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Effects of Zeolite Membrane Structure on the Separation of 1,3-Propanediol from Glycerol and Glucose by Pervaporation

2001; American Chemical Society; Volume: 13; Issue: 5 Linguagem: Inglês

10.1021/cm000907w

1520-5002

Shiguang Li, Vũ Anh Tuấn, John L. Falconer, Richard D. Noble,

Mesoporous Materials and Catalysis

Seven types of zeolite membranes were synthesized on the inside surfaces of alumina and stainless steel supports. The medium-pore membranes (MFI, MEL, and a MFI + MEL composite) were prepared by using organic templates, whereas the larger pore membranes (MOR, FAU) were prepared by a template-free method. These membranes were used in pervaporation to separate 1,3-propanediol from glycerol and glucose in an aqueous solution. All membranes had 1,3-propanediol/glycerol selectivities higher than 27, and zeolite pore size did not have a large influence on membrane selectivity, which was mainly due to preferential adsorption of 1,3-propanediol. The 1,3-propanediol/glucose selectivities were higher than 1600 for all membranes because the selectivities were mainly controlled by molecular sieving. Zeolite structure had a significant effect on the pervaporation flux; the larger pore membranes had higher fluxes. At 308 K, the X-type membrane had the largest 1,3-propanediol flux of 62 g/(m2 h), with a 1,3-propanediol/glycerol selectivity of 59.