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首页> 外文期刊>Journal of Applied Polymer Science >Membrane transport of organics. II. Permeation of some carboxylic acids through strongly basic polymer membrane
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Membrane transport of organics. II. Permeation of some carboxylic acids through strongly basic polymer membrane

机译：膜运输有机物。二。某些羧酸透过强碱性聚合物膜渗透

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摘要

The permeability characteristics of the strongly basic polymer membrane Neosepta AFN-7, (Tokuyama Soda) have been studied for acetic, propionic, lactic, tartaric, oxalic, and citric acid. The results were interpreted by using the model of transport in reactive membranes. The specific constants, that is, the maximum flux Jmax, the reactivity constant K, and the permeability coefficient (P), were calculated using the experimental quasi-stationary fluxes and the equation derived as a sum of reaction-diffusion (Michaelis-Menten-type), and the solution-diffusion transport equation. The constants K and Jmax were found to range from 0.1 to 5 dm3 mol-1 and from 0.4×10-7 to 2.5×10-7 mol cm-2 s-1 depending, on the acid properties. The values of K and Jmax were correlated with the dissociation constants Kdis.acid, and the diffusion coefficients Daq.acid in aqueous media, respectively. It was found that the reaction-diffusion flux is predominating for all acids, except for the lactic one, when the feed concentration is lower than 0.5 mol dm-3.
机译：已经研究了强碱性聚合物膜Neosepta AFN-7（Tokuyama Soda）对乙酸，丙酸，乳酸，酒石酸，草酸和柠檬酸的渗透性。通过使用反应膜中的运输模型来解释结果。使用实验性准静态通量和作为反应扩散和的公式推导得出特定常数，即最大通量Jmax，反应常数K和磁导率（P），（Michaelis-Menten-类型），以及溶液扩散输运方程。取决于酸性质，发现常数K和Jmax为0.1至5dm 3 mol-1和0.4×10-7至2.5×10-7mol cm-2 s-1。 K和Jmax的值分别与解离常数Kdis.acid和在水介质中的扩散系数Daq.acid相关。已发现当进料浓度低于0.5mol dm-3时，除乳酸以外的所有酸的反应扩散通量均占主导。

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