Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1985-09-10
1986-12-16
Niebling, John F.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204301, 423242, 423206T, 55 73, B01D 1302
Patent
active
046295453
ABSTRACT:
An electrodialytic water splitting process for recovering SO.sub.2 -containing gases for converting the spent materials used in alkaline sodium scrubbing of SO.sub.2 -containing gases into NaOH. The alkaline sodium scrubbing materials such as Na.sub.2 CO.sub.3, NaHCO.sub.3 or mixtures thereof are used in the form of an aqueous slurry or aqueous solution to scrub SO.sub.2 from gases containing same to form a reaction mixture comprising Na.sub.2 SO.sub.3, Na.sub.2 SO.sub.4, and possibly NaHSO.sub.3, and a gas depleted in SO.sub.2. The reaction mixture is contacted with an aqueous hydrogen ion solution comprising Na.sub.2 SO.sub.4 and H.sub.2 SO.sub.4 formed in an acid compartment of a two- or three-compartment electrodialytic water splitter to form a solution comprising aqueous SO.sub.2 values and aqueous Na.sub.2 SO.sub.4. Contact of the reaction mixture with the aqueous hydrogen ion solution may be performed externally, of the water splitter or internally, in an acid compartment of the water splitter. Gaseous SO.sub.2 can then be recovered from the aqueous SO.sub.2 values. A liquid comprising water and at least a portion of the aqueous sodium values in the aqueous Na.sub.2 SO.sub.4 is transfered to a base compartment of the electrodialytic water splitter to produce a liquid comprising aqueous NaOH. The aqueous solution comprising NaOH can then be recovered from the base compartment.
REFERENCES:
patent: 3515513 (1970-06-01), Parsi
patent: 3904733 (1975-09-01), Gancy et al.
patent: 4082835 (1978-04-01), Chlanda et al.
patent: 4385039 (1983-05-01), Lowell et al.
patent: 4552635 (1985-11-01), Jenczewski et al.
Patent Memorandum 01-78, entitled "Electro Chemical Sulfur Oxide Pollution Control Process for Sulfuric Acid Plants" by T. J. Jenczewski and W. H. Skinner.
Chlanda Frederick P.
Mani Krishnamurthy N.
Allied Corporation
Boggs Jr. B. J.
Fuchs Gerhard H,.
Hampilos Gus T.
Niebling John F.
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