C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
204/170, 204/98.
C25B 13/00 (2006.01) B01D 61/44 (2006.01) C25B 1/10 (2006.01) C25B 1/16 (2006.01) C25B 1/22 (2006.01)
Patent
CA 1230850
ABSTRACT MULTICHAMBER TWO-COMPARTMENT ELECTRODIALYTIC WATER SPLITTER AND METHOD OF USING SAME FOR ACIDIFICATION OF AQUEOUS SOLUBLE SALTS A method for generating an acidified aqueous salt solution and an aqueous base in a multichamber two- compartment electrodialytic water splitter having a unit cell comprised of a bipolar membrane, a first cation permselective membrane and at least one additional (preferably one) substantially non-porous, water-swollen cation permselective or neutral membrane disposed between a cation face of the bipolar membrane and a face of said first cation membrane forming at least two acid compartments and a base compartment positioned between an anode and a cathode, which comprises the steps of: (a) introducing a liquid comprising water to a base compartment formed by an anion face of a bipolar membrane and a face of said first cation membrane ;(b) introducing a liquid comprising an aqueous soluble salt to at least one additional acid compartment formed by the faces of said first cation membrane and said at least one additional cation or neutral membrane; (c) serially transferring the liquid comprising the aqueous soluble salt from said additional acid compartment to the first acid compartment formed by a face of said at least one additional cation or neutral membrane and a cation face of a bipolar membrane; (d) passing direct current through said water splitter thereby adding hydrogen ions to the first acid compartment, trans- ferring hydrogen ions through said at least one cation or neutral membrane from the first acid compart- ment to the said additional acid compartment, metal cations from the acid compartment to the base compart- ment, and adding hydroxide ions to the liquid comprising water in the base compartment; (e) withdrawing a liquid comprising aqueous base from the base compartment; and (f) withdrawing an acidified aqueous soluble salt from the first acid compartment is disclosed.
452153
Chlanda Frederick P.
Mani Krishnamurthy N.
Allied Corporation
Osler Hoskin & Harcourt Llp
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