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The Study on Pervaporation Behaviors of Dilute Organic Solution Through PDMS/PTFE Composite Membrane

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Abstract

As an energy-efficient alternative to distillation, pervaporation has been widely combined with fermentation to remove organic compounds from their dilute solutions in a fermentation broth. In this work, the organic permselective composite membrane is prepared by coating polydimethylsiloxane (PDMS) cross-linked with n-heptane on the substrate of polytetrafluoroethylene(PTFE) membrane. The separation behavior is studied in different dilute organic solutions, which include acetone dilute solution, butanone dilute solution, cyclohexanone dilute solution, ethanol dilute solution, isopropanol dilute solution, n-butyl alcohol dilute solution, acetic acid dilute solution, and ethyl acetate dilute solution. Most of these solutions are main reaction products or by-products from fermentation process. The effects of solubility of organics in the membrane, molecular weight, and polarity of the organics on the pervaporation performance are investigated. The effects of operating temperature and organic concentration in the feed solutions on the performance of composite membrane are studied as well. The experimental results show that molecular volume has less influence than solubility and molecular polarity for these organic solvent. The selectivity of PDMS membrane to ethyl acetate is relative high due to good solubility and diffusion of ethyl acetate molecules in polymer.

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Acknowledgement

This work was supported by National High Technology Research and Development Program of China (863 Program; No. 2007AA06Z310) and Program for New Century Excellent Talents in University(No. NCET-05-0122).

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  1. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China

    Wei-dong Zhang, Wei Sun, Jing Yang & Zhong-qi Ren

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  1. Wei-dong Zhang
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  2. Wei Sun
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Correspondence to Wei-dong Zhang.

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Zhang, Wd., Sun, W., Yang, J. et al. The Study on Pervaporation Behaviors of Dilute Organic Solution Through PDMS/PTFE Composite Membrane. Appl Biochem Biotechnol 160, 156–167 (2010). https://doi.org/10.1007/s12010-009-8582-3

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