相关实验视频
Updated: Jun 27, 2025

08:46
Methane Hydrate Crystallization on Sessile Water Droplets
Published on: May 26, 2021
2.4K
在不同温度,压力和乙烯糖醇度下,用二氧化碳替换甲水合物的分子动态模拟研究
Ping Guo1, Yi-Lun Song1, Huang Liu1
1State Key Lab of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Rd. 8, Xindu District, Chengdu, Sichuan 610500, PR China.
ACS omega
|May 6, 2024
概括
本研究探讨使用二氧化碳 (CO2) 替代天然气水合物中的甲,改善能源提取和二氧化碳储存. 较低的温度和特定的压力有利于二氧化碳水合物形成,而乙烯基醇则有利于乙烯基醇.
科学领域:
- 能源科学与工程 能源科学与工程
- 地质化学和石油地质学
- 材料科学和分子模拟
背景情况:
- 全球能源需求需要高效的天然气水合物 (NGH) 提取.
- CH4-CO2替代方法提供了NGH开采和二氧化碳 (CO2) 地质储存的双重好处.
- 了解二氧化碳替代过程中的分子相互作用对于优化这一过程至关重要.
研究的目的:
- 在不同温度,压力和乙烯糖醇 (EG) 度下,以二氧化碳取代甲水合物的分子动力学研究.
- 评估这些条件对水合物稳定性,子结构和二氧化碳吸收的影响.
- 确定增强NGH回收和二氧化碳封存效率的最佳条件.
主要方法:
- 开发了一种CO2-水合物分子模型和三个具有不同EG度的CO2/EG-水合物模型.
- 模拟分子动力学以分析辐射分布函数 (RDF),平均平方位移 (MSD) 和相对密度.
- 系统地改变温度 (270-290 K),压力 (1-7 MPa) 和EG度以评估它们的影响.
主要成果:
- 较低的温度 (例如270 K) 会促进二氧化碳分子的进入和二氧化碳水合物的形成.
- 压力变化对280 K的甲水合物分解和二氧化碳进入的影响很小,尽管1 MPa稍微更有利.
- 乙烯甘醇 (EG) 的添加最初会抑制甲水合物分解,但较高度会加速;纯CO2会导致更大的子骨折,而EG则有助于CO2进入.
结论:
- CH4-CO2替代过程对温度敏感,较低的温度有利于CO2水合物形成.
- 虽然压力具有有限的影响,但特定条件会增加二氧化碳分子的入.
- 乙烯基醇的作用很复杂;它促进了二氧化碳的进入,但必须控制其度,以平衡水合物稳定性和分解.
相关概念视频
Turbulent Flow: Problem Solving
120
Carbonation is a process used to dissolve carbon dioxide gas in a liquid, commonly used in the production of carbonated beverages. Achieving efficient carbonation requires careful control of temperature, pressure, and flow conditions. By adjusting these parameters, carbonation efficiency can be maximized, producing a higher concentration of CO2 in the liquid.
Temperature is a key factor in CO2 solubility. In this case, the CO2 gas and the liquid are cooled to 20°C. Lower temperatures...
Temperature is a key factor in CO2 solubility. In this case, the CO2 gas and the liquid are cooled to 20°C. Lower temperatures...
120
Inductive Effects on Chemical Shift: Overview
1.1K
The protons in unsubstituted alkanes are strongly shielded with chemical shifts below 1.8 ppm. Methine, methylene, and methyl protons appear at approximately 1.7, 1.2 and 0.7 ppm, while the proton signal from methane appears at 0.23 ppm. An electronegative substituent, such as chlorine, withdraws the electron density from the protons, increasing their chemical shift. Progressive substitution of the hydrogens in methane by chlorine shifts the proton signals increasingly downfield, to 3.05 ppm in...
1.1K
Phase Diagrams
40.6K
A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
40.6K
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration
8.4K
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
8.4K
Clausius-Clapeyron Equation
56.7K
The equilibrium between a liquid and its vapor depends on the temperature of the system; a rise in temperature causes a corresponding rise in the vapor pressure of its liquid. The Clausius-Clapeyron equation gives the quantitative relation between a substance’s vapor pressure (P) and its temperature (T); it predicts the rate at which vapor pressure increases per unit increase in temperature.
56.7K
Applications of the Ideal Gas Law: Molar Mass, Density, and Volume
56.6K
The volume occupied by one mole of a substance is its molar volume. The ideal gas law, PV = nRT, suggests that the volume of a given quantity of gas and the number of moles in a given volume of gas vary with changes in pressure and temperature. At standard temperature and pressure, or STP (273.15 K and 1 atm), one mole of an ideal gas (regardless of its identity) has a volume of about 22.4 L — this is referred to as the standard molar volume.
56.6K

