caa a22 4500 463170652 CHVBK 20180406164812.0 cr unu---uuuuu 170326e20070401xx s 000 0 eng 10.1007/s10450-007-9010-z doi (NATIONALLICENCE)springer-10.1007/s10450-007-9010-z Can alkane isomers be separated? Adsorption equilibrium and kinetic data for hexane isomers and their binary mixtures on MFI [Elektronische Daten] [Alexandre Ferreira, Marjo Mittelmeijer-Hazeleger, Alfred Bliek] In this study we present a global overview of the adsorption behavior of hexane isomers on MFI. With an experimental approach that couples a manometric technique with Near Infrared (NIR) spectroscopy, which has been recently developed, we did address adsorption kinetic properties of n-hexane, 2-methylpentane, 2,2-dimethylbutane and 2,3-dimethylbutane, and their binary mixtures. The adsorption equilibrium properties of the binary mixtures were also assessed using the same technique. Whereas the adsorption isotherms and heats of adsorption for single components have been studied by a manometric technique coupled with a micro calorimeter. The differential heats of adsorption of n-hexane increase slightly with loading, on the other hand the heat of adsorption of branched hexanes exhibits a decrease with loading. The diffusion rates on MFI of n-hexane, 2-methylpentane and 2,3-dimethylbutane are in the same order of magnitude. However, the diffusion rate of 2,2-dimethylbutane is two orders of magnitude lower than rates of the other isomers. In the binary mixtures the components interact and the difference between the diffusion rates of the components decreases. The MFI zeolite presents equilibrium selectivity towards the less branched isomers. In conclusion, a separation process for linear/mono-branched alkanes + double-branched alkanes, has to be based on its equilibrium properties and not based on adsorption kinetics. Springer Science+Business Media, LLC, 2007 Zeolites nationallicence Alkanes nationallicence Isotherms nationallicence Differential heat of adsorption nationallicence D : diffusivity, m2⋅s−1 nationallicence D c : uptake diffusivity, m2⋅s−1 nationallicence D / r 2 : diffusion time constant, s−1 nationallicence K C : adsorption equilibrium constant in the channels, kPa−1 nationallicence K I : adsorption equilibrium constant in the intersections, kPa−1 nationallicence K H : Henry's Law constant, mmol⋅g−1⋅kPa−1 nationallicence p : pressure (adsorbate concentration in the gas phase), Pa nationallicence Q 0 : initial heat of adsorption, kJ⋅mol−1 nationallicence q : loading (adsorbate concentration in the particles), mmol⋅g−1 nationallicence q sat , C : saturation loading in the channels, mmol⋅g−1 nationallicence q sat , I : saturation loading in the intersections, mmol⋅g−1 nationallicence q t : adsorbed amount at time t, mmol⋅g−1 nationallicence q inf : adsorbed amount at equilibrium, mmol⋅g−1 nationallicence r : particle radius, m nationallicence V s : the volume of the sample, cm3 nationallicence V g : the volume of apparatus, cm3 nationallicence α : K c V s /V g ,(−) nationallicence Ferreira Alexandre HIMS—Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV, Amsterdam, The Netherlands aut Mittelmeijer-Hazeleger Marjo HIMS—Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV, Amsterdam, The Netherlands aut Bliek Alfred HIMS—Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV, Amsterdam, The Netherlands aut Adsorption Springer US; http://www.springer-ny.com 13/2(2007-04-01), 105-114 0929-5607 13:2<105 2007 13 10450 https://doi.org/10.1007/s10450-007-9010-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10450-007-9010-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ferreira Alexandre HIMS—Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV, Amsterdam, The Netherlands aut NATIONALLICENCE 700 1- Mittelmeijer-Hazeleger Marjo HIMS—Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV, Amsterdam, The Netherlands aut NATIONALLICENCE 700 1- Bliek Alfred HIMS—Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV, Amsterdam, The Netherlands aut NATIONALLICENCE 773 0- Adsorption Springer US; http://www.springer-ny.com 13/2(2007-04-01), 105-114 0929-5607 13:2<105 2007 13 10450 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer