B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
204/98.06
B01D 61/42 (2006.01) B01D 61/44 (2006.01) C01B 21/42 (2006.01) C23G 1/36 (2006.01) C25B 1/22 (2006.01)
Patent
CA 1284309
ABSTRACT RECOVERY OF MIXED ACIDS FROM MIXED SALTS A process for recovering concentrated mixed acids comprising HF from mixed salts at a high efficiency is disclosed The process comprises the steps of providing an electrodialytic water splitter comprising at least one unit cell, each cell comprising a first compartment and a second compartment, feeding an aqueous solution comprising at least two salts formed from at least two different anions to the first compartment, one of said anions being fluoride, feeding a liquid comprising water to the second compartment, passing current through said electrodialytic water splitter to produce an aqueous product comprising mixed acids formed from the different anions in the second compartment, and an aqueous salt- containing product comprising a reduced concentration of said anions in the first compartment, and recovering aqueous products from the second compartment. The process is particularly useful in the production of con- centrated HNO3 at unexpectedly high current efficien- cies, and has particular utility in the area of regen- erating stainless steel pickling acid mixtures com- prising HF and HNO3.
504205
Chlanda Frederick Paul
Mani Krishnamurthy Nagasubramanian
Graver Water Systems Inc.
Osler Hoskin & Harcourt Llp
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