Synthesis and Pervaporation Performances of Merlinoite and Phillipsite Membranes on Mullite Tube
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For the purpose of screening of zeolite membranes, which are highly resistant to acid, merlinoite (MER) and phillipsite (PHI) membranes were synthesized for the first time, and pervaporation (PV) performance of those membranes were evaluated using 5-95wt% ethanol solution. Each zeolitemembrane was synthesized on a mullite tube by secondary growth of seed crystals, which were rubbedon the outer surface of the tube. The permeance of pure N<SUB>2</SUB> through those membranes was below1.4×10<SUP>-9</SUP>mol/m<SUP>2</SUP>/Pa/s at 50°C. By SEM observation, the thickness of the membrane was 10-50μm. InPV performance, each membrane showed hydrophilic behavior. When ethanol concentration was 90wt% in the feed solution, the permeation fluxes (Q) of the MER and PHI membranes were 0.8-1.1kg/m<SUP>2</SUP>/h at 75°C. The water/ethanol separation factor (°) was over 10, 000 for MER membrane. In the evaluation of stabilities of the zeolite against acid, the changes in the XRD pattern and the compositionof MER and PHI were much smaller in comparison with the case of FAU and CHA. Thus, it can beexpected to use MER and PHI membranes for dehydration directly from the acid solutions likebiomass.
- Clay Science
Clay Science 12, 100-105, 2006-04-01
The Clay Science Society of Japan