Compositions – Absorptive – or bindive – and chemically yieldive
Patent
1980-07-21
1983-05-03
Gluck, Irwin
Compositions
Absorptive, or bindive, and chemically yieldive
423117, 423119, 423128, 423551, 423556, C01F 710, C01F 776, C01D 500
Patent
active
043820107
ABSTRACT:
Flue gas containing sulfur dioxide is purified (and the sulfur content thereof is recovered in elemental form) by scrubbing the gas with aqueous sodium aluminate-sodium hydroxide solution thereby forming an underflow suspension consisting essentially of sodium and aluminum sulfites and sulfates and fly ash; oxidizing the sulfites to sulfates; evaporating the free water present; reducing the resulting apparently dry mixture of sodium and aluminum sulfates by the action of reactive hydrogen and a carbonaceous reducing agent thereby forming a solid mixture of a sodium oxide and sodium aluminate and a gaseous mixture comprising sulfur dioxide, sulfur, and hydrogen sulfide; condensing said sulfur; and inter-reacting said sulfur dioxide and hydrogen sulfide to provide elemental sulfur. The solid mixture is dissolved in water to regenerate the scrubbing solution, which is then recycled. The solution is filtered at any convenient point to remove fly ash and any other solids present.
REFERENCES:
patent: 1538837 (1925-05-01), Moxham
patent: 2055283 (1936-09-01), Fiske et al.
patent: 2099360 (1937-10-01), Yonemura et al.
patent: 2152597 (1939-03-01), Lurie
patent: 2189179 (1940-02-01), Park
patent: 2869984 (1959-01-01), Spence
Gluck Irwin
Kahn Evans
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