Semi-clathrate hydrate phase equilibrium measurements for the CO2+H2/CH4+tetra-n-butylammonium bromide aqueous solution system

In this communication, clathrate/semi-clathrate hydrate dissociation conditions for the systems containing mixtures of CO2 (0.1481/0.3952/0.7501 mol fraction)+H-2 (0.8519/0.6048/0.2499 mol fraction) in the presence of water or 0.05 and 0.30 mass fractions tetra-n-butylammonium bromide (TBAB) aqueous solutions and CO2 (0.4029 mol fraction)+CH4 (0.5971 mol fraction) in the presence of water, 0.05 and 0.3 mass fractions TBAB have been measured and are reported. An apparatus comprising a high pressure equilibrium cell as the main part has been employed for the measurements following the isochoric pressure-search method. The range of conditions for the measurements are 275.5-292.8 K up to 15.91 MPa. Significant decrease in operating pressure of gas hydrate formation for separation of CO2 from the corresponding gas mixtures is observed due to the promotion effects of TBAB. (c) 2013 Elsevier Ltd. All rights reserved.