Determination of CO₂ Hydrate Interfacial Tension in the Solution

抄録

The Induction time in CO₂ hydrate crystallization has been measured in a batch system under various experimental conditions. Correlation of the induction time with the solution supersaturation depicted by the Classical Nucleation Theory (CNT) led to determination of the interfacial tension between CO₂ hydrate and water at various temperatures, pressures and solution concentrations. The experimental data have indicated that the induction time decreases with increasing solution concentration at any constant temperature, while the interfacial tension increases with rising temperature. The theory can satisfactorily predict the experimental data. Furthermore, an empirical correlation, based on the famous power law for the rate of nucleation, has been applied and the order of nucleation is thereby obtained. Calculated values for the interfacial tension have been compared with predictions obtained by two conventional models.