Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 191, Issue 1-2, Pages 53-59Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0376-7388(01)00448-3
Keywords
zeolite membrane; pervaporation; 1,3-propanediol; glycerol; glucose; ZSM-5 zeolite
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A Na-ZSM-5 zeolite membrane was effective for separating 1,3-propanediol from glycerol and glucose in water by pervaporation. Binary, ternary, and quaternary mixtures were studied as a function of temperature. At 308 K, the total flux for the quaternary feed was 0.21 kg/m(2) h. The 1,3-propanediol/glycerol selectivity decreased from 54 to 21 over the temperature range 308-328 K, whereas for the same range 1,3-propanediol/glucose selectivity increased from 330 to 2100. The 1,3-propanediol/glycerol selectivity was controlled by both preferential adsorption and differences in diffusion rates. The 1,3-propanediol/glucose selectivity was mainly controlled by differences in diffusion rates, with the larger glucose diffusing through non-zeolite pores. Glycerol inhibited glucose permeation and thus increased the 1,3-propanediol/glucose selectivity. The presence of glucose decreased the total flux but increased the 1,3-propanediol/glycerol selectivity. (C) 2001 Elsevier Science B.V. All rights reserved.
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