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- W3020919785 abstract "Countercurrent extraction is an efficient separation operation to be widely used in chemical industry. However, it is a challenge to realized countercurrent extraction in microchannel. Liquid-liquid countercurrent extraction was successfully realized in mini-channels with internal diameters of 3 mm–7 mm. Aqueous solution of succinic acid was used as continuous phase and flowed downward along the channel by gravity, n-butanol was used as dispersed phase and flowed upward by buoyancy. The droplet flow behaviors and the mass transfer characteristics were investigated systematically. The superficial velocitiesof aqueous solution ranged from 2.64 × 10−4 m/s–1.32 × 10−3 m/s, the orifice velocities of organic liquid ranged from 0.175 m/s to 1.40 m/s. The internal diameters of mini-channels varied from 3 mm to 7 mm, the lengths of mini-channels varied from 200 mm to 400 mm, and the nozzle diameters were between 0.11 mm and 0.29 mm. Three droplet formation regimes were observed, including down-dripping, dripping and jetting. Two flow patterns including monodispersed droplets pattern and chaotic droplets pattern were also observed. The volumetric mass transfer coefficients KLa were between 1.56 × 10−4 and 1.28 × 10−2s−1, which are 2–10 times of that in traditional extractors. An empirical correlation was developed based on the dimensionless analysis. It predicted the volumetric mass transfer coefficients within the deviation of ±20%." @default.
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- W3020919785 date "2020-12-01" @default.
- W3020919785 modified "2023-10-18" @default.
- W3020919785 title "Mass transfer and droplet formation regime in a countercurrent mini-channel extractor" @default.
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- W3020919785 doi "https://doi.org/10.1016/j.cej.2020.125383" @default.
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