PROCESS FOR PRODUCING AN NPK FERTILISER CONTAINING POTASSIUM PHOSPHATE AND AMMONIUM PHOSPHATE
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United States of America
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Dec 12, 2024
app pub date -
Dec 8, 2021
filing date -
Dec 8, 2021
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Abstract
The present invention relates to a process for producing a liquid NPK fertiliser, which is characterised in that the educts K2CO3 or KHCO3, NH4HCO3 and H3PO4 are reacted in aqueous solution to form potassium and ammonium phosphates, in particular to form K3PO4 and (NH4)3PO4, wherein the reaction takes place in a plurality of steps and comprises at least one exothermic reaction and at least one endothermic reaction, and wherein the temperature of the reaction is controlled by regulating the added amount and rate of addition of the respective educts in the various steps such that the reaction mixture is kept in a desired temperature range, throughout the entire reaction without any external cooling or heating devices being required to control the temperature of the reaction.
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