ZIF-8 incorporated into chitosan membrane to enhance separation in organic-organic pervaporation
(2021) Euromembrane Conference 2021 — Location: Copenhagen, Denmark (28.November.2021)
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- Separation of organic-organic mixtures using pervaporation is a current challenge that has attracted the interest of the research community due to the enormous potential of this technology considering its low energy consumption ([1]). For example, valorisation of glycerol as a platform molecule to produce glycerol carbonate is of utmost interest, but it involves the reaction of glycerol with dimethyl carbonate to produce glycerol carbonate and methanol as byproduct ([2-4]). This reaction is limited by the equilibrium and an azeotrope between dimethyl carbonate and methanol is also present. Thus, the low yield and high separation costs using conventional technology make this process uninteresting for a real application. In this work, we present pervaporation as the alternative technology to minimise energy consumption. Novel membranes are proposed to selectively separate methanol from the organic mixture. With porous metal-organic frameworks as fillers, mixed matrix membranes (MMMs) can significantly improve the separation performance in contrast with corresponding pristine polymeric membranes. Nanoscale ZIF-8 particles were embedded uniformly into chitosan (CS) matrix to prepare CS/ZIF-8 MMMs and were used for the pervaporation separation of methanol-dimethyl carbonate mixtures. Benefiting from the flexible framework, high surface area and high affinity of ZIF-8 crystals with CS matrix, the methanol permeance of CS/ZIF-8 MMMs was significantly increased without compromising the membrane selectivity. The results depicted that CS membrane loaded with 15 wt% ZIF-8 showed a high methanol permeance of 82.9 GPU and selectivity of methanol/DMC of 18.42 which was 361.3 % and 9.4% higher when compared to pristine CS membrane. Thus ZIF-8 doped CS mixed matrix membrane serves as a potential candidate for industrial pervaporation studies.
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Xu, X., & Luis Alconero, P. (2021). ZIF-8 incorporated into chitosan membrane to enhance separation in organic-organic pervaporation. Euromembrane Conference 2021, Copenhagen, Denmark. https://hdl.handle.net/2078.5/104781