Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Patent
1973-11-08
1976-01-27
Vertiz, Oscar R.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
423166, C01B 1700
Patent
active
039352960
ABSTRACT:
A method for effectively removing sulfur dioxide in the form of calcium sulfite from a combustion exhaust gas, comprising the steps of (1) feeding a portion of the combustion exhaust gas to a dilute sulfuric acid solution to produce sulfurous acid in the solution and oxidizing the resultant sulfurous acid with use of air or oxygen in the presence of an oxidizing catalyst to produce sulfuric acid; (2) feeding a residue of the combustion exhaust gas and the gas exhausted from the step (1) to an alkali sulfite aqeuous solution to produce an alkali bisulfite aqueous solution; (3) mixing a major portion of the alkali bisulfite aqueous solution produced in the step (2) with slaked lime or limestone for reaction to give a calcium sulfite-containing reaction solution; (4) separating calcium sulfite from the reaction solution obtained in the step (3); and (5) circulating the filtrate of the step (4) to the step (2) and mixing a minor portion of the alkali bisulfite aqueous solution produced in the step (2) with sulfuric acid produced in the step (1) and with a portion of calcium sulfite separated in the step (4), thereby to convert an alkali sulfate, which is secondarily produced in the alkali bisfulfite aqueous solution, into gypsum.
REFERENCES:
patent: 1271899 (1918-07-01), Howard et al.
patent: 2021936 (1935-11-01), Johnstone
patent: 2926999 (1960-03-01), Tarbutton et al.
patent: 3556722 (1971-01-01), Owaki
patent: 3775532 (1973-11-01), Shak
Funahashi Isao
Morita Tomijiro
Heller Gregory A.
Kureha Kagaku Kogyo Kabushiki Kaisha
Vertiz Oscar R.
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