Abstract: With alcohol-ester compound extractant as the object,liquid equilibrium of extraction of wet-process phosphoric acid (WPA) solvent was studied.WPA distribution curves of compound extractant-WPA system at the phase equilibrium temperatures of 25,45,60,70 ℃ were measured.Relations of WPA distribution coefficient with temperature,phase ratio,and initial WPA concentration were investigated.Results showed that the compound extractant′s maximum mass fraction of WPA extration did not exceed 50%;the influences of temperature and phase ratio on distribution coefficient were very little,but initial concentration of aqueous phosphoric acid had large influence on distribution coefficient.   

Key words: compound extractant, liquid-liquid equilibrium, distribution coefficient