Intensification of countercurrent extraction with high phase ratio via integrating an annular rotating flow with micro-capillary jetting dispersion

Countercurrent extraction with extreme phase ratio widely exists in many fields. However, it remains a great challenge for its low efficiency because of poor dispersion and unstable two-phase flow. In this work, we take the extraction of H 2 O 2 from the working solution as an example and develop a novel intensification technology via integrating the annual rotating flow with micro-capillary jetting dispersion. The phase whose volume flow rate is much smaller is ejected into the continuous phase by micro-capillary jetting to form microdroplets. The annular rotating field is introduced to stabilize the flow and reduce the extraction resistance. The microdispersion, two-phase countercurrent flow, and extraction characteristics are systematically studied. The results show that three theoretical stages in 60 cm with an operation capacity of 43.6 m 3 /(m 2 ·h) are successfully achieved when the phase ratio exceeds 50. This new technology may become a general way for extraction intensification with the extreme phase ratio.