Chemistry: fertilizers – Processes and products – Inorganic material
Patent
1974-01-04
1976-03-30
Spear, Jr., Frank A.
Chemistry: fertilizers
Processes and products
Inorganic material
71 29, C05B 700
Patent
active
039472612
ABSTRACT:
Ammonium polyphosphate is produced in a pipe reactor by injecting a stream of ammonia countercurrent to superphosphoric acid passed axially through the reaction zone to cause vigorous backmixing of the two reactants and yield a melt of ammonium polyphosphate, and cooling the sidewalls of the pipe reactor sufficiently to form a layer of ammonium polyphosphate melt thereon to prevent formation of insoluble scale on the interior of the reactor. The resulting ammonium polyphosphate melt is then dissolved in recycled aqueous ammonium polyphosphate product solution and thereafter further diluted with water to form the product solution. In specific embodiments, minor but effective amounts of urea are added to the acid feed to diminish the tendency of insoluble scale from forming on the interior of the reaction zone, and to improve the stability and conversion of the product solution.
REFERENCES:
patent: 3301657 (1967-01-01), Dee et al.
patent: 3342579 (1967-09-01), Frazier
patent: 3464808 (1969-09-01), Kearns
patent: 3503706 (1970-03-01), Legal, Jr.
patent: 3544299 (1970-12-01), Fitz-William et al.
patent: 3723074 (1973-03-01), Sears et al.
patent: 3723086 (1973-03-01), Poynor et al.
Edwards Thomas A.
Hodges John W.
Sale Ernest W.
Agrico Chemical Company
Lander Ferris H.
Spear, Jr. Frank A.
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