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G1/04
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An improved process for the continuous discharge from a first separation zone of a first heavy fraction comprising insoluble coal products and solvent in a coal deashing process utilizing solvents at elevated pressures and temperatures near the critical temperature of the solvent. The continuous discharge of the insoluble coal products in a dry, powdery form, is achieved by monitoring the temperature level of the solvent and insoluble coal products within a transfer conduit after withdrawal and pressure reduction from the first separation zone operating pressure, at a temperature below about 550 degrees F.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.