Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing
Patent
1979-03-01
1981-06-23
Carter, Herbert T.
Chemistry of inorganic compounds
Phosphorus or compound thereof
Oxygen containing
423309, C01B 2516
Patent
active
042750385
ABSTRACT:
In a process for purifying an aqueous phosphoric acid containing up to about 55% P.sub.2 O.sub.5 by weight and dissolved magnesium, iron and aluminum ions, wherein (a) said phosphoric acid is contacted with an organic extractant containing a water immiscible organic sulfonic acid to form: a loaded organic extractant phase containing the organic sulfonic acid, extracted ionic metallic impurities and extracted P.sub.2 O.sub.5 values, and a purified aqueous phosphoric acid; (b) the purified aqueous phosphoric acid phase is separated from the loaded organic extractant phase; (c) the separated loaded organic extractant phase is contacted with a solution phase containing calcium ions (e.g., calcium nitrate), under conditions whereby at least some of said extracted ionic metallic impurities (e.g., Mg.sup.+2, Al.sup.+3, Fe.sup.+3) are replaced by calcium and are transferred to said solution phase; and (d) the solution phase is separated from the contacted extractant phase; the improvement wherein the separated solution phase from step (d) is made basic, preferably with lime, to cause a solid precipitate to form, said solid precipitate comprising at least some of the metallic impurities and/or P.sub.2 O.sub.5 values from phosphoric acid which was entrained in the organic extractant. The separated solid precipitate is useful as a nutrient (e.g., as a fertilizer or as an animal feed supplement). Where sulfuric acid is used for the acidification, solid calcium sulfate forms, which can be separated from the "used" acid. The sulfuric acid can be strengthened with fresh, more concentrated, acid and recycled.
REFERENCES:
patent: 3694153 (1972-09-01), Williams et al.
patent: 4053564 (1977-10-01), Bradford et al.
patent: 4082836 (1978-04-01), Ore
patent: 4118462 (1978-10-01), Desire et al.
patent: 4132540 (1979-01-01), Edwards et al.
Adam Donald E.
Sikdar Subhas K.
Winterbottom Howard
Bisson Barry A.
Carter Herbert T.
Heller Gregory A.
Occidental Research Corporation
Patrick William N.
LandOfFree
Process for treating loaded extractant from purification of phos does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for treating loaded extractant from purification of phos, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for treating loaded extractant from purification of phos will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2207540