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جزئیات رویداد
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  • effect of viscosity of a liquid membrane containing oleyl alcohol on the pertraction of butyric acid

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1493
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    • شماره تماس دبیرخانه رویداد: -
     solvent formulation is important in the optimization of the mass-transfer through supported liquid membranes (slm) in pertraction and membrane extraction. oleyl alcohol (oa) is frequently used as the solvent or diluent in the extraction of carboxylic acids. a disadvantage of oa is its relatively high viscosity of 28.32 mpa s at 25°c. this can be decreased by the application of a less viscous oa diluent, e.g. dodecane. the relationship between the ratio of the distribution coefficient of butyric acid (ba), d f, and the viscosity of oa-dodecane solvents, µ, as extraction and transport characteristics, and the overall mass-transfer coefficient, k p, through slms was analyzed. dependence of the d f/µ ratio on the oa concentration showed a maximum at the oa concentration of 15 mass % to 30 mass %. the oa concentration dependence of k p for slms exhibited also a maximum at about 30 mass % and 20 mass % of oa at the ba concentration driving force of 0.12 kmol m−3 and 0.3 kmol m−3, respectively. shifting of the maximum in k p dependences towards lower oa concentrations by increasing the ba concentration driving force is in agreement with the d f/µ ratio dependence. using pure oa as the solvent or diluent is not preferable and a mixture of a low viscosity diluent with the oa concentration below 40 mass % should be used. the presented results show the potential of thed f/µ ratio in the screening and formulation of solvents in extraction and slm optimization.

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