Solution and diffusion properties of cyclohexane,cyclohexanol, and cyclohexanone in poly(ethylene glycol) by inverse gas chromatography |
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Authors: | Chuyi Zeng Min Huang Hong Zhao Jicheng Zhou Jiding Li |
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Affiliation: | 1. Department of Chemical Engineering, Xiangtan University, Hunan 411105, People's Republic of China;2. Chemical Resources Laboratory, Tokyo Institute of Technology, Nagatsuta 4259, Midori‐ku, Yokohama 226‐8503, Japan;3. Membrane Technology and Engineering Research Center, Department of Chemical Engineering, Tsinghua University, Beijing 100084, People's Republic of China |
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Abstract: | The solution and diffusion properties of cyclohexane, cyclohexanol, and cyclohexanone in poly(ethylene glycol) (PEG) and crosslinked PEG have been studied in the temperature range of 368.15 to 403.15 K using inverse gas chromatography (IGC) technique. The infinite dilute activity coefficient (Ω ) and diffusion coefficient (D ) have been determined for the above solvent/polymer systems. Accordingly, several thermodynamic functions, the diffusion pre‐exponential factor, and activation energy have been attained. The results showed a decrease in Ω and an increase in D with rising temperature. The order of the relative magnitude of Ω and D of the solvents were explained by comparing their interactions with the polymer and their collision diameters, respectively. Moreover, Ω and D in crosslinked PEG were smaller than those in PEG at various temperatures. The analysis of Ω , the infinite dilute selectivity and capacity showed the possibility of using crosslinked PEG as an appropriate membrane material for the separation of cyclohexane, cyclohexanol, and cyclohexanone mixture. A thermodynamic study also implied that the solvent sorptions in the polymers were all enthalpically driven in the experimental range. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011. |
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Keywords: | activity coefficient diffusion coefficient poly(ethylene glycol) crosslinked cyclohexanol cyclohexanone |
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