TY - JOUR
T1 - Transport mechanisms of water and organic solvents through microporous silica in the pervaporation of binary liquids
AU - ten Elshof, Johan E.
AU - Rubio Abadal, Cristina
AU - Sekulic, J.
AU - Roy Chowdhury, S.
AU - Blank, David H.A.
PY - 2003
Y1 - 2003
N2 - Pervaporation experiments were performed on microporous silica membranes in the temperature range 30–80 °C using binary liquids containing 5–22 wt.% water. The organic solvents used were methanol, N,N-dimethylformamide (DMF) and 1,4-dioxane. The dependency of flux and selectivity on temperature and feed composition were investigated. The results were interpreted in terms of the Maxwell–Stefan theory, and Maxwell–Stefan diffusion coefficients at 60 °C were estimated. Water, methanol and DMF were found to diffuse through silica by a surface diffusion mechanism, while 1,4-dioxane was transported mainly by viscous flow through mesopores or small defects. DMF inhibited the transport of water, which may be explained by micropore blocking by strongly adsorbed DMF molecules. The flux of methanol appears to be dominated by a dragging effect by the larger water flux.
AB - Pervaporation experiments were performed on microporous silica membranes in the temperature range 30–80 °C using binary liquids containing 5–22 wt.% water. The organic solvents used were methanol, N,N-dimethylformamide (DMF) and 1,4-dioxane. The dependency of flux and selectivity on temperature and feed composition were investigated. The results were interpreted in terms of the Maxwell–Stefan theory, and Maxwell–Stefan diffusion coefficients at 60 °C were estimated. Water, methanol and DMF were found to diffuse through silica by a surface diffusion mechanism, while 1,4-dioxane was transported mainly by viscous flow through mesopores or small defects. DMF inhibited the transport of water, which may be explained by micropore blocking by strongly adsorbed DMF molecules. The flux of methanol appears to be dominated by a dragging effect by the larger water flux.
KW - METIS-215284
KW - IR-40847
U2 - 10.1016/j.micromeso.2003.08.010
DO - 10.1016/j.micromeso.2003.08.010
M3 - Article
VL - 65
SP - 197
EP - 208
JO - Microporous and mesoporous materials
JF - Microporous and mesoporous materials
SN - 1387-1811
IS - 2-3
ER -