Production of ammonium potassium polyphosphates

Details Production of ammonium potassium polyphosphates Production of ammonium potassium polyphosphates

1980-02-13

1981-12-29

Bashore, S. Leon

Chemistry: fertilizers

Processes and products

Inorganic material

71 29, 71 6410, C05B 700, C05B 1306

Patent

active

043080480

ABSTRACT:
Embodiment No. 1. Urea phosphate prepared from wet-process phosphoric acid is heated with monopotassium orthophosphate in a mole ratio of 0.25 to 4.0 at 130.degree. to 200.degree. C. to form an ammonium potassium polyphosphate having an average chain length between 1.2 and 2.5. The ammonium potassium polyphosphate is dissolved in aqueous ammonia to yield concentrated fertilizer solutions containing the three major nutrients and over 50 percent total plant food.
Embodiment No. 2. Phosphoric acid containing 54 to 76 percent P.sub.2 O.sub.5 is heated with urea (urea:H.sub.3 PO.sub.4 mole ratio 0.5 to 2.0) and monopotassium orthophosphate (urea:KH.sub.2 PO.sub.4 mole ratio 0.25 to 4.0) at 130.degree. to 200.degree. C. to form an ammonium potassium polyphosphate having an average chain length between 1.2 and 2.5. The ammonium potassium polyphosphate is dissolved in aqueous ammonia to yield concentrated fertilizer solutions containing the three major nutrients and over 50 percent total plant food.

REFERENCES:
patent: T973004 (1978-08-01), Stinson et al.
patent: 3347656 (1967-10-01), Potts et al.

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