To solve the problems of phase separation difficulty

extractant loss and large equipment existing in the liquid-liquid extraction system

a solvent extraction method with coaxial microchannel device was applied to prepare polysulfone microcapsules and the extraction performance of Sm3+ by microcapsules containing P507 was investigated and optimized. Extraction kinetics

stripping property and stability of microcapsules containing P507 was studied systematically. The advantages of microcapsule system were highlighted

i.e.

simple operation

little extractants loss and high stability. To enhance the mass transfer

and improve extraction and stripping rate

P507 was diluted with kerosene and the extraction performance in the liquid-liquid system was studied. The best extraction performance was obtained when the volume fraction of P507 in solution was 40%. Compared with microcapsules containing pure P507

the extraction performance of microcapsules containing 40%(vol) P507/60%(vol) kerosene was significantly promoted-the extraction equilibrium time was shortened from 120 min to 40 min

the equilibrium capacity was improved from 45.09 mg·(g P507)-1 to 69 mg·(g P507)-1

the utilization of P507 was increased from 55% to 84%

and the equilibrium stripping time was decreased from 600 min to 120 min. In conclusion

the diluting P507 with kerosene can effectively improve the extraction kinetics

equilibrium extraction capacity and stripping rate. 20 cycles of extraction and stripping demonstrated a good stability of microcapsules after diluting P507 with kerosene.