Integration of MFI Zeolite Membranes in the Light Gasoline Isomerisation Process

Baudot, Arnaud; Bournay, Laurent

doi:10.2516/ogst/2009073

Cited by 9 publications

(4 citation statements)

References 12 publications

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“…However, if applied at the exit of the hydroisomerization unit, the ideal target is the separation of linear and monobranched hydrocarbons from multibranched ones, as it would increase the efficiency of the whole process by recycling both low-octane linear and monobranched hydrocarbons to the head of the unit and yield a multibranched product-enriched raffinate with a high ON. Several materials have been studied and patented for this purpose, out of which silicalite-1 (Si-MFI) and other materials with MFI structure have been most frequently considered. ,− Other zeolites with diverse structures, such as AFI, AEL, ATO, BEA, FAU, FER, , ATS, CFI, , EUO, MWW, NES, ,,, MEL, MRE, and MTT, have been patented for this separation as well, but none of them clearly surpasses Si-MFI . Recently, pure silica zeolites Si-STW and EMM-17 and MOF Fe 2 (BDP) 3 (BDP 2– = 1,4-benzenedipyrazolate), have been proposed as promising adsorbents for this separation.…”

Section: Chemical Separations By Zeolitesmentioning

confidence: 99%

Zeolites in Adsorption Processes: State of the Art and Future Prospects

2022

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Zeolites have been widely used as catalysts, ion exchangers, and adsorbents since their industrial breakthrough in the 1950s and continue to be state-of the-art adsorbents in many separation processes. Furthermore, their properties make them materials of choice for developing and emerging separation applications. The aim of this review is to put into context the relevance of zeolites and their use and prospects in adsorption technology. It has been divided into three different sections, i.e., zeolites, adsorption on nanoporous materials, and chemical separations by zeolites. In the first section, zeolites are explained in terms of their structure, composition, preparation, and properties, and a brief review of their applications is given. In the second section, the fundamentals of adsorption science are presented, with special attention to its industrial application and our case of interest, which is adsorption on zeolites. Finally, the state-of-the-art relevant separations related to chemical and energy production, in which zeolites have a practical or potential applicability, are presented. The replacement of some of the current separation methods by optimized adsorption processes using zeolites could mean an improvement in terms of sustainability and energy savings. Different separation mechanisms and the underlying adsorption properties that make zeolites interesting for these applications are discussed.

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Section: Chemical Separations By Zeolitesmentioning

confidence: 99%

Zeolites in Adsorption Processes: State of the Art and Future Prospects

2022

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“…The improved separation factor validates that the membrane is in good quality such as high continuity. To assess the practical application of this membrane, the separation test was carried out on a multicomponent mixture in volume composition of 13:20:18:19:30 for nHEX:2MP:3MP:23DMB:22DMB [44]. The permeance and separation factor were recorded as a function of time (Fig.…”

Section: Science China Materialsmentioning

confidence: 99%

Surface-gel-conversion synthesis of submicron-thick MFI zeolite membranes to expedite shape-selective separation of hexane isomers

et al. 2020

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Ultrathin zeolite membranes are of paramount importance in accelerating gas transport during membrane separation, and lowering down their membrane thicknesses to submicron scale is deemed to be very challenging. Herein, we develop an advanced approach of surface gel conversion for synthesis of submicron-thick pure silica MFI (silicalite-1) zeolite membranes. Viscous gel is prepared by finely adjusting the precursor composition, enabling its reduced wettability. The unfavorable wetting of the support surface can effectively prevent gel penetration into alumina support voids. Aided by the seeds, the surface gel is directly and fully crystallized into an MFI zeolite membrane with minimal water steam. A membrane with a thickness of 500 nm is successfully acquired and it is free of visible cracks. Additionally, the as-synthesized membranes exhibit rapid and selective separation of hexane isomers by virtue of unprecedentedly high n-hexane permeance of 24.5×10 −7 mol m −2 s −1 Pa −1 and impressive separation factors of 13.3-22.6 for n-hexane over its isomers. This developed approach is of practical interest for sustainable synthesis of high-quality zeolite membranes.

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“…On the other hand, this separation is also more complicated technically. Silicalite-1 (Si-MFI) and other MFI-structured materials and membranes have been the most frequently studied and patented materials for this separation. − Other materials with MWW, EUO, NES, ,− AFI, BEA, FER, FAU, ATO, AEL, , MEL, MTT, MRE, ATS, and CFI structures , can as well be found in the patent literature for this purpose, but none of them are clearly superior to Si-MFI …”

Section: Introductionmentioning

confidence: 99%

Insights into Adsorption of Linear, Monobranched, and Dibranched Alkanes on Pure Silica STW Zeolite as a Promising Material for Their Separation

et al. 2020

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The adsorption of linear, monobranched and dibranched saturated hydrocarbons in the gasoline range has been studied on pure silica STW zeolite (Si-STW) by using pentane, hexane, and heptane isomers as model adsorbates. Experimental single-component adsorption isotherms and kinetic measurements together with configurational bias Monte Carlo (CBMC) and molecular dynamics (MD) simulations were carried out. Significant differences in both the equilibrium adsorption and especially the adsorption kinetics were found, which suggests that the separation of the quaternary-carbon dibranched isomer is feasible. The adsorption capacities and selectivities surpass those of pure silica MFI (Si-MFI), considered as reference. Altogether, Si-STW is presented as a promising adsorbent for increasing the octane number (ON) of the hydroisomerization product by selectively excluding quaternary-carbon dibranched hydrocarbons.

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Integration of MFI Zeolite Membranes in the Light Gasoline Isomerisation Process

Cited by 9 publications

References 12 publications

Zeolites in Adsorption Processes: State of the Art and Future Prospects

Zeolites in Adsorption Processes: State of the Art and Future Prospects

Surface-gel-conversion synthesis of submicron-thick MFI zeolite membranes to expedite shape-selective separation of hexane isomers

Insights into Adsorption of Linear, Monobranched, and Dibranched Alkanes on Pure Silica STW Zeolite as a Promising Material for Their Separation

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