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Influence of Large Molecular Guest Species on the Formation of CH 4 and CO 2 Hydrates

23 Pages Posted: 9 Oct 2020 Publication Status: Review Complete

See all articles by Asheesh Kumar

Asheesh Kumar

National University of Singapore (NUS) - Department of Chemical and Biomolecular Engineering

Nagu Daraboina

University of Tulsa - Russell School of Chemical Engineering

Praveen Linga

National University of Singapore (NUS) - Department of Chemical and Biomolecular Engineering

Rajnish Kumar

Indian Institute of Technology (IIT), Madras - Department of Chemical Engineering

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Abstract

Methane hydrates in nature are considered as a future energy resource for natural gas due to their abundance in nature. The presence of all three structures of clathrate hydrates in the nature have been reported. Structural transition in clathrate hydrates in particular with regards to sH hydrates and the influence of large guest molecules is still not well understood. In the current work, we synthesize mixed hydrate of CO2 & CH4 mixture in presence of sH formers, neo-hexane (NH) and tert-butylmethylether (TBME). High-pressure in-situ differential scanning calorimetry was employed to investigate the phase transformation between soild-liquid-gas. We confirmed that CO2 lean mixture (24% CO2 & 76% CH4) forms structure H (sH) hydrate, while CO2 rich mixture (76% CO2 & 24% CH4) forms structure I (sI) hydrate. This study presents new insights to understand the dynamic preference of methane and carbon dioxide in three different types of cages in sH hydrate.

Keywords: Gas hydrates, high-pressure calorimeter, sH formers, Neohexane, methane hydrates

Suggested Citation

Kumar, Asheesh and Daraboina, Nagu and Linga, Praveen and Kumar, Rajnish, Influence of Large Molecular Guest Species on the Formation of CH 4 and CO 2 Hydrates. Available at SSRN: https://ssrn.com/abstract=3691244 or http://dx.doi.org/10.2139/ssrn.3691244
This version of the paper has not been formally peer reviewed.

Asheesh Kumar

National University of Singapore (NUS) - Department of Chemical and Biomolecular Engineering

Singapore

Nagu Daraboina

University of Tulsa - Russell School of Chemical Engineering ( email )

600 South College
Tulsa, OK 74104
United States

Praveen Linga (Contact Author)

National University of Singapore (NUS) - Department of Chemical and Biomolecular Engineering ( email )

Singapore

Rajnish Kumar

Indian Institute of Technology (IIT), Madras - Department of Chemical Engineering ( email )

India

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