Hydrothermal alkali metal recovery process
- Houston, TX
- Baytown, TX
- Morris Plains, NJ
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, alkali metal constituents are recovered from the particles by treating them with a calcium or magnesium-containing compound in the presence of water at a temperature between about 250.degree. F. and about 700.degree. F. and in the presence of an added base to establish a pH during the treatment step that is higher than would otherwise be possible without the addition of the base. During the treating process the relatively high pH facilitates the conversion of water-insoluble alkali metal compounds in the alkali metal residues into water-soluble alkali metal constituents. The resultant aqueous solution containing water-soluble alkali metal constituents is then separated from the residue solids, which consist of the treated particles and any insoluble materials formed during the treatment step, and recycled to the gasification process where the alkali metal constituents serve as at least a portion of the alkali metal constituents which comprise the alkali metal-containing catalyst. Preferably, the base that is added during the treatment step is an alkali metal hydroxide obtained by water washing the residue solids produced during the treatment step.
- DOE Contract Number:
- E(49-18)-2369
- Assignee:
- Exxon Research & Engineering Co. (Florham Park, NJ)
- Patent Number(s):
- US 4219338
- OSTI ID:
- 863640
- Country of Publication:
- United States
- Language:
- English
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Hydrothermal alkali metal catalyst recovery process
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Related Subjects
alkali
metal
recovery
process
coal
gasification
operation
similar
conversion
carried
presence
metal-containing
catalyst
solid
particles
containing
residues
produced
constituents
recovered
treating
calcium
magnesium-containing
compound
water
temperature
250
degree
700
added
base
establish
ph
treatment
step
otherwise
addition
relatively
facilitates
water-insoluble
compounds
water-soluble
resultant
aqueous
solution
separated
residue
solids
consist
treated
insoluble
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formed
recycled
serve
portion
comprise
preferably
hydroxide
obtained
washing
metal recovery
gasification operation
containing compound
process carried
containing alkali
similar conversion
water-soluble alkali
treatment step
conversion process
particles containing
alkali metal-containing
metal compound
metal compounds
metal constituents
solid particles
solution containing
alkali metal
aqueous solution
coal gasification
recovery process
gasification process
metal hydroxide
coal gas
containing water
metal residues
metal-containing catalyst
solid particle
materials formed
soluble alkali
metal constituent
constituents serve
insoluble material
treating process
hydrothermal alkali
particles contain
water wash
soluble material
soluble materials
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