METHOD OF PREPARING DIAMMONIUM PHOSPHATE

preparation of diammonium phosphate for various types of soils. SUBSTANCE: method comprises stage by stage neutralization of mixture of sulfuric and phosphoric acids to molar ratio of NH3:H3PO4= 1,4 and then to 1.75, granulation, drying the product and subsequently purifying the off-gases in two sta...

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Main Authors KLASSEN P.V, NOROV A.M, CHERNENKO JU.D, LEVICHEV N.A, BRODSKIJ A.A, KLADOS D.K, MARKOVA M.L, GRINEVICH A.V
Format Patent
LanguageEnglish
Published 10.07.2000
Edition7
Subjects
CHEMISTRY
FERTILISERS
MANUFACTURE THEREOF
METALLURGY
PHOSPHATIC FERTILISERS
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Summary:preparation of diammonium phosphate for various types of soils. SUBSTANCE: method comprises stage by stage neutralization of mixture of sulfuric and phosphoric acids to molar ratio of NH3:H3PO4= 1,4 and then to 1.75, granulation, drying the product and subsequently purifying the off-gases in two stages, first with pulp of ammonium phosphates and then with phosphoric acid. Phosphoric acid fed to neutralization is mixture of evaporated and unevaporated acids which are premixed in amounts required to attain F:P2O5 of 0.03-0.05 and concentration of 40-46%. EFFECT: plastic surface of the resulting granules the strength of which does not exceed 30-40 kgf/sq.cm
Bibliography:Application Number: RU19990116992