Decontamination of wet-processed phosphoric acid

Details Decontamination of wet-processed phosphoric acid Decontamination of wet-processed phosphoric acid

C - Chemistry, Metallurgy

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B

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C01B 25/22 (2006.01) C01B 25/234 (2006.01)

Patent

CA 1084238

DECONTAMINATION OF WET-PROCESSED PHOSPHORIC ACID. ABSTRACT OF THE DISCLOSURE: Wet-processed phosphoric acid is decontaminated. To this end, the phosphoric acid and an organic solvent, which is partially miscible with water and capable of absorbing phosphoric acid, are contacted countercurrently with respect to one another. The resulting organic phos- phoric acid solution is separated from contaminants un- absorbed by the solvent, termed primary raffinate, decon- taminated phosphoric acid is recovered either in the form of free acid by re-extracting the organic phosphoric acid solution with water, or in the form of an alkali metal phosphate by reacting the organic phosphoric acid solu- tion with an alkali, and the primary raffinate is treated countercurrently with a solvent containing a mineral acid. More specifically, the organic phosphoric acid extract, which originates from the primary raffinate treatment and contains more than 0 up to at most 10 weight% of water, is mixed with an anhydrous solvent in a ratio by weight necessary to ensure the formation of a mixture containing more than 0 and less than 50 % of water than would corres- pond to the saturation concentration of water in the sol- vent; and the mixture is contacted countercurrently with the phosphoric acid which is to be decontaminated.

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