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CO2 capture by using hydrates: 1) The benefice and the counterpart of thermodynamic additives

Abstract : CO2 capture by using clathrates is a method which benefits from the CO2 selectivity in gas hydrates to separate it from nitrogen, or other exhaust gases from gas or coal combustion. The bottleneck is the operating pressure which still remains high and needs to drop to 0.5 MPa in order to compete with the reference case using amines. As part of two national projects (SECOHYA, ACACIA) and a European program (iCAP), we tested different classes of thermodynamic additives, organic (water insoluble cyclopentane, water soluble THF) which form classical gas hydrates with structure SII, and ionic (Tetra-NButyl Ammonium Bromide, TBAB) which forms new types of structures. In this presentation, we show experimental results that clearly demonstrate that the operating pressure can be reduced to atmospheric pressure, and we emphasize that the CO2 selectivity is enhanced, with cyclopentane as an additive, but also especially by using TBAB where the selectivity can be boosted up to 100%. We also show that the experimental conditions of pressure and temperature need to be selected outside the region of formation of the single additive hydrate. If not, the gas storage capacity drops to a negligible value. We conclude the presentation by showing the physical impossibility to find a thermodynamic additive to drop the operative pressure without dropping the storage capacity.
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Submitted on : Monday, September 29, 2014 - 9:44:58 AM
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  • HAL Id : hal-01068432, version 1

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Aurélie Galfré, Pedro Brantuas, Ana Cameirão, Yamina Ouabbas, Baptiste Bouillot, et al.. CO2 capture by using hydrates: 1) The benefice and the counterpart of thermodynamic additives. The 8th International Conference on Gas Hydrates, Jul 2014, Pékin, China. pp.T1-73. ⟨hal-01068432⟩

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