Recovery of acids from materials comprising acid and salt

Details Recovery of acids from materials comprising acid and salt Recovery of acids from materials comprising acid and salt

B - Operations, Transporting

01

D

204/98.06

B01D 61/42 (2006.01) B01D 61/44 (2006.01) C23G 1/36 (2006.01)

Patent

CA 1324981

RECOVERY OF ACIDS FROM MATERIALS COMPRISING ACID AND SALT ABSTRACT We have discovered an improved, energy efficient method for recovering and regenerating acid from a solution comprising acid and salt. The process comprises of the steps of supplying a solution comprising salt and a first concentration of acid to a first compartment of an electrodialysis apparatus comprising a first compartment and a second compartment, supplying a liquid comprising water to the second compartment, applying a direct current to the electrodialysis apparatus to form, in the first compartment, a first product comprising salt and a second concentration of acid, the second concentration of acid being less than the first concentration of acid, and, in the second compartment, a second product comprising water and enriched in acid by a proportionite amount, recovering the first product, recovering the second product, recovering acid from the first product using electrodialytic water splitting to convert at least a portion of the salt to a third product comprising acid, and recovering the third product. The process has particular utility for the recovery and regeneration of mixed acids from spent pickle liquors containing free nitric acid and salts of an anion other than nitrate anion.

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