Phase equilibrium measurements for semi-clathrate hydrates of the (CO 2 + N2 + tetra-n-butylammonium bromide) aqueous solution system

Amir H. Mohammadi (1) , Ali Eslamimanesh (1) , Veronica Belandria (1) , Dominique Richon (1) , Paramespri Naidoo (2) , Deresh Ramjugernath (2)

1 CEP/Fontainebleau
2 Thermodynamics Research Unit

The application of semi-clathrate hydrate formation technology for gas separation purposes has gained much attention in recent years. Consequently, there is a demand for experimental data for relevant semi-clathrate hydrate phase equilibria. In this work, semi-clathrate hydrate dissociation conditions for the system comprising mixtures of {CO2 (0.151/0.399 mole fraction) + N2 (0.849/0.601 mole fraction) + 0.05, 0.15, and 0.30 mass fraction tetra-n-butylammonium bromide (TBAB)} aqueous solutions have been measured and are reported. An experimental apparatus which was designed and built in-house was used for the measurements using the isochoric pressure-search method. The range of conditions for the measurements was from 277.1 K to 293.2 K for temperature and pressures up to 16.21 MPa. The phase equilibrium data measured demonstrate the high hydrate promotion effects of TBAB aqueous solutions.

Mots clés: Gas hydrate; Semi-clathrate; TBAB; Carbon dioxide; Nitrogen; Experimental data; Separation

Domaines: Sciences de l'ingénieur [physics]; Génie des procédés

Amir H. Mohammadi, Ali Eslamimanesh, Veronica Belandria, Dominique Richon, Paramespri Naidoo, et al.. Phase equilibrium measurements for semi-clathrate hydrates of the (CO 2 + N2 + tetra-n-butylammonium bromide) aqueous solution system. Journal of Chemical Thermodynamics, 2012, 46, pp.57-61. ⟨10.1016/j.jct.2011.10.004⟩. ⟨hal-00658462⟩