Leakage and swell in emulsion liquid membrane systems: Comparing continuous stirred-tank reactor and batch experiments

다국어 초록 (Multilingual Abstract)

Emulsion liquid membrane (ELM) systems can efficiently extract and concentrate dilute solutes in avariety of applications and chemistries. Internal phase leakage and swell reduce extraction efficiency andconcentration, which limits their use. Nearly all studies of ELM leakage and swell have been conducted inbatch systems, although continuousflow systems are preferred for industrial applications. The objectiveof this investigation was to assess the ability of batch experiments to predict continuous systemperformance with respect to internal phase leakage and swell. The effects offive factors (surfactantconcentration, osmotic pressure, membrane viscosity, internal phase volume fraction, and extractionvessel stir rate) on leakage and swell were measured in a continuous stirred-tank reactor (CSTR) systemwithout solute extraction. The results were compared with those reported previously for a batch systemwith the same experimental conditions and vessel geometry. Overall, the effects of thefive factors in theCSTR system are qualitatively consistent with the batch system observations, suggesting that theinfluential variables in the batch system are similarly influential in the CSTR system. Leakage and swell inthe CSTR and batch systems are correlated with similar amounts of swell in both systems but consistentlysmaller leakage in the CSTR configuration.

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