276516 Single Column VSA Studies for CO2 Recovery Using Metal Organic Frame Work Adsorbent: Comparison with Commercial Zeolite
Single Column VSA Studies for CO2 Recovery using Metal Organic Frame Work Adsorbent: Comparison with Commercial Zeolite
Aarti Arya, Soumen Dasgupta, Swapnil Divekar, Anshu Nanoti*, Amar N. Goswami and Madhukar O. Garg
Indian Institute of Petroleum, Dehradun-248005, India.
Anne Andersen, Jasmina Hafizovic Cavka & Richard Blom
SINTEF Materials & Chemistry, P.O.Box 124 Blindern, 0314 Oslo, Norway
Rising levels of CO2 in the atmosphere due to burning of fossil fuel have been recognized to be the main contributor of global warming and associated climate change phenomenon. Fossil fuel combustion for power generation is the major source of increased CO2 levels in the atmosphere, but capturing CO2 from flue gas emissions in power plants where it is available as a low pressure stream, presents a formidable challenge. Current technologies available such as amine based absorption processes are considered uneconomic and there is a concerted effort being made to improve such processes or develop more efficient alternative processes. In this context adsorption processes using Pressure or Vacuum Swing Adsorption (PSA/VSA) are attracting interest as energy requirements are lower .
Solid adsorbents like zeolites and activated carbons can be used to recover CO2 from flue gas mixtures by pressure swing adsorption technique.Several adsorbent materials have been investigated for CO2 recovery by PSA/VSA. The general consensus appears to be that Zeolite 13X materials performs better than activated carbons or silica gels . Both capacities and selectivities for separation of CO2/N2 mixtures (representative of flue gases from power plants) are superior. However, as CO2 isotherms on zeolites are nonlinear, power requirement during regeneration can be high and there is for this reason a large scope for developing new adsorbents which will show better selectivity and regenerability.
Metal Organic Frameworks (MOF) is a new class of adsorbents attracting interest for selective CO2 separation . These are materials in which metal ions or clusters are connected via organic linkers to form highly porous network structures. Several MOF's have been proposed as adsorbents for CO2 recovery. These include MOF-47 [Vanadium (IV) benzene 1,4 dicarboxylate ], MIL-53 [Chromium (III) benzene 1,4 dicarboxylate] and CuBTC [ Copper(II) benzene 1,3,5 tri carboxylate]. However, the several studies that have been reported so far on CO2 adsorption on MOF's have been limited mostly to equilibrium isotherm and diffusion measurements with pure components [6,7,8,9]. The present paper reports an experimental study on the separation of CO2 from mixtures with nitrogen using UIO-66 (Zr6O4(OH)4(1,4-dicarboxybenzene))MOF adsorbent , in a vacuum swing adsorber operating with a heavy reflux or rinse cycle typically used for recovery of the strong adsorptive (in this case, CO2) from gas mixtures. UIO-66 is an in-house synthesised MOF that can be formulated easily in suitable forms for column operation. The results are compared with performance data generated with commercialZeolite 13X under comparable operating conditions. The study shows that UIO-66 performs satisfactorily in long term column operation and there was no performance deterioration noted. CO2 recoveries are higher than observed with the zeolite while CO2 purities are lower.
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