EXTRACTION SIMULATION OF NITRIC, FLUORIC AND PHOSPHORIC ACIDS BY TRI-N-BUTYLPHOSPHATE
The mechanism of mineral acids extraction for the system Acid- 100% TBP has been proposed. The set of thermodynamic constants and non-ideality parameters to simulate adequately the acids extraction in the range of experimental errors has been revealed for the following systems: HNO <sub>3 </sub>- 100% TBP – valid from 0.5 to 15 М of HNO <sub>3 </sub>in aqueous phase; H <sub>3</sub>PO <sub>4</sub>- 100% TBP – valid from 0.5 to 15 М of H <sub>3</sub>PO <sub>4 </sub>in aqueous phase; HNO <sub>3 </sub>- H <sub>3</sub>PO <sub>4</sub>- 100% TBP – valid from 0.5 to 4.5 М of H <sub>3</sub>PO <sub>4 </sub>and from 0 to 5 M of HNO <sub>3 </sub>in aqueous phase; HF - 100% TBP – valid from 0.5 to 15 М of HF <sub></sub>in aqueous phase;