Fig. 1. Experimental setup. sure Aég = AP/ Payer. 100% (where AP is the confidence interval, and Payer is the average value of the measured equi- librium pressure at a given temperature) with a probability of 6 = 0.95 was not worse than Aeg = 2% at the beginning of hydrate dissociation (T = 275K) and Aeg = 0.5% at the end of hydrate dissociation (T = 300K). Fig. 2. Hydrate formation (cooling)/dissociation (heating) curves for pure water and water with SDS. Fig. 3. Illustration of hydrate formation and growth in water solution of SDS on side wall of the reactor: (1) capillary suction of the solution and (2) propagation direction of the hydrate crystallization front. Fig. 4. Propagation of the crystallization front of propane hydrate on the reactor wall. Fig. 5. Migration of a single hydrate crystal from the bulk of liquid to the reactor wall. Fig. 6. Consecutive stages of propane hydrate growth in water with SDS: (a) the initial system water with 10-3 wt% SDS-gas propane; (b) onset of hydrate formation and following hydrate growth on the reactor wall and the thermocouple pockets; (c) hydrate growth on the reactor wall and (d) the end of hydrate formation and total conversion of water into hydrate, T= 274K, P =0.4MPa. calculate the amount of liquid that migrated to the reactor wall. Estimates showed that, in the very first instants, the hydrate content in the slurry was about 5-8 wt% (assum- ing that propane hydrate composition was C3Hg.17H20). When all of the liquid was transferred to the reactor wall, the slurry did not contain more than 15 wt% of hydrate. Its adhesion to the reactor wall was weak, and it could be easily removed from the wall. As more water was con- verted into hydrates, the slurry turned snow-white and its adhesion to the reactor wall increased. At the end of the process about 97wt% of water was converted into hydrates. The main stages of water conversion into propane hydrate in the presence of SDS are shown in Fig. 6. Fig. 7. Methane hydrate equilibrium data.
