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

Veronica Belandria (1) , Amir H. Mohammadi (1) , Ali Eslamimanesh (1) , Dominique Richon (1) , Maria F. Sanchez-Mora (2) , Luis A. Galicia-Luna (2)

1 CEP/Fontainebleau
2 Laboratorio de Termodinamica-Graduados-ESIQIE

Equilibrium pressures for dissociation of the carbon dioxide (CO 2)+nitrogen (N 2)+tetra-n-butylammonium bromide (TBAB)+semi-clathrate (sc) hydrates have been experimentally measured to determine the stability regions and dissociation conditions of mixed CO 2+N 2+TBAB semi-clathrate hydrates. Semi-clathrates have been formed with the addition of TBAB aqueous solutions with mass fractions of (0.05 and 0.30). The relative molar fractions of CO 2 in the feed gas were (0.151, 0.399, and 0.749). Hydrate dissociation conditions have been measured using an isochoric pressure search method in the 275.1-291.0K temperature range and 0.67-19.07MPa pressure range. The obtained experimental clathrate hydrate dissociation data have been compared with the predictions of two thermodynamic models, namely CSMGem and HWHYD, available in open literature. Finally, the thermodynamic promotion effects of TBAB in aqueous solutions are discussed in terms of hydrate dissociation pressures and temperatures and consequently the most favorable operating conditions are proposed.

Mots clés: Carbon dioxide; Experimental data; Hydrate dissociation conditions; Nitrogen; Phase equilibria; Semi-clathrate hydrates; TBAB; Thermodynamic promoter

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

Veronica Belandria, Amir H. Mohammadi, Ali Eslamimanesh, Dominique Richon, Maria F. Sanchez-Mora, et al.. Phase equilibrium measurements for semi-clathrate hydrates of the (CO 2 + N2 + tetra-n-butylammonium bromide) aqueous solution system : Part II. Fluid Phase Equilibria, 2012, 322-323, pp.105-112. ⟨10.1016/j.fluid.2012.02.020⟩. ⟨hal-00797043⟩