Electrodialytic water splitting process for removal of...

C - Chemistry – Metallurgy – 25 – B

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204/98

C25B 1/10 (2006.01) B01D 13/02 (1985.01)

Patent

CA 1230578

ABSTRACT ELECTRODIALYTIC WATER SPLITTING PROCESS FOR REMOVAL OF SO2 FROM GASES CONTAINING SAME AND FOR RECOVERY OF SO2 AND NaOH An electrodialytic water splitting process for con- verting the spent materials used for alkaline sodium scrubbing of SO2-containing gases into NaOH while recov- ering SO2 gas is disclosed. The alkaline sodium scrub- bing materials such as Na2CO3, NaHCO3, mixtures thereof such as impure trona ore may be used in the form of an aqueous slurry or aqueous solution to scrub SO2 from gases containing same to form a reaction mixture com- prising Na2SO3, Na2SO4, and optionally NaHSO3, and a gas depleted in SO2. The reaction mixture is contacted with an aqueous hydrogen ion solution comprising Na2SO4 and H2SO4 formed in an acid compartment of a two- or three- compartment electrodialytic water splitter to form a solution comprising aqueous SO2 values and aqueous Na2SO4. The contacting of the reaction mixture with the aqueous hydrogen ion solution may be performed exter- nally, in a reaction zone external to the water splitter or internally, in an acid compartment of the water split- ter. A liquid comprising water is fed to a base com- partment of the electrodialytic water splitter to form a liquid comprising aqueous NaOH. At least a portion of the aqueous sodium values in the aqueous Na2SO4 is transfered to the liquid comprising aqueous NaOH in the base compartment and an aqueous solution comprising NaOH is recovered from the base compartment. Gaseous SO2 is recovered from the aqueous SO2 values.

451850

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