Journal
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
Volume 90, Issue 4, Pages 669-677Publisher
WILEY-BLACKWELL
DOI: 10.1002/jctb.4352
Keywords
mixed matrix membranes; metal organic frameworks; ordered mesoporous silica; pervaporation; ethanol purification
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Funding
- Spanish MINECO [MAT2010-15870]
- Aragon Government
- ESF
- EM3E
- DGA
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BACKGROUNDPervaporation (PV) is a prospective industrial process for the separation of liquid mixtures such as azeotropic and close-boiling point. PV efficiency depends mainly on the properties of the membrane used. Hence, designing a membrane structure with high permeation rate and separation factor is an important issue. RESULTSMixed matrix membranes (MMMs) containing a number of molecular sieves, i.e. metal organic framework ZIF-8, ordered mesoporous MCM-41 silica spheres of two sizes, 3.1 mu m (MSS-1) and 0.53 mu m (MSS-2), and ordered mesoporous silica-(ZIF-8) core-shell spheres (MSS-Z8), were prepared at different filler loadings using polyimide (PI) Matrimid (R) 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 0.44kgm(-2)h(-1) without significant changes in the separation 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 12wt% 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. (c) 2014 Society of Chemical Industry
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