Silicalite-1 Membrane: Synthesis, Modification, Characterization And Its Performance For The Reactive Separation Of Para-Xylene From Xylene Isomers

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dc.contributor.authorYeong, Yin Fong
dc.date.accessioned2018-06-08T08:14:26Z
dc.date.available2018-06-08T08:14:26Z
dc.date.issued2010-05
dc.description.abstractReactive separation of para-xylene from xylene isomers in a catalytic membrane reactor depends on the right choice of catalytic membrane. This membrane should not only catalyze xylene isomerization reaction but also separate para-xylene (p-xylene) from its isomers (ortho-xylene (o-xylene) and meta-xylene (m-xylene)). In the present study, silicalite-1 and two types of acid-functionalized silicalite-1 membranes: (1) propylsulfonic acid-functionalized silicalite-1 membrane and (2) arenesulfonic acid-functionalized silicalite-1 membrane were synthesized on disc type -alumina support, pre-coated with mesoporous silica layer. The physical and chemical properties of the membranes were characterized using different techniques such as XRD, SEM, TEM, 29Si MAS NMR, 13C CP-MAS NMR, FTIR, TGA, EA, NH3-TPD, acid-base titration and nitrogen adsorption–desorption. The nitrogen permeation and permporosimetry tests were conducted to evaluate the quality and the presence of non-zeolite pores in the membranes. Design of experiments (DoE) was applied in the optimization process of p-xylene separation from p-/o-xylene binary mixture and p-/o-/m-xylene ternary xylene mixture using silicalite-1 membrane. The optimum p-xylene flux of 3.83 x 10-6 mol/m2.s and p-/o-xylene separation factor of 46 were obtained at a temperature of 198 oC, p-xylene feed partial pressure of 0.15 kPa and p-xylene feed composition of 0.80. The optimum p-xylene flux of 5.94 x 10-6 mol/m2.s, p-/o-xylene separation factor of 19 and p-/m-xylene separation factor of 20 were achieve at temperature of 198 oC and p-xylene feed partial pressure of 0.22 kPa in ternary xylene mixture separation. The Maxwell-Stefan diffusion model, in combination with the Ideal Adsorbed Solution (IAS) theory and single-component adsorption parameter were used to predict the permeation flux of p-xylene and o-xylene for binary xylene mixture through a silicalite-1 membrane in the temperature range of 150 oC – 250 oC.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/5719
dc.language.isoenen_US
dc.publisherUniversiti Sains Malaysiaen_US
dc.subjectPara-xylene from xylene isomers in a catalytic membrane reactoren_US
dc.subjectdepends on the right choice of catalytic membraneen_US
dc.titleSilicalite-1 Membrane: Synthesis, Modification, Characterization And Its Performance For The Reactive Separation Of Para-Xylene From Xylene Isomersen_US
dc.typeThesisen_US
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