A study on the characteristics and pervaporation performance of polyamide thin‐film composite membranes with modified polyacrylonitrile as substrate for bioethanol dehydration |
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| Authors: | Yun‐Hsuan Huang Shu‐Hsien Huang Wei‐Chi Chao Chi‐Lan Li Yun‐Ying Hsieh Wei‐Song Hung Der‐Jang Liaw Chien‐Chieh Hu Kueir‐Rarn Lee Juin‐Yih Lai |
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| Affiliation: | 1. R&D Center for Membrane Technology, Department of Chemical Engineering, Chung Yuan University, , Chung‐Li, 32023 Taiwan;2. Department of Chemical and Materials Engineering, National Ilan University, , I‐Lan, 26047 Taiwan;3. Department of Applied Cosmetology, Taoyuan Innovation Institute of Technology, , Chung‐Li, 32091 Taiwan;4. Department of Chemical Engineering, National Taiwan University of Science and Technology, , Taipei, 10607 Taiwan |
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| Abstract: | To improve the pervaporation performance in separating an aqueous ethanol solution, polyamide thin‐film composite (TFC) membranes (m‐tolidine‐H‐TMC/mPAN) were prepared through the interfacial polymerization reaction between trimesoyl chloride (TMC) and 2,2'‐dimethylbenzidine hydrochloride (m‐tolidine‐H) on the surface of a modified polyacrylonitrile (mPAN) membrane. The effects of the feed ethanol concentration on the pervaporation performance and the durability of m‐tolidine‐H‐TMC/mPAN TFC membranes were investigated. To choose the optimal mPAN membrane as the TFC substrate, the effect of hydrolysis time on the chemical properties and separation performance of an mPAN substrate was also studied. An appropriate hydrolysis time of 15 min was chosen to obtain the mPAN substrate due to the corresponding high permeation flux. The m‐tolidine‐H‐TMC/mPAN TFC membrane exhibited a high pervaporation performance for ethanol dehydration. A positron annihilation lifetime spectroscopy experiment was used to estimate the mean free‐volume radius of the m‐tolidine‐H‐TMC polyamide selective layer, which lay between the radii of the water and ethanol molecules. © 2013 Society of Chemical Industry |
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| Keywords: | PAN membrane hydrolysis polyamide thin‐film composite membrane interfacial polymerization pervaporation positron annihilation lifetime spectroscopy |
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