Alkali metal recovery from carbonaceous material conversion process
US4193771A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 1978 |
| Grant date | Mar 18, 1980 |
| Priority date | — |
| Expiry date | May 8, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10J2300/1892
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
In a coal gasification operation or similar conversion process carried out in the presence of an alkali metal-containing catalyst wherein solid particles containing alkali metal residues are produced in the gasifier or similar reaction zone, alkali metal constitutents are recovered from the particles by withdrawing and passing the particles from the reaction zone to an alkali metal recovery zone in the substantial absence of molecular oxygen and treating the particles in the recovery zone with water or an aqueous solution in the substantial absence of molecular oxygen. The solution formed by treating the particles in the recovery zone will contain water-soluble alkali metal constituents and is recycled to the conversion process where the alkali metal constituents serve as at least a portion of the alkali metal constituents which comprise the alkali metal-containing catalyst. Preventing contact of the particles with oxygen as they are withdrawn from the reaction zone and during treatment in the recovery zone avoids the formation of undesirable alkali metal constituents in the aqueous solution produced in the recovery zone and insures maximum recovery of water-soluble alkali metal co…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.