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 3 - 100% TBP – valid from 0.5 to 15 М of HNO 3 in aqueous phase; H 3PO 4- 100% TBP – valid from 0.5 to 15 М of H 3PO 4 in aqueous phase; HNO 3 - H 3PO 4- 100% TBP – valid from 0.5 to 4.5 М of H 3PO 4 and from 0 to 5 M of HNO 3 in aqueous phase; HF - 100% TBP – valid from 0.5 to 15 М of HF in aqueous phase;