Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing


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423321R, C01B 2516




The invention relates to the purification of wet phosphoric acid in which raw, wet acid extracted by means of a solvent, desulfated by means of a calcium ion aqueous solution and regenerated by means of water, is then treated with water vapor or hot gases by which a concentrated solution of phosphoric acid with a ponderal ratio F/P.sub.2 O.sub.5 less than 10 ppm is obtained.

patent: 4083937 (1978-04-01), Toshimitsu et al.
patent: 4118462 (1978-10-01), Desire et al.


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