| Association Mechanism Between Propionic Acid and Trioctylamine |
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| 作者姓名： | 李振宇 秦炜 戴猷元 |
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| 作者单位： | LI Zhenyu，QIN Wei **，DAI Youyuan Department of Chemical Engineering，Tsinghua University，Beijing 100084，China |
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| 基金项目： | the National Natural Science Foundationof China(No. 2 9836 130 ) |
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| 摘 要： | IntroductionIn recent years,solvent extraction has receivedmore and more attention for recovery of carboxylicacids from dilute aqueous solutions,especiallywith the hydrophobic tertiary amines dissolved invarious organic diluents18] . Studies on theextrac…
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Association Mechanism Between Propionic Acid and Trioctylamine |
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| Abstract: | Tertiary amines dissolved in diluents are attractive extractants for recovery of carboxylic acids from dilute aqueous solutions. Quantitative Fourier transform infrared (FTIR) analysis of organic solutions containing various concentrations of trioctylamine (TOA), n-octanol, and propionic acid was carried out, and liquid-liquid equilibrium was investigated using TOA in n-octanol as the solvent. The fraction of ion-pair association between TOA and propionic acid in the organic phase was quantitatively determined by FTIR. The apparent reactive extraction equilibrium constant, K11, was calculated using the quantitative FTIR spectrum and the equilibrium data. The results show that the fraction of ion-pair association depends on diluent concentration, complex dissolution for propionic acid, and association between TOA and propionic acid. The K11 based on quantitative FTIR has the same loading trend as that from the equilibrium data. |
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| Keywords: | trioctylamine (TOA) propionic acid ion pair association TOA loading apparent reactive extraction equilibrium constant |
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