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Abstract
Abstract: Methane and ethane are each known to form structure I (sI) hydrates. However, Raman and NMR measurements made on hydrates formed from gas mixtures of methane (CH4) and ethane (C2H6) indicate that structure II (sII) forms in this system for certain gas compositions. Raman band frequencies for ethane obtained from different CH4+ C2H6 hydrates at 274.2 K indicate a change in hydrate structure from sI to sII between 72.2 and 75 mole% of CH4 in the vapor. A significant increase in the amount of methane incorporated into the hydrate is observed with change in hydrate structure from sI to sII. Solid‐state 13C CPMAS NMR measurements at 253 K confirm that CH4+ C2H6 gas mixtures can form sII hydrates at certain feed compositions.
Published Version
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