The Driving Forces of Guest Substitution in Gas Hydrates—A Laser Raman Study on CH 4 -CO 2 Exchange in the Presence of Impurities

Bettina Beeskow-Strauch and Judith Maria Schicks
Additional contact information
Bettina Beeskow-Strauch: Helmholtz Centre Potsdam, German Research Centre for Geosciences (GFZ), Telegrafenberg, 14473 Potsdam, Germany
Judith Maria Schicks: Helmholtz Centre Potsdam, German Research Centre for Geosciences (GFZ), Telegrafenberg, 14473 Potsdam, Germany

Energies, 2012, vol. 5, issue 2, 1-18

Abstract: The recovery of CH 4 gas from natural hydrate formations by injection of industrially emitted CO 2 is considered to be a promising solution to simultaneously access an unconventional fossil fuel reserve and counteract atmospheric CO 2 increase. CO 2 obtained from industrial processes may contain traces of impurities such as SO 2 or NO x and natural gas hydrates may contain higher hydrocarbons such as C 2 H 6 and C 3 H 8 . These additions have an influence on the properties of the resulting hydrate phase and the conversion process of CH 4 -rich hydrates to CO 2 -rich hydrates. Here we show results of a microscopic and laser Raman in situ study investigating the effects of SO 2 -polluted CO 2 and mixed CH 4 -C 2 H 6 hydrate on the exchange process. Our study shows that the key driving force of the exchange processes is the establishment of the chemical equilibrium between hydrate phase and the surrounding phases. The exchange rate is also influenced by the guest-to-cavity ratio as well as the thermodynamic stability in terms of p - T conditions of the original and resulting hydrate phase. The most effective molecule exchange is related to structural changes (sI-sII) which indicates that hydrate decomposition and reformation processes are the occurring processes.

Keywords: gas hydrate; CH 4 -CO 2 exchange; SO 2; C 2 H 6; chemical equilibrium; sI-sII conversion (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: 2012
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

Downloads: (external link)
https://www.mdpi.com/1996-1073/5/2/420/pdf (application/pdf)
https://www.mdpi.com/1996-1073/5/2/420/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:5:y:2012:i:2:p:420-437:d:16265

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().