Recovery of alkali metal constituents from catalytic coal conversion residues
- Houston, TX
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 (46, 53, 61, 69) 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 (63) to precipitate silicon constituents, the pH of the resultant solution is increased (81), preferably to a value in the range between about 12.5 and about 15.0, and the solution of increased pH is evaporated (84) to increase the alkali metal concentration. The concentrated aqueous solution is then recycled to the conversion process (86, 18, 17) where the alkali metal constituents serve as at least a portion of the alkali metal constituents which comprise the alkali metal-containing catalyst.
- Research Organization:
- Exxon Research and Engineering Co
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4459138
- OSTI ID:
- 865081
- Country of Publication:
- United States
- Language:
- English
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alkali
alkali metal
alkali metal-containing
aqueous
aqueous solution
carbon
carbon dioxide
carried
catalyst
catalytic
catalytic coal
coal
coal conversion
coal gas
coal gasification
comprise
concentrated
concentrated aqueous
concentration
constituents
constituents serve
contacted
contacting
containing
containing alkali
conversion
conversion process
dioxide
enriched
evaporated
gasification
gasification operation
increase
increased
metal
metal concentration
metal constituent
metal constituents
metal residues
metal-containing
metal-containing catalyst
move water
operation
particles
particles contain
particles containing
ph
portion
precipitate
preferably
presence
process
process carried
produce
produced
range
recovered
recovery
recycled
remove
remove water
residues
resultant
resultant solution
serve
silicon
similar
similar conversion
soluble alkali
solution
value
water
water-soluble
water-soluble alkali