Journal
CHEMICAL ENGINEERING JOURNAL
Volume 167, Issue 1, Pages 1-12Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2010.07.041
Keywords
Adsorption; Separation; Olefin/paraffin; Metal-organic frameworks; VPSA; SMB; Cu-BTC
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Funding
- Fundacao para a Ciencia e a Tecnologia (FCT, Portugal) [REEQ/1062/CTM/2005, REDE/1512/RME/2005]
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In this work, we investigate the potential of a MOF porous material, Cu-BTC in combination with cyclic adsorption processes (vacuum swing adsorption, VSA, and simulated moving bed, SMB) for the separation of propylene/propane mixture. A gravimetric method has been used to measure the adsorption isotherms of propylene, propane and isobutane onto Cu-BTC extrudates over a temperature range from 323 to 373 K and pressures up to 500 kPa. These were complemented by experimental characterization of the Cu-BTC material using XRD and SEM-EDS techniques. Whereas the separation and its kinetics were studied by breakthrough experiments on a column packed with the Cu-BTC material in the extruded form at 373 K. The Cu-BTC extrudates are selective towards propylene, highlighting the potential of this material for the separation of propane and propylene mixtures by PSA process. Furthermore, in a range of temperatures and pressures, the affinity of Cu-BTC for isobutane was observed to be intermediate to that of propane and propylene which suggest that isobutane is a promising desorbent in SMB processes for propane/propylene separations. (C) 2010 Elsevier B.V. All rights reserved.
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