PROCESS FOR THE PRODUCTION OF AMMONIUM/POTASSIUM POLYPHOSPHATE COMPOUNDS FROM POTASSIUM CHLORIDE AND PHOSPHORIC ACID FEEDSTOCKS
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Mar 14, 2014
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Mar 15, 2013
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Abstract
The present invention relates to a continuous ion exchange methodology for production of ammonium-potassium polyphosphate solutions using agricultural grade phosphoric acid, anhydrous ammonia, and agricultural grade potassium chloride (ag potash) as primary feedstocks. The method is particularly applicable to the production of these low salt index, specialty liquid fertilizer solutions and allows for the use of less expensive ag-potash and impure phosphoric acid as the potassium and phosphate sources in order to produce the ammonium-potassium polyphosphate compounds, which are chloride free as a result of the ion ex-change process.
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