Pervaporation of water/ethanol mixtures through polyimide based mixed matrix membranes containing ZIF-8, ordered mesoporous silica and ZIF-8-silica core-shell spheres

  • Kudasheva A
  • Sorribas S
  • Zornoza B
 et al. 
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BACKGROUNDPervaporation (PV) is a prospective industrial process for the sepn. of liq. mixts. such as azeotropic and close-b.p. PV efficiency depends mainly on the properties of the membrane used. Hence, designing a membrane structure with high permeation rate and sepn. factor is an important issue. RESULTSMixed matrix membranes (MMMs) contg. a no. of mol. sieves, i.e. metal org. framework ZIF-8, ordered mesoporous MCM-41 silica spheres of two sizes, 3.1 μm (MSS-1) and 0.53 μm (MSS-2), and ordered mesoporous silica-(ZIF-8) core-shell spheres (MSS-Z8), were prepd. at different filler loadings using polyimide (PI) Matrimid 5218 as polymeric matrix and applied in the dehydration of ethanol via PV. With MSS-2 MMMs the PV flux was improved from 0.24 to 0.44 kg m-2 h-1 without significant changes in the sepn. factor compared with the bare PI membrane. CONCLUSIONSPV performance of the PI membrane was improved by adding different fillers to the polymer matrix, and the effect of porosity, hydrophilicity and particle size of the filler on the PV results was analyzed. The best result in terms of PV performance was obtained with 12 wt% MSS-2 MMM, where the use of smaller particles yielded a superior particle-polymer interfacial area and provided better accessibility to the hydrophilic silica pores. © 2014 Society of Chem. Industry. [on SciFinder(R)]

Author-supplied keywords

  • Ethanol purification
  • Metal organic frameworks
  • Mixed matrix membranes
  • Ordered mesoporous silica
  • Pervaporation

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  • Alina Kudasheva

  • Sara Sorribas

  • Beatriz Zornoza

  • Carlos T??llez

  • Joaqu??n Coronas

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