Chemistry: fertilizers – Processes and products – Organic material-containing
Patent
1975-09-29
1976-07-06
Hart, Charles N.
Chemistry: fertilizers
Processes and products
Organic material-containing
71 30, 71 39, 71 50, 71 58, 423321R, C05C 100
Patent
active
039679489
ABSTRACT:
My invention relates to a new method for purification of wet-process phosphoric acid with co-production of nitrogen solution. The crude acid is treated with urea by known processes to form urea phosphate free of most of the impurities in the crude acid. The urea phosphate is treated with concentrated nitric acid to form solid urea nitrate and phosphoric acid. The purified phosphoric acid is separated from the urea nitrate and withdrawn as product. The urea nitrate is washed with concentrated nitric acid and the wash soluton then is used for reaction with urea phosphate. The washed urea nitrate is then treated with ammonia and water to form nitrogen solution.
REFERENCES:
patent: 3723086 (1973-03-01), Poynor et al.
New Developments in Fertilizer Technology, TVA 10th Demostration, Oct. 1974, pp. 11 and 12.
Hart Charles N.
Petrusek Robert A.
Tennessee Valley Authority
Therkorn Ernest G.
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