Microscopic Molecular Insights into Clathrate Methane Hydrates Dissociation in a Flowing System

2021 ◽  
pp. 133098
Author(s):  
Bo Liao ◽  
Jintang Wang ◽  
Xinpeng Han ◽  
Ren Wang ◽  
Kaihe Lv ◽  
...  
Keyword(s):  
Methane Hydrates ◽  
Flowing System

Methane Hydrates in Quaternary Climate Change: The Clathrate Gun Hypothesis

10.1029/054sp ◽  
2003 ◽  
Author(s):  
James P. Kennett ◽  
Kevin G. Cannariato ◽  
Ingrid L. Hendy ◽  
Richard J. Behl
Keyword(s):  
Climate Change ◽  
Methane Hydrates ◽  
Quaternary Climate

Methane Hydrates DTAGS and Coring Cruise Off the Carolina Coast

2003 ◽  
Author(s):  
Warren T. Wood ◽  
Kenneth Grabowski ◽  
Richard B. Coffin ◽  
Dennis A. Lindwall ◽  
Stephen Theophanis
Keyword(s):  
Methane Hydrates

Governing the transboundary risks of offshore methane hydrate exploration in the seabed and ocean floor—an analysis on international provisions and Chinese law†

2020 ◽  
Vol 13 (2) ◽  
pp. 185-203
Author(s):  
Dong Yan ◽  
Paolo Davide Farah ◽  
Tivadar Ötvös ◽  
Ivana Gaskova
Keyword(s):  
Methane Hydrate ◽  
Human Life ◽  
Damage Control ◽  
Legal Framework ◽  
Environmental Harm ◽  
Methane Hydrates ◽  
International Role ◽  
Deep Seabed Mining ◽  
The Cost ◽  
The Unclos

Abstract Considering the fact that its existence is abundant while maintaining the ability to generate freshwater while burning, methane hydrates have been classified as sources of sustainable energy. China currently maintains an international role in developing technology meant to explore offshore methane hydrates buried under the mud of the seabed, their primary laboratory being the South China Sea. However, such a process does not come without its hazards and fatal consequences, ranging from the destruction of the flora and fauna, the general environment, and—the greatest hazard of all—the cost of human life. The United Nations Convention on the Law of the Sea (hereinafter ‘UNCLOS’), being an important international legal regime and instrument, has assigned damage control during the exploration of methane hydrates, as being the responsibilities and liability of individual sovereign states and corporations. China adopted the Deep Seabed Mining Law (hereinafter the DSM Law) on 26 February 2016, which came into force on the 1 of May 2016; a regulation providing the legal framework also for the Chinese government’s role in methane hydrate exploratory activities. This article examines the role of the DSM Law and its provisions, as well as several international documents intended to prevent transboundary environmental harm from arising, as a result of offshore methane hydrate extraction. Despite the obvious risk of harm to the environment, the DSM Law has made great strides in regulating exploratory activities so as to meet the criteria of the UNCLOS. However, this article argues that neither the UNCLOS nor the DSM Law are adequately prepared to address transboundary harm triggered by the exploitation of offshore methane hydrates. In particular, the technology of such extraction is still at an experimental stage, and potential risks remain uncertain—and even untraceable—for cross-jurisdictional claims. The article intends to seek available legal instruments or models, to overhaul the incapacity within the current governing framework, and offers suggestions supporting national and international legislative efforts towards protecting the environment during methane hydrate extraction.

scholarly journals Formation of a Low-Density Liquid Phase during the Dissociation of Gas Hydrates in Confined Environments

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 590
Author(s):  
Lihua Wan ◽  
Xiaoya Zang ◽  
Juan Fu ◽  
Xuebing Zhou ◽  
Jingsheng Lu ◽  
...  
Keyword(s):  
Natural Gas ◽  
Methane Hydrate ◽  
Phase State ◽  
Solid Phase ◽  
Potential Method ◽  
Methane Hydrates ◽  
Low Density ◽  
Hydrate Dissociation ◽  
State Of Water ◽  
Confined Environment

The large amounts of natural gas in a dense solid phase stored in the confined environment of porous materials have become a new, potential method for storing and transporting natural gas. However, there is no experimental evidence to accurately determine the phase state of water during nanoscale gas hydrate dissociation. The results on the dissociation behavior of methane hydrates confined in a nanosilica gel and the contained water phase state during hydrate dissociation at temperatures below the ice point and under atmospheric pressure are presented. Fourier transform infrared spectroscopy (FTIR) and powder X-ray diffraction (PXRD) were used to trace the dissociation of confined methane hydrate synthesized from pore water confined inside the nanosilica gel. The characterization of the confined methane hydrate was also analyzed by PXRD. It was found that the confined methane hydrates dissociated into ultra viscous low-density liquid water (LDL) and methane gas. The results showed that the mechanism of confined methane hydrate dissociation at temperatures below the ice point depended on the phase state of water during hydrate dissociation.

scholarly journals Phase Behaviour of Methane Hydrates in Confined Media

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 201
Author(s):  
Hao Bian ◽  
Lu Ai ◽  
Klaus Hellgardt ◽  
Geoffrey C. Maitland ◽  
Jerry Y. Y. Heng
Keyword(s):  
Phase Behaviour ◽  
Methane Hydrates ◽  
Scanning Calorimetry ◽  
Macroporous Silica ◽  
Interfacial Energies ◽  
Temperature Method ◽  
Hydrate Phase ◽  
Dissociation Temperature ◽  
Confined Media ◽  
Decomposition Behaviour

In a study designed to investigate the melting behaviour of natural gas hydrates which are usually formed in porous mineral sediments rather than in bulk, hydrate phase equilibria for binary methane and water mixtures were studied using high-pressure differential scanning calorimetry in mesoporous and macroporous silica particles having controlled pore sizes ranging from 8.5 nm to 195.7 nm. A dynamic oscillating temperature method was used to form methane hydrates reproducibly and then determine their decomposition behaviour—melting points and enthalpies of melting. Significant decreases in dissociation temperature were observed as the pore size decreased (over 6 K for 8.5 nm pores). This behaviour is consistent with the Gibbs–Thomson equation, which was used to determine hydrate–water interfacial energies. The melting data up to 50 MPa indicated a strong, essentially logarithmic, dependence on pressure, which here has been ascribed to the pressure dependence of the interfacial energy in the confined media. An empirical modification of the Gibbs–Thomson equation is proposed to include this effect.

Fast formation kinetics of methane hydrates loaded by silver nanoparticle coated activated carbon (Ag-NP@AC)

2021 ◽  
Vol 417 ◽  
pp. 129206
Author(s):  
Guodong Zhang ◽  
Runcheng Zhang ◽  
Fei Wang
Keyword(s):  
Activated Carbon ◽  
Silver Nanoparticle ◽  
Methane Hydrates ◽  
Formation Kinetics ◽  
Kinetics Of

Evaluation of the depressurization based technique for methane hydrates reservoir dissociation in a marine setting, in the Krishna Godavari Basin, east coast of India

2015 ◽  
Vol 25 ◽  
pp. 226-235 ◽  
Author(s):  
N. Vedachalam ◽  
S. Ramesh ◽  
V.B.N. Jyothi ◽  
N. Thulasi Prasad ◽  
R. Ramesh ◽  
...  
Keyword(s):  
East Coast ◽  
Methane Hydrates ◽  
East Coast Of India ◽  
Godavari Basin

scholarly journals Decomposition of methane hydrates in sand, sandstone, clays, and glass beads

2004 ◽  
Vol 109 (B5) ◽  
Author(s):  
Tsutomu Uchida ◽  
Satoshi Takeya ◽  
Evgene M. Chuvilin ◽  
Ryo Ohmura ◽  
Jiro Nagao ◽  
...  
Keyword(s):  
Glass Beads ◽  
Methane Hydrates ◽  
Decomposition Of Methane

Dynamic properties of methane, water and methane hydrates using computational simulations

2010 ◽  
Vol 36 (3) ◽  
pp. 229-239 ◽  
Author(s):  
F. Castillo-Borja ◽  
R. Vázquez-Román ◽  
U.I. Bravo-Sánchez
Keyword(s):  
Dynamic Properties ◽  
Methane Hydrates ◽  
Computational Simulations
Sign in / Sign up

Export Citation Format

Share Document