Recovery of alkali metal constituents from catalytic coal conversion residues
In a coal gasification operation (32) or similar conversion process carried out in the presence of an alkali metal-containing catalyst wherein particles containing alkali metal residues are produced, alkali metal constituents are recovered from the particles by contacting them with water or an aqueous solution to remove water-soluble alkali metal constituents and produce an aqueous solution enriched in said constituents. The aqueous solution thus produced is then contacted with carbon dioxide to precipitate silicon constituents, the pH of the resultant solution is increased, preferably to a value in the range between about 12.5 and about 15.0, and the solution of increased pH is evaporated to increase the alkali metal concentration. The concentrated aqueous solution is then 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.
- DOE Contract Number:
- AC01-78ET13005
- Assignee:
- EDB-84-025913
- Patent Number(s):
- None
- Application Number:
- ON: DE84005976
- OSTI ID:
- 5331337
- Country of Publication:
- United States
- Language:
- English
Similar Records
Recovery of alkali metal constituents from catalytic coal conversion residues
Method of recovery of alkali-metal constituents from coal-conversion residues. [Patent application]
Related Subjects
010404* -- Coal
Lignite
& Peat-- Gasification
010500 -- Coal
Lignite
& Peat-- Products & By-Products
010800 -- Coal
Lignite
& Peat-- Waste Management
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305 -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
ALKALI METALS
AQUEOUS SOLUTIONS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
COAL GASIFICATION
DIAGRAMS
DISPERSIONS
ELEMENTS
FLOWSHEETS
GASIFICATION
MANAGEMENT
MATERIALS RECOVERY
METALS
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PROCESSING
RECOVERY
RECYCLING
RESIDUES
SOLUTIONS
THERMOCHEMICAL PROCESSES
WASTE MANAGEMENT
WASTE PROCESSING