Insights into the saponification process of di(2-ethylhexyl) phosphoric acid extractant: Thermodynamics and structural aspects

Add time:08/09/2019    Source:sciencedirect.com

The saponification process of di(2-ethylhexyl)phosphoric acid extractant (D2EHPA) was investigated by the isothermal titration calorimetry (ITC), attenuated total reflection infrared (ATR-IR), and small-angle X-ray scattering (SAXS) spectroscopies. The effects of the temperature, types of saponifier, and diluent on the saponification process of D2EHPA were disclosed by ITC method. The saponification reaction is an exothermic process, but the contribution of temperature on the maximum saponification degree of D2EHPA is slight. The theoretical maximum saponification degree of D2EHPA is about 40%. Moreover, the maximum effective saponification degree of D2EHPA is the same at the condition of different saponifiers because the two systems release the same amount of heat. The effective saponification degree of D2EHPA in octane is larger than that in toluene at the same content of saponifier. The IR spectra indicate that the structure of organic phases varies significantly with the increase of saponification degree. The most water-in-oil microemulsion in the organic phase is formed at the 40% theoretical saponification degree. The water content and SAXS data of organic phase further verify this phenomenon. Solvent extraction results show that the saponified extractant can obviously improve extraction efficiency of cobalt. These results will be helpful for optimizing the saponification process of D2EHPA during metal extraction.

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