Analysis of the Dissolution of CH 4 /CO 2 -Mixtures into Liquid Water and the Subsequent Hydrate Formation via In Situ Raman Spectroscopy

Zheng Li, Christine C. Holzammer and Andreas S. Braeuer
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Zheng Li: Institute of Thermal-, Environmental-, and Resources’ Process Engineering (ITUN), Technische Universität Bergakademie Freiberg (TUBAF), 09599 Freiberg, Germany
Christine C. Holzammer: Institute of Thermal-, Environmental-, and Resources’ Process Engineering (ITUN), Technische Universität Bergakademie Freiberg (TUBAF), 09599 Freiberg, Germany
Andreas S. Braeuer: Institute of Thermal-, Environmental-, and Resources’ Process Engineering (ITUN), Technische Universität Bergakademie Freiberg (TUBAF), 09599 Freiberg, Germany

Energies, 2020, vol. 13, issue 4, 1-17

Abstract: We report an experimental study for the investigation into the suitability of hydrate formation processes for the purification of methane (CH 4 ) from carbon dioxide (CO 2 ) at a sub-cooling temperature of 6 K and a pressure of 4 MPa. The experiments were conducted in a stirred batch reactor. Three different initial CH 4 /CO 2 mixtures with methane fractions of 70.1 mol%, 50.3 mol%, and 28.5 mol% were tested. The separation efficiency was quantified by measuring in situ via Raman spectroscopy the ratios of CH 4 /CO 2 in the gas mixture, the liquid water-rich phase before hydrate formation, and the solid hydrate phase after the onset of the hydrate formation. The results indicated that the main separation effect is obtained due to the preferential dissolution of CO 2 into the liquid water-rich phase before the onset of the hydrate formation.

Keywords: gas hydrates; in situ Raman spectroscopy; molar ratio; carbon dioxide; methane (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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