Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Patent
1976-04-20
1978-10-24
Vertiz, O. R.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
423428, 423422, 423514, C01B 1700, C01D 700, C01B 1508, C01B 1764
Patent
active
041221486
ABSTRACT:
Sodium thiosulfate is purged from a sulfur dioxide removal system involving contact of a sulfur dioxide-containing gas with a solution containing sodium sulfite to absorb sulfur dioxide from the gas. A portion of the liquid from a desorption zone containing a minor amount of sodium thiosulfate and a relatively large amount of sodium bisulfite, is treated to reduce the amount of water in the medium so that solids are precipitated from the liquid phase. The insolubles containing sodium sulfites are removed from the liquid. The liquid separated from the solids can be discarded and thereby purge thiosulfate more selectively with respect to other sodium salts. Also, the sodium values of the sodium thiosulfate-containing purge liquid can be recovered in active form by chemical reduction, and, preferably, carbonation. A sodium sulfate purge material from the absorption-desorption system can also be subjected to the chemical reduction system for further recovery of active sodium values.
REFERENCES:
patent: 3653812 (1972-04-01), Schneider et al.
patent: 3790660 (1974-02-01), Earl et al.
patent: 3808325 (1974-04-01), Urban
patent: 3838191 (1974-09-01), Urban
patent: 3971844 (1976-07-01), Schneider
Industrial & Engineering Chemistry, vol. 53, No. 8, p. 620, Saeman.
Nicholson Norman E.
Scarlett John
Davy Powergas Inc.
Heller Gregory A.
Vertiz O. R.
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