Abstract
The investigation of surface tension is a very important task for gas hydrate studying. Surfactants can effectively reduce the surface tension, improve the gas storage capability of hydrate and increase the formation rate, shorten the induction time. The objective of this study were to obtain a better understanding of the role of surface tension on hydrate formation and build gas hydrate models involve surfactant. In this study it was highlighted that the surface tension of Intechem-01 + SDS composite surfactants in natural gas hydrate promotion system and the change rules at different temperatures, concentration and proportion. According to the results of experiment, the surface tension of composite surfactants decreased with the increase of Intechem-01. The best cooperating effect was observed in proportion (Intechem-01 content) of 0.6 - 0.7, where the surface tension was the lowest. In this proportion range, the composite surfactants showed the same effect to pure fluorine carbon surfactant. The study shown the surface tension of composite surfactants decreased with the rise of temperature, and they were in a linear relationship within a certain range. Surface tension of composite surfactants decreased with the increase of surfactant concentration, however, it was no longer decreased above critical micelle concentration (CMC). The fitting equation of surface tension with various factors has been obtained.
Highlights
Natural gas hydrate has huge gas storage capacity and the technology of natural gas hydrate storage and transportation offers a new method for energy storage and transportation
Surface tension of composite surfactants decreased with the increase of surfactant concentration, it was no longer decreased above critical micelle concentration (CMC)
1) Surface tension was considered in natural gas hydrate formation dynamic model, which can more accurately analysis and forecast hydrate formation process and calculate change process of phases
Summary
Natural gas hydrate has huge gas storage capacity and the technology of natural gas hydrate storage and transportation offers a new method for energy storage and transportation. Jeffry Yoslim’s experiment [3] studied the effect of SDS on methane-propane gas hydrate and found that molar gas consumption increased 14 times in 242 - 2200 ppm SDS compared with pure water system. H. Ganji [4] found that the hydrate formation rate increased by 35 times in 500 ppm SDS, gas storage ability increased by one time. Multiple chain sulfate surfactant had had better gas storage capacity than SDS even at low concentrations, because of their lower critical micelle concentration (CMC) and special surface tension. Hu Luo et al [6] measured the interfacial tension of ethylene surfactant solution in different temperature and pressure, and studied the influence of pressure for CMC, the results of the study showed that
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