Extraction of metal ions from waste water. Modelling of the mass transfer in a supportedliquid-membrane process

Heavy metal removal and recovery by contained liquid membrane permeator

“…The expressions for extraction and stripping were also verified by Yi and Tavlarides (1992) for copper permeation through LIX 84. The forward and reverse reaction rate constants obtained earlier by Haan et al (1989) are close to the values obtained by Yi and Tavalrides (1992).…”

“…Equations 9 and 15 were also used by Haan et al (1989) for copper extraction and stripping by two membrane contactors. Teramoto and Tanimoto (1983) have used similar expressions for copper permeation through SME 529.…”

Stripping dispersion hollow fiber liquid membrane containing PC-88A as carrier and HCl for transport behavior of trivalent dysprosium

“…In SDHFLM, dispersion solution can contribute to supply carrier to the membrane system under the condition of high-speed flowing, so the flow rate of solution in shell side have not obvious effect on the transport efficiency of Dy 3+ . The flow rate of feed solution in tube side have a few effects on the transport efficiency of Dy 3+ , because feed solution diffusion rate in boundary layer of tube side is an important rate control step in the whole transport processes [20,21]. In following experiments, flow rate of dispersion solution in shell side was kept approximately within 5.0 mL min −1 and flow rate of feed solution in tube side was confined to 10.0 mL min −1 .…”

Mass Transfer Investigation of Organic Acid Exatraction with Trioctylamine and Aliquat 336 Dissolved in Various Solvents

“…where σ is the thickness of the hollow fibre, τ is the membrane totuosity, ε is the membrane porosity and D m is the molecular diffusivity of the carrier-solute complex Other equations have also been used by researchers in this field (de Haan, et al, 1989;Hu and Wiencek, 1998). For the organic phase flowing through the shell side of the contactor, the value of (k o ) can be estimated using the following equation (Yang and Cussler, 1986): It is concluded that the estimation by any empirical correlation mentioned in the literature require a description of the specific system, the characteristics of the fibres and contactor, the physical and transport properties of the system under study, the operating conditions and the assumption that the specific system is at least similar to the one where the correlation was developed.…”