C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/524.8
C07C 51/02 (2006.01) C07C 51/487 (2006.01) C07C 55/06 (2006.01) C07C 55/07 (2006.01)
Patent
CA 1314905
ABSTRACT OF THE DISCLOSURE A process for producing oxalic acid, sodium oxalate or mixtures thereof comprises treating crude sodium oxalate solids or slurry, such as produced by the Bayer process in treating bauxite. The crude sodium oxalate solids or slurry include at least aluminum metal ions as well as other metal ions common to the Bayer process. The removal process comprises: dissolving the crude sodium oxalate in an aqueous solution to form a solution of sodium oxalate; separating insolubles from the solution; passing the solution through an ion exchange column to convert sodium oxalate, the ion exchange column having a bed of cation exchange resin of the acidic type, the solution as it passes over the bed of resin exchanging sodium ions of the sodium oxalate with hydrogen ions of the resin to produce sodium hydrogen oxalate acid, oxalic acid or mixtures thereof depending upon the strength of acidity of the resin, the exchanged sodium ions and the Al metal ions remaining on the bed of resin: and recovering the sodium hydrogen oxalate, oxalic acid or mixtures thereof as the effluent solution from the ion exchange column.
599561
Alcan International Limited
Sim & Mcburney
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