The thermochemical and kinetic studies of diammonium hydrogen phosphate precipitation in phosphoric acid with ammonia were followed using a microcalorimetry at 25 °C. The calculated thermogenesis curves for various molar ratios show one, two, or three peaks. The plot of the amount of heat measured by integrating the raw signal of the acid–basic reaction presents four domains labeled as ‘a,’ ‘b,’ ‘c,’ and ‘d.’ In ‘a’ and ‘b’ domains, no solid was observed. From the slopes of line segments, it was possible to determine the enthalpies of the first and second neutralization of phosphoric acid (− 57 kJ mol−1 and − 28 kJ mol−1, respectively). However, domains ‘d’ and ‘c’ correspond to precipitation of ammonium dihydrogen phosphate and diammonium hydrogen phosphate. The presence of these compounds was checked by X-ray diffraction analysis performed on the solid precipitated in these domains. The TG, DTG and DTA curves confirm, also, the existence of these solids. The partial order rate with respect to NH3 and to H3PO4 is equal to 1 and 0.5, respectively.
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Brahim, K., Rouissi, K., Soussi-Baatout, A. et al. Thermochemistry and kinetics of the aspect of diammonium hydrogen phosphate precipitation in phosphoric acid solution. J Therm Anal Calorim (2020). https://doi.org/10.1007/s10973-020-09399-z
- Diammonium hydrogen phosphate