Abstract
In this study, experimental hydrate dissociation data for krypton in the presence of aqueous solutions of TBAB at varying concentrations of 0, 0.05, 0.10 and 0.20mass fraction TBAB were measured. The measurements were undertaken in the temperature range of (274.1 to 297.1) K and pressures ranging from (0.22 to 11.97) MPa. In addition, semi-clathrate hydrate dissociation data for the TBAB+water system at a pressure of 99.8kPa and at various TBAB concentrations of 0.05, 0.10, 0.20 and 0.30mass fractions were measured. The isochoric pressure-search method was used to undertake the measurements. The purpose of this study was to investigate the effect of TBAB aqueous solution on krypton hydrates. The results reveal that the TBAB aqueous solutions with concentrations of 0.05, 0.10 and 0.20mass fractions show a drastic promotion effect on the krypton hydrate causing a shift of the P-T equilibrium line to lower pressures and higher temperatures. In addition, increasing the TBAB concentration increases its promotion effect. The hydrate dissociation conditions for krypton+water+TBAB system were represented using a model based on the work of Chen and Guo, (Chem. Eng. J. 71 (1998) 145–151) and Joshi et al. (J. Nat. Gas Chem. 21 (2012) 459–465). The model results show a satisfactory agreement with the experimental data, with an absolute relative deviation (ARD%) below 0.3%.
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