Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Direct contact with molten material
Patent
1978-03-14
1979-11-06
Thomas, Earl C.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Direct contact with molten material
423242, B01D 5334
Patent
active
041736192
ABSTRACT:
Hot combustion gas from a coal or oil fired furnace is desulfurized by a regenerative molten alkali salt process. The process is both highly efficient and uncomplicated. Only three major pieces of equipment are required-- scrubber, regenerator, and auxiliary combustor. All reactions are adiabatic, no solids handling is required, only steam is required for salt regeneration, and the regeneration product is H.sub.2 S. Process temperature is low enough to minimize corrosion by the salt and to permit efficient fly ash removal prior to salt contact. High regeneration efficiency is achieved using only steam optionally mixed with CO.sub.2 as regenerant as follows: the combustion gas is maintained slightly reducing which causes the dominant sulfur species in the salt to be the sulfide; the salt cation composition is controlled to yield an acceptably high sulfide concentration in the salt; and salt regeneration is conducted at a significantly higher pressure than scrub.
REFERENCES:
patent: 3438722 (1969-04-01), Heredy et al.
patent: 3671185 (1972-06-01), Francois et al.
patent: 3919390 (1975-11-01), Moore
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