Abstract
This study evaluates the equilibrium characteristics of H3PO4 and KCl for the production of KH2PO4 by liquid, liquid extraction with organic solvent mixtures (trialkyl amine N235, isoamyl alcohol, and sulfonated kerosene). The extraction equilibrium for aqueous H3PO4 or for the reaction of H3PO4 with KCl was obtained. For the former case, the partition coefficient for extracting a standard H3PO4 solution first decreased rapidly and then slowly increased with the increase in H3PO4 content. In addition, the reaction enthalpy also showed a turning point. For the latter case, aqueous H3PO4 reacted with KCl and the organic phase separated the Cl– ions from PO43– to produce KH2PO4. The acid content presented a significant effect on the correlation between the separation performance and the molar ratio of H3PO4 to KCl. This was due to the fact that N235 dominated the partition process at low acid concentrations while the isoamyl alcohol dominated the extraction at high acid concentrations with the transition occ...
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