B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
362/45
B01D 11/04 (2006.01) C01B 21/46 (2006.01) C01B 21/48 (2006.01) C22B 3/28 (2006.01)
Patent
CA 1052019
ABSTRACT OF THE DISCLOSURE: A continuous process for removing nitrates from nitrate containing solutions having a pH of about 0-7, preferably about 1.3 - 6.0, by extracting the nitrate containing solution with an organic amine salt dissolved in an organic solvent; adjusting the pH of the organic extraction solvent phase emerging from the extraction at a value of about 0.5 at minimum, preferably 0.6 - 2.5; stripping the organic extraction solvent phase from the extraction with a saline solution to strip and reconvert the amine for the next extraction cycle into the same amine salt as used for the extraction; maintaining the concentration of the salt formed by the cation of the stripping salt and the nitrate anion in the stripping solution so high that this salt is crystallized from the stripping solution substantially con- tinuously, but still so low that the nitrate anion extracted into the organic extraction solvent phase passes during the stripping continuously into the stripping solution while the anion of the stripping salt passes from the stripping solution into the organic extraction solvent phase; and recovering crystallized nitrate salt from the stripping solution.
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