Studies on extraction kinetics of phosphoric acid by tributyl phosphate using method of constant interfacial area stirred cell

The extraction kinetics of phosphoric acid in wet-process with hydrochloric acid by tributyl phosphate(TBP) was investigated by using a constant interfacial area stirred cell.The effects of interfacial area between two phases,stirring rate,the initial concentrations of phosphoric acid and hydrochloric acid in aqueous phase on the extraction rate of phosphoric acid were studied.The results showed that the initial forward extraction rate of phosphoric acid increased with the increasing of interfacial area between the two phases,stirring rate,the initial concentrations of phosphoric acid and hydrochloric acid in aqueous phase.The process of phosphoric acid extraction with TBP might be controlled by a diffusion controlling regime.The extraction rate equation of phosphoric acid was established from experimental results as follows:R(H3PO4)=2.51×10-6C(H30PO4)0.70CHCl0.61.