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Complex Phase Behaviors and Structural Coexistence of Natural Gas Hydrates Containing Large-Molecule Guest Substances by Joonseop Lee; Gyeol Ko; Junghoon Mok; Yongwon Seo is a Engineering article available to read on EtoBox.

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The complex phase behaviors and structural coexistence of natural gas hydrates (NGHs) that contain large-molecule guest substances (LMGSs) were examined for their significance in the exploration and exploitation of NGHs as well as natural gas storage and transportation. Methylcyclopentane (MCP) and 2,2dimethylbutane [neohexane (NH)] were chosen as LMGSs, and the simplest composition of NGHs and natural gas was simulated by a gas mixture of CH 4 (90%) + C 2 H 6 (10%). The coexistence of structure II (sII) and structure H (sH) hydrates in the CH 4 + C 2 H 6 + LMGS + water mixtures was revealed by 13 C nuclear magnetic resonance (NMR) and powder X-ray diffraction (PXRD). CH 4 and LMGSs were captured in sH, whereas CH 4 and C 2 H 6 were enclathrated in sII. Endothermic heat flow curves, which were obtained by a differential scanning calorimeter (DSC), and pressure (P)-temperature (T) traces exhibited two-step dissociation of formed gas hydrates (sH dissociation followed by sII dissociation). The experimental results for the PXRD patterns, 13 C NMR spectra, phase equilibria, DSC heating curves, and P-T traces clearly demonstrated that the CH 4 (90%) + C 2 H 6 (10%) + LMGS + water mixtur

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Author

Joonseop Lee; Gyeol Ko; Junghoon Mok; Yongwon Seo

Publisher

American Chemical Society (ACS)

Published

2021

Language

EN

Field

Engineering (Physical Sciences)