Chemistry: fertilizers – Processes and products – Inorganic material
Patent
1984-12-10
1986-07-29
Doll, John
Chemistry: fertilizers
Processes and products
Inorganic material
423403, C01B 2126
Patent
active
046029281
ABSTRACT:
To make non-pressure nitrogenous fertilizer solutions, nitrogen oxides are prepared in a continuous process by burning ammonia in contact with a cobalt oxide catalyst started by an electric arc without preheating the gases. This burning forms nitrogen oxides which are reacted under negative pressure in a two-stage system. Nitric acid is formed in the first stage from a portion of the oxides by oxidzing them to nitrogen dioxide and reacting the nitrogen dioxide with water. In the second stage, the remaining nitrogen oxides are reacted at a pH between 8.0 and 8.4 in a gas-liquid contacting apparatus with an ammonium hydroxide reaction liquid, formed by mixing ammonia and water. The ammonium nitrite solution formed in the second stage is mixed with the nitric acid at a pH below 0.2, resulting in a solution of acidic ammonium nitrate to be flowed to the fields with irrigation water.
REFERENCES:
patent: 3660024 (1972-05-01), Gillespie
patent: 3904740 (1975-09-01), Kenson et al.
patent: 3947554 (1976-03-01), Senes et al.
patent: 4272336 (1981-06-01), Vayenas et al.
Carney Vincent L.
Doll John
Langel Wayne A.
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