Chemistry: fertilizers – Processes and products – Inorganic material
Patent
1984-02-02
1985-03-19
Lander, Ferris H.
Chemistry: fertilizers
Processes and products
Inorganic material
71 43, 423310, C05B 700
Patent
active
045057338
ABSTRACT:
The process for producing liquid combined fertilizers according to the present invention comprises neutralization of extraction-type phosphoric acid with an excess of gaseous ammonia taken in an amount of 1-1.2 parts by weight relative to the content thereof in the final product at a temperature of the reagents of from 60.degree. to 250.degree. C., mixing of the resulting neutralization products with a liquid phase consisting of water or ammonia water and a portion of the final product recycled to the process; said mixing is conducted under a pressure of 0.05-0.7 atm and at an excess of water in the liquid phase of 1.05-2.0 parts by weight relative to the content thereof in the final product; the process is carried out at a ratio of circulation of the final product of 2 to 40 and at a pressure differential at the stages of neutralization and mixing of from 0.1 to 6 atm.
The process according to the present invention may be useful in the agriculture.
REFERENCES:
patent: 3950495 (1976-04-01), Ries
CA 125836c, Ivanov et al., "Technological Production of Complex Liquid Fert. from Extra. Phos. Acid", vol. 76, p. 407, 1972.
CA 112053v, Sidorina et al., "Agrochemical Appraisal of Iron & Aluminum Phosphates . . . Process", vol. 76, p. 396, 1972.
CA 125839f, Gruncharov et al., "Stabilization of Suspensions Prepared During the Ammoniation of Extrac. Phos. Acid", p. 408, vol. 76, 1972.
CA 4837z, Nabiev et al., "Polyphosphoric Acid and Liquid Complex Fertilizers Based on Extraction with Phosphoric Acid", vol. 75, p. 406, 1971.
Golovkina Svetlana I.
Kochetkov Viktor N.
Lembrikov Vladimir M.
Lykov Mikhail V.
Malakhova Nadezhda N.
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