Process for the purification of an impure phosphoric acid

Details Process for the purification of an impure phosphoric acid Process for the purification of an impure phosphoric acid

1979-02-06

1980-09-30

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

C01B 2516

Patent

active

042255686

ABSTRACT:
An organic phase including both phosphoric acid and sulfuric acid is purified of sulfate ion content by countercurrently washing same with an aqueous liquid in an at least two-stage wash zone, the pH of which having been adjusted with an alkali metal or ammonium compound to a value greater than that as would exist if the washing were effected with the aqueous liquid alone, under the same conditions, and whereby there results a purified organic phase comprising both SO.sub.4 and P.sub.2 O.sub.5 in an amount by weight of SO.sub.4 to P.sub.2 O.sub.5 of less than 50 ppm.

REFERENCES:
patent: 3607029 (1971-09-01), Goret et al.
patent: 3993736 (1976-11-01), Irani
patent: 4018869 (1977-04-01), Beltz et al.
patent: 4041134 (1977-08-01), Kikuchi et al.
patent: 4070443 (1978-01-01), Kikuchi et al.
patent: 4108963 (1978-08-01), Cuer et al.

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