Vinyl Addition Copolymers of Norbornylnorbornene and Hydroxyhexafluoroisopropylnorbornene for Efficient Recovery of n-Butanol from Dilute Aqueous Solution via Pervaporation
- Authors
- Kang, Beom-Goo; Kim, Dong-Gyun; Register, Richard A.
- Issue Date
- May-2018
- Publisher
- AMER CHEMICAL SOC
- Citation
- MACROMOLECULES, v.51, no.10, pp.3702 - 3710
- Journal Title
- MACROMOLECULES
- Volume
- 51
- Number
- 10
- Start Page
- 3702
- End Page
- 3710
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/39210
- DOI
- 10.1021/acs.macromol.8b00470
- ISSN
- 0024-9297
- Abstract
- The high energy cost to recover heavier alcohols, such as n-butanol, from dilute aqueous solution is a significant practical barrier to their large-scale bioproduction. Membrane pervaporation offers an energy-efficient alternative, provided membrane materials can be developed which provide both good alcohol selectivity and high flux. Previous work has revealed that vinyl addition polynorbornenes bearing substituents-especially hydroxy-hexafluoroisopropyl with an affinity for n-butanol have potential in this application, as their high glass transition temperature allows the formation of thin but mechanically robust selective layers in thin-film composite (TFC) membranes. In the present work, we synthesize both microphase-separated gradient copolymers, and homogeneous random copolymers, of hydroxyhexafluoroisopropylnorbornene (HFANB) with norbornylnorbornene (NBANB) and evaluate their n-butanol/water pervaporation performance. Compared with analogous copolymers of HFANB and n-butylnorbornene (BuNB), the greater n-butanol permeability and selectivity of PNBANB vs PBuNB lead to a more-than-2-fold increase in membrane selectivity for n-butanol transport; the best HFANB NBANB copolymers show n-butanol selectivities and fluxes which compare favorably with those of the best commercial TFC membranes, which contain cross-linked polydimethylsiloxane selective layers. Moreover, vinyl addition copolymers offer a straightforward route to further flux enhancement, simply by reducing the selective layer thickness.
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