Kinetic separation of C4 olefins using Y-fum-fcu-MOF with ultra-fine-tuned aperture size
AuthorsAssen, Ayalew H.
De Moor, Wannes
Denayer, Joeri F.M.
KAUST DepartmentAdvanced Membranes and Porous Materials Research Center
Chemical Science Program
Functional Materials Design, Discovery and Development (FMD3)
Physical Science and Engineering (PSE) Division
Online Publication Date2020-10-18
Print Publication Date2020-10
Embargo End Date2021-10-18
Permanent link to this recordhttp://hdl.handle.net/10754/665829
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AbstractThe separation of C4 olefin mixtures into pure components is one of the most challenging processes in chemical industries. Adsorption-based separation, using ultra-microporous materials, is considered as a viable alternative to reduce the operating cost of the currently employed but energy intensive distillation technique. The understanding of structural properties-relationships for C4 olefins separation using solid state materials is still lacking particularly for microporous materials with purely cage-based structures. Herein, the adsorptive separation of C4 olefins (butene isomers and 1,3-butadiene) by the microporous MOF, Y-fum-fcu-MOF, containing octahedral and tetrahedral cages with triangular pore aperture size (≈4.7 Å), is studied. The adsorption capacities of the MOF for C4 olefins were assessed by measuring the single component adsorption isotherms at 30 °C which led to very similar equilibrium adsorption uptakes at saturation for the components (excluding isobutylene). However, adsorption breakthrough curves collected at 25 °C and Pulse Gas Chromatography experiments, conducted to define the guest–host affinity at very low concentration (Henry's region), evidenced kinetically driven separation of C4 olefins by Y-fum-fcu-MOF. In fact, a strong relation between pores window size, kinetic diameter of the components and their adsorption behavior was observed. The breakthrough capacity decreases at increasing molecular size, allowing the separation of cis- and trans-2-butene despite the quite similar adsorption enthalpies for these components (42.0 and 37.7 kJ/mol, respectively).
CitationAssen, A. H., Virdis, T., De Moor, W., Moussa, A., Eddaoudi, M., Baron, G., … Belmabkhout, Y. (2020). Kinetic separation of C4 olefins using Y-fum-fcu-MOF with ultra-fine-tuned aperture size. Chemical Engineering Journal, 127388. doi:10.1016/j.cej.2020.127388
SponsorsY.B acknowledges the financial support of Mohammed VI Polytechnic University.
JournalChemical Engineering Journal