Details
| Original language | English |
|---|---|
| Pages (from-to) | 288-293 |
| Number of pages | 6 |
| Journal | Microporous and Mesoporous Materials |
| Volume | 164 |
| Early online date | 28 Jul 2012 |
| Publication status | Published - 1 Dec 2012 |
Abstract
The metal-organic framework (MOF) ZIF-8 (ZIF-8 = zeolitic imidazolate framework-8) was evaluated as molecular sieve membrane in the pervaporation of the two liquid mixtures n-hexane/benzene and n-hexane/mesitylene. Though it is known from permeation studies of light gases that ZIF-8 membranes show no sharp separation cut-off at the estimated crystallographic pore size of 3.4 Å, highly branched or aromatic hydrocarbons > C 5 could be expected therefore to become rejected by the ZIF-8 pores thus remaining in the retentate. However, the ZIF-8 membrane shows for n-hexane and benzene remarkable fluxes. Under consideration of the leakage of the apparatus, we can state that n-hexane and benzene can pass the ZIF-8 membrane. Benzene had a lower flux than n-hexane, whereas for mesitylene we could only observe a very small leakage rate through the O-ring gasket. Correspondingly, medium mixture separation factors have been found for the pervaporation separation of a liquid n-hexane/benzene mixture. Additional mixed gas hydrogen/methane separations, adsorption experiments and leak rate measurements were carried out to evaluate the results.
Keywords
- Breathing, Gate opening, Pervaporation, ZIF-8 membrane
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanics of Materials
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In: Microporous and Mesoporous Materials, Vol. 164, 01.12.2012, p. 288-293.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Pervaporation studies of n-hexane, benzene, mesitylene and their mixtures on zeolitic imidazolate framework-8 membranes
AU - Diestel, Lisa
AU - Bux, Helge
AU - Wachsmuth, Dennis
AU - Caro, Jürgen
PY - 2012/12/1
Y1 - 2012/12/1
N2 - The metal-organic framework (MOF) ZIF-8 (ZIF-8 = zeolitic imidazolate framework-8) was evaluated as molecular sieve membrane in the pervaporation of the two liquid mixtures n-hexane/benzene and n-hexane/mesitylene. Though it is known from permeation studies of light gases that ZIF-8 membranes show no sharp separation cut-off at the estimated crystallographic pore size of 3.4 Å, highly branched or aromatic hydrocarbons > C 5 could be expected therefore to become rejected by the ZIF-8 pores thus remaining in the retentate. However, the ZIF-8 membrane shows for n-hexane and benzene remarkable fluxes. Under consideration of the leakage of the apparatus, we can state that n-hexane and benzene can pass the ZIF-8 membrane. Benzene had a lower flux than n-hexane, whereas for mesitylene we could only observe a very small leakage rate through the O-ring gasket. Correspondingly, medium mixture separation factors have been found for the pervaporation separation of a liquid n-hexane/benzene mixture. Additional mixed gas hydrogen/methane separations, adsorption experiments and leak rate measurements were carried out to evaluate the results.
AB - The metal-organic framework (MOF) ZIF-8 (ZIF-8 = zeolitic imidazolate framework-8) was evaluated as molecular sieve membrane in the pervaporation of the two liquid mixtures n-hexane/benzene and n-hexane/mesitylene. Though it is known from permeation studies of light gases that ZIF-8 membranes show no sharp separation cut-off at the estimated crystallographic pore size of 3.4 Å, highly branched or aromatic hydrocarbons > C 5 could be expected therefore to become rejected by the ZIF-8 pores thus remaining in the retentate. However, the ZIF-8 membrane shows for n-hexane and benzene remarkable fluxes. Under consideration of the leakage of the apparatus, we can state that n-hexane and benzene can pass the ZIF-8 membrane. Benzene had a lower flux than n-hexane, whereas for mesitylene we could only observe a very small leakage rate through the O-ring gasket. Correspondingly, medium mixture separation factors have been found for the pervaporation separation of a liquid n-hexane/benzene mixture. Additional mixed gas hydrogen/methane separations, adsorption experiments and leak rate measurements were carried out to evaluate the results.
KW - Breathing
KW - Gate opening
KW - Pervaporation
KW - ZIF-8 membrane
UR - http://www.scopus.com/inward/record.url?scp=84867403619&partnerID=8YFLogxK
U2 - 10.1016/j.micromeso.2012.06.031
DO - 10.1016/j.micromeso.2012.06.031
M3 - Article
AN - SCOPUS:84867403619
VL - 164
SP - 288
EP - 293
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
SN - 1387-1811
ER -