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
- DOE Contract Number:
- ET-78-C-01-2777
- 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
Similar Records
Recovery of alkali metal constituents from catalytic coal conversion residues
Process for carbonaceous material conversion and recovery of alkali metal catalyst constituents held by ion exchange sites in conversion residue
Related Subjects
alkali
metal
constituents
catalytic
coal
conversion
residues
gasification
operation
32
similar
process
carried
presence
metal-containing
catalyst
particles
containing
produced
recovered
contacting
46
53
61
69
water
aqueous
solution
remove
water-soluble
produce
enriched
contacted
carbon
dioxide
63
precipitate
silicon
ph
resultant
increased
81
preferably
value
range
12
15
evaporated
84
increase
concentration
concentrated
recycled
86
18
17
serve
portion
comprise
catalytic coal
concentrated aqueous
gasification operation
coal conversion
process carried
containing alkali
similar conversion
water-soluble alkali
conversion process
particles containing
alkali metal-containing
metal constituents
carbon dioxide
alkali metal
aqueous solution
coal gasification
coal gas
remove water
metal residues
metal-containing catalyst
soluble alkali
resultant solution
metal constituent
constituents serve
metal concentration
move water
particles contain
/48/208/502/