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ZSM‐11 membranes: Characterization and pervaporation performance
Author(s) -
Li Shiguang,
Tuan Vu A.,
Noble Richard D.,
Falconer John L.
Publication year - 2002
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690480211
Subject(s) - pervaporation , chemistry , methanol , alcohol , membrane , aqueous solution , adsorption , propanol , ethanol , inorganic chemistry , organic chemistry , chromatography , permeation , biochemistry
High‐quality boron and aluminium‐substituted ZSM‐11 membranes were prepared on porous tubular supports to separate alcohols from water by pervaporation. The C 1 –C 3 alcohols were preferentially separated from aqueous solutions through the B‐ZSM‐11 membrane, and the maximum flux was 1.7 kg/m 2 ·h for a 5 wt.% methanol/water mixture. The alcohol fluxes decreased as the carbon number increased. The methanol/water separation selectivity decreased with pervaporation temperature, but other alcohol/water selectivities increased. All selectivities increased with decreasing alcohol feed concentration. In a range of 1 to 50 wt. % alcohol, the separation selectivities at 333 K for the C 1 –C 3 linear alcohols were higher than vapor/liquid equilibrium selectivities. The highest selectivities observed for methanol/water, ethanol/water, 1‐propanol/water, and 2‐propanol/water were 28, 97, 34, and 26, respectively, at 1 wt. % alcohol feed concentrations. The separation selectivities were based on both preferential adsorption of alcohols and differences in diffusion rates.