이온성 액체를 이용한 메탄 하이드레이트 생성 촉진효과 연구

초록

In this study, we investigated the kinetics of gas hydrate formation in the presence of ionic liquid (IL). Hydroxyethyl-methyl-morpholinium chloride (HEMM-Cl) was chosen as a material for the promotion effect test. Phase equilibrium curve for CH4 hydrate with aqueous IL solution was obtained and its induction time and consumed amount of CH4 gas were also measured. Aqueous solutions containing 20~20,000 ppm of HEMM-Cl was prepared and studied at 70 bar and 274.15 K. To compare the measured results to those of the conventional promoter, sodium dodecyl sulfate was also tested at the same condition. Result showed that the hydrate equilibrium curve was shifted toward higher pressure and lower temperature region. In addition, the induction time on CH4 hydrate formation in the presence of IL was not shown. The amount of consumed CH4 was increased with the whole range of tested concentration of IL and the highest consumption of CH4 happened at 1,000 ppm of HEMM-Cl. HEMM-Cl induced and enhanced the CH4 hydrate formation with a small amount of addition. Obtained result is expected to be applied for the development of technologies such as gas storage and transport using gas hydrates.

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