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Production of ammonium potassium polyphosphates
T996001 Production of ammonium potassium polyphosphates
Patent Drawings:Drawing: T996001-2    Drawing: T996001-3    
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Inventor: Sheridan, et al.
Date Issued: July 1, 1980
Application: 06/076,007
Filed: September 17, 1979
Inventors: Frederick; Leland L. (Florence, AL)
McCullough; John F. (Florence, AL)
Sheridan; Richard C. (Sheffield, AL)
Assignee: Tennessee Valley Authority (Washington, DC)
Primary Examiner:
Assistant Examiner:
Attorney Or Agent:
U.S. Class: 423/306; 71/36; 71/51; 71/64.1
Field Of Search:
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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.
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