Methane storage in water frameworks: Self-preservation of methane hydrate pellets formed from NaCl solutions

Satoshi Takeya, Hiroko Mimachi and Tetsuro Murayama

Applied Energy, 2018, vol. 230, issue C, 86-93

Abstract: The use of methane (CH4) hydrate as a CH4 or natural gas storage medium offers an efficient and green source of energy. In this study, we produced CH4 hydrate pellets containing NaCl at up to 2.7 wt%, and storage tests were performed to investigate the stability of CH4 hydrates with NaCl at 253 or 248 K under ambient pressure. Based on assessing mass variations and powder X-ray diffraction analyses, it was determined that the dissociation rate of the hydrate greatly depends on the storage temperature. Below the eutectic point of the water-NaCl system, the hydrate exhibited self-preservation, while specimens readily dissociated at 253 K. The experimental results obtained in this study elucidate the effects of the NaCl solution on the self-preservation of CH4 hydrates, and allow a kinetic model for this self-preservation phenomenon to be proposed. The results indicate that CH4 hydrate pellets formed from sea water are a viable CH4 storage and transportation media below the eutectic temperature.

Keywords: Aqueous solution; Clathrate; Dissociation; Gas hydrate; Gas storage; Sea water (search for similar items in EconPapers)
Date: 2018
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Citations: View citations in EconPapers (5)

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DOI: 10.1016/j.apenergy.2018.08.015

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