Hydrate-based energy storage: Studying mixed CH4/1,3-dioxane hydrates via thermodynamic modeling, in-situ Raman spectroscopy, and macroscopic kinetics

Jiyue Sun, Ye Zhang, Gaurav Bhattacharjee, Xiaosen Li, Lei Jiang and Praveen Linga

Applied Energy, 2024, vol. 368, issue C, No S0306261924009000

Abstract: It can be foreseen that the global demand for natural gas (NG) will show an increase trend in the upcoming decades. Solidified Natural Gas (SNG) having a high energy density provides an alternative solution for the storage and transportation of NG. In this study, our focus lies on investigating the impact of 1,3-dioxane and L-tryptophan on mixed CH4/dioxane hydrate formation from multiple perspectives including thermodynamic, Raman spectra, and kinetics. The thermodynamic experimental results confirmed that the mixed CH4/dioxane hydrate can form at a moderate conditions and shows high dissociation enthalpies. A thermodynamic model based on van der Waals and Platteeuw model was applied for predicting equilibrium conditions of the Hydrate–Liquid–Vapor system, yielding an average absolute deviation ranging from 1.7% to 3.9%. Raman spectra results revealed that there is a two–stage growth mechanism for mixed CH4/dioxane hydrates. Kinetic results demonstrated that the system of CH4/5.56 mol% dioxane/water shows the highest gas uptake of 91.1 (±0.5) v/v at 287.15 K and 10.0 MPa, compared to other systems. Moreover, the addition of 1000 ppm L-tryptophan can reduce the time to reach 90% uptake (t90), showing a value of 19.9 (±1.8) minutes. The findings derived from this research are instrumental in developing the SNG technology.

Keywords: Methane storage; Phase equilibrium; Kinetics; Raman spectra; L-tryptophan; Thermodynamic modeling (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1016/j.apenergy.2024.123517

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