Method for removing sulfur dioxide in the form of calcium sulfit

Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component

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423512A, C01B 1700

Patent

active

039897966

ABSTRACT:
There is disclosed a method wherein sulfur dioxide contained in combustion exhaust gas is absorbed in an aqueous alkali sulfite solution to produce a corresponding alkali bisulfite and the resultant aqueous alkali bisulfite solution is added with calcium carbonate to form calcium sulfite, the method comprising wet-powdering the calcium carbonate into a particle size within a range of 0.1 - 30 .mu. in a slurry form by the use of a part of a filtrate which is obtained by separating calcium sulfite from the reaction solution, and re-using the remainder of the filtrate as an aqueous alkali sulfite solution for absorbing sulfur dioxide, whereby substantially no waste water is discharged out of the reaction system and sulfur dioxide can be recovered in the form of highly pure calcium sulfite.

REFERENCES:
patent: 3775532 (1973-11-01), Shah
patent: 3794714 (1974-02-01), Atsukawa et al.
patent: 3848070 (1974-11-01), Omozuka et al.

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