Method for regeneration of sodium sulfite from spent flue gas de

Details Method for regeneration of sodium sulfite from spent flue gas de Method for regeneration of sodium sulfite from spent flue gas de

1981-12-22

1983-06-14

Vertiz, O. R.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

423166, 423512A, C01B 1700

Patent

active

043882820

ABSTRACT:
A double alkali process employs limestone to regenerate spent sodium sulfite and then recirculates the unreacted limestone to attain a high internal stoichiometry and high limestone utilization. The regeneration of the sodium sulfite is carried out in a plurality of reactors and separation of the slurry from the reactors is carried out in at least one hydroclone. The at least one hydroclone has two primary functions: one to promote the reaction of Na.sub.2 SO.sub.3, which reduces the reactor volumes and reduces the temperature of conversion; and two to reduce the concentration of the limestone overflow, thus increasing the limestone utilization.

REFERENCES:
patent: 3989797 (1976-11-01), Brady et al.
patent: 3995006 (1976-11-01), Downs et al.
patent: 4267156 (1981-05-01), Dauerman et al.

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