Gas‐liquid‐liquid flow patterns and extraction in a rotating microchannel extractor

다국어 초록 (Multilingual Abstract)

The flow patterns of gas‐liquid‐liquid three‐phase fluids in the rotating microchannel extractor (RME) were studied in this paper. The kerosene‐water system without mass transfer and the 2%P507‐22%NaH2PO4 system with mass transfer were considered. The influence of interfacial tension, microchannel structure, and rotation rate on three‐phase flow patterns were investigated. Eight different flow patterns such as droplet‐continuous flow, long droplet‐continuous flow, filiform parallel‐continuous flow, filiform parallel‐filiform parallel flow, small droplet‐continuous flow, filiform parallel‐small droplet flow, small droplet‐small droplet flow, and continuous‐filiform parallel flow were observed. The results showed that the proposed universal flow pattern map can effectively predict the flow patterns of the two systems and the small droplet‐small droplet flow has the best effect of extracting Fe3+ from the 2%P507‐22%NaH2PO4 system. The traditional first‐order equilibrium extraction efficiency was 102% while the percentage extraction was up to 85% (14.4 mg/L) after one stage extraction and about 97.9% (2.0 mg/L) after two‐stage extraction.