Thermodynamic stability conditions for semi-clathrate hydrates of CO2, CH4, or N2 with tetrabutyl ammonium nitrate (TBANO3) aqueous solution

• Hydrate phase equilibria for CO2/CH4/N2 + TBANO3 aqueous solution are measured.
• The isochoric pressure search method was used to perform the measurements.
• The promotion and inhibition effects of TBANO3 are investigated.
• Range of the equilibrium temperature is from (275.1 to 285.1) K.

In this communication, the effect of tetrabutyl ammonium nitrate (TBANO3) on CO2, CH4, or N2 hydrate was studied. Hydrate dissociation conditions for CO2 + TBANO3 + water, CH4 + TBANO3 + water and N2 + TBANO3 + water were investigated at different concentrations of TBANO3, viz. (0.05, 0.10, and 0.15) mass fraction, and over a temperature and pressure range of T = (275.1 to 285.1) K and (1.21 to 7.27) MPa, respectively. The results show that the presence of TBANO3 causes the phase equilibrium curve to be shifted to moderate conditions (lower pressure and higher temperature), especially at higher concentrations of TBANO3.

Figure optionsDownload as PowerPoint slide