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

Amir H. Mohammadi (1, 2) , Ali Eslamimanesh (1) , Dominique Richon (2, 3)

1 CTP - Centre Thermodynamique des Procédés
2 Thermodynamics Research Unit
3 Department of biotechnology and chemical technology

In this communication, clathrate/semi-clathrate hydrate dissociation conditions for the systems containing mixtures of CO2 (0.1481/0.3952/0.7501 mol fraction)+H2 (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.

Mots clés: Semi-clathrate hydrate; Gas hydrate; TBAB; Carbon dioxide; Hydrogen; Methane

Domaines: Génie des procédés

Amir H. Mohammadi, Ali Eslamimanesh, Dominique Richon. Semi-clathrate hydrate phase equilibrium measurements for the CO2+H2/CH4+tetra-n-butylammonium bromide aqueous solution system. Chemical Engineering Science, 2013, 94, pp.284-290. ⟨10.1016/j.ces.2013.01.063⟩. ⟨hal-00876958⟩