CO2 capture by using hydrates: 2 Modeling the gas storage capacity of TBAB semi-clathrate hydratesReport as inadecuate

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* Corresponding author 1 SPIN-ENSMSE - Centre Sciences des Processus Industriels et Naturels 2 PROPICE-ENSMSE - Département PROcédés Poudres, Interfaces, Cristallisation et Ecoulements 3 LGF-ENSMSE - UMR 5307 - Laboratoire Georges Friedel 4 AIST - National Institute of Advanced Industrial Science and Technology 5 Department of Mechanical Engineering

Abstract : The CO2 capture by using clathrates is a method which takes profit of the CO2 selectivity in gas hydrate to separate it from nitrogen, or other exhausting gases from gas combustion or coal combustion. The bottleneck is the operative pressure which still remains high and needs to be drop down to 0.5 MPa in order to compete with the reference case using Amines. After two national projects SECOHYA, ACACIA and a european program iCAP, we tested different classes of thermodynamic additives, organic ones water un soluble Cyclopentane, water soluble THF which form classical gas hydrates with structure SII, and ionic ones Tetra-N-Butyl Ammonium Bromide, TBAB which forms new types of structures. In this presentation, we present the modeling of the gas storage capacity of the TBAB semi clathrate hydrates. We propose a set of new equilibrium data about the CO2-N2-TBAB Hydrate-Liquid-Vapor equilibrium. We complete it with the literature data. These experimental results are modeled elsewhere. We present a simplification of the model to simulate the hydrate volume storage and the operative pressure versus the operative temperature. The conclusion of this work emphasizes that the operative can be drop to the atmospheric pressure, but the counterpart is the gas storage capacity which becomes null.

Keywords : gas separation thermodynamic additives clathrates and semi clathrates hydrates

Author: Matthias Kwaterski - Jean-Michel Herri - Aurélie Galfré - Pedro Brantuas - Ana Cameirão - Yamina Ouabbas - Baptiste Bouillot -



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