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Abstract:
The mass transfer of phenol from feed phase into stripping phase through supported liquid membrane (SLM) was studied by using Celgard2500 porous polypropylene flat-sheet membranes as supports and tributyl phosphate (TBP) dissolved in kerosene as carrier. The composition mole fraction of phenol complex in TBP/kerosene system was 1:1 through the determination of traditional extraction methods, and the value of extraction equilibrium constants was 96.72 at 25.0°C. The effects of pH value, initial mass the concentration in feed phase, stirring speed of the feed and stripping phases, the concentration of TBP in the membrane and the sodium hydroxide concentration in the stripping phase on the mass transfer rate of phenol were also investigated. The optimal conditions of separating phenol through SLM are as follows: the pH value of feed phase is below 9, the phenol initial mass concentration in feed phase is below 1000 mg/L, the stirring speed of the feed and stripping phases is more than 300 r/min, the concentration of TBP in the membrane is 0.55 mol/L, and the sodium hydroxide concentration in the stripping phase is 0.10 mol/L. The mass transfer kinetic equation was determined in terms of double-film theory. Various parameters such as permeability coefficient, thickness of aqueous diffusion layer and diffusion coefficient of phenol through SLM were evaluated by the linear slope method. The calculated results agree well with the experimental data according to the kinetic equation and the deviation between them is within 2%.
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Chemical Engineering (China)
ISSN: 1005-9954
CN: 61-1136/TQ
Year: 2009
Issue: 9
Volume: 37
Page: 32-36
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 3
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