Polyrotaxane crosslinked modified EC/PVDF composite membrane displaying simultaneously enhanced pervaporation performanc
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Polyrotaxane crosslinked modified EC/PVDF composite membrane displaying simultaneously enhanced pervaporation performance and solvent resistance for benzene/cyclohexane separation Yuhui Zhang1, Ligang Lin1,* , Qi Wang1, Rongrong Qiang1, Yixin Gao1, Sisi Ma1, Qi Cheng1, and Yuzhong Zhang1 1
State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin 300387, People’s Republic of China
Received: 10 December 2019
ABSTRACT
Accepted: 25 March 2020
A new strategy was proposed that simultaneously improves the pervaporation (PV) performance and solvent resistance via the construction of a movable crosslinked structure in ethyl cellulose/polyvinylidene fluoride (EC/PVDF) composite membrane for the purpose of benzene/cyclohexane separation. Based on the molecular design of the macrocyclic compound cyclodextrin, polyrotaxane crosslinking agent (PR=) with a special sliding/rotating property and cavity structure was successfully synthesized. Furthermore, for convenient comparative study, cyclodextrin crosslinking agent (CD=) with cavity structure bereft of a sliding/rotating property and pentaerythritol triacrylate (PETA) without sliding/rotating property and cavity structure were prepared. The composite membranes were fabricated with crosslinking modified EC as active layer, together with PVDF support layer. The molecular structure and microstructure were confirmed. The pervaporation and swelling performance of the fabricated membranes for benzene/cyclohexane were investigated. PR= modified membranes showed good solvent resistance and exhibited a flux of 4332 gm-2h-1 and separation factor of 6.26, which was higher than CD= and PETA modified membranes. The results were attributed to the facilitated transport behavior, which was markedly related with the sliding/rotating property and cavity structure of polyrotaxane (PR). The related research provides interesting suggestions for PV membrane design for the separation of organic mixtures.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
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https://doi.org/10.1007/s10853-020-04609-3
J Mater Sci
Introduction Membrane separation is an emerging technology with great potential application prospects, which is widely used in solving resources and industrial application problems [1, 2]. Pervaporation (PV) is a popular membrane separation technology for dehydration of solvents, water purification, biofuel production and organic/organic separation, stemming from its high separation efficiency, ability to break the azeotrope and low energy consumption. It is well known that the majority of PV commercial plants in operation are for dehydration processes. Recently, the separation of organics such as benzene/cyclohexane by pervaporation has attracted considerable attention. Benzene plays a key role in industrial applications. Cyclohexane is produced via catalytic hydrogenation of benzene. Since cyclohexane and benzene possess similar boiling points, unreacted be
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