Method of removing hydrogen sulfide from gases utilizing a zinc oxide sorbent and regenerating the sorbent
- Concord, MA
- Maynard, MA
A spent solid sorbent resulting from the removal of hydrogen sulfide from a fuel gas flow is regenerated with a steam-air mixture. The mixture of steam and air may also include additional nitrogen or carbon dioxide. The gas mixture contacts the spent sorbent containing metal sulfide at a temperature above 500.degree. C. to regenerate the sulfide to metal oxide or carbonate. Various metal species including the period four transition metals and the lanthanides are suitable sorbents that may be regenerated by this method. In addition, the introduction of carbon dioxide gas permits carbonates such as those of strontium, barium and calcium to be regenerated. The steam permits regeneration of spent sorbent without formation of metal sulfate. Moreover, the regeneration will proceed with low oxygen concentrations and will occur without the increase in temperature to minimize the risk of sintering and densification of the sorbent.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- DOE Contract Number:
- W-31109-ENG-38
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4442078
- OSTI ID:
- 864948
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
removing
hydrogen
sulfide
gases
utilizing
zinc
oxide
sorbent
regenerating
spent
solid
resulting
removal
fuel
gas
flow
regenerated
steam-air
mixture
steam
air
additional
nitrogen
carbon
dioxide
contacts
containing
metal
temperature
500
degree
regenerate
carbonate
various
species
including
period
transition
metals
lanthanides
suitable
sorbents
addition
introduction
permits
carbonates
strontium
barium
calcium
regeneration
formation
sulfate
moreover
proceed
oxygen
concentrations
occur
increase
minimize
risk
sintering
densification
oxygen concentrations
oxide sorbent
dioxide gas
metal sulfate
oxygen concentration
metal species
metal sulfide
zinc oxide
transition metals
gas flow
fuel gas
carbon dioxide
metal oxide
transition metal
hydrogen sulfide
gas mixture
removing hydrogen
air mixture
containing metal
various metal
suitable sorbent
oxide gas
spent solid
sorbent containing
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