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首页> 外文期刊>AIChE Journal >Structure and Kinetics of Gas Hydrates from Methane/Ethane/Propane Mixtures Relevant to the Design of Natural Gas Hydrate Storage and Transport Facilities
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Structure and Kinetics of Gas Hydrates from Methane/Ethane/Propane Mixtures Relevant to the Design of Natural Gas Hydrate Storage and Transport Facilities

机译：甲烷/乙烷/丙烷混合物中天然气水合物的结构和动力学与天然气水合物储运设施的设计有关

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摘要

The kinetics of gas hydrate growth from binary CH4/C2H6 and CH4/C3H8 and ternary CH4/C2H6/C3H8 gas mixtures were obtained by the gas uptake method in a semibatch stirred vessel at constant pressure and a temperature of 273.7 K. These data are of interest for the design of facilities for natural gas storage and transportation in the solid (hydrate) state. During hydrate formation, samples from the gas phase were taken and analyzed by gas chromatography. It was found that the molar composition of CH4 in the vapor phase increased as hydrate crystallization progressed. The observed fractionation effect (enrichment of the hydrate phase with propane) complicates the natural gas storage process. The fractionation effect was also confirmed with molecular-level studies where hydrate from the CH4/C2H6/ C3H8 gas mixture was characterized by powder X-ray diffraction (PXRD), NMR, and Raman spectroscopy. The hydrate phase composition and cage occupancy of each gas were calculated with the help of information obtained by Raman spectroscopy, gas chromatography, and PXRD. The results were consistent with those obtained by NMR. The composition of the gas phase and the hydrate are found to evolve over time, suggesting that kinetic and transport factors contribute in addition to thermodynamics.
机译：在半分批搅拌容器中，在恒定压力和273.7 K的温度下，通过气体吸收方法获得了由二元CH4 / C2H6和CH4 / C3H8和三元CH4 / C2H6 / C3H8混合气生成的水合物的动力学。对固态（水合物）状态的天然气储存和运输设施设计的兴趣。在水合物形成期间，从气相中取样并通过气相色谱分析。发现随着水合物结晶的进行，气相中CH 4的摩尔组成增加。观察到的分馏效果（用丙烷富集水合物）使天然气的储存过程复杂化。分馏效果也得到了分子水平研究的证实，其中来自CH4 / C2H6 / C3H8气体混合物的水合物通过粉末X射线衍射（PXRD），NMR和拉曼光谱进行了表征。借助拉曼光谱，气相色谱和PXRD获得的信息，计算出每种气体的水合相组成和笼式占有率。结果与通过NMR获得的结果一致。发现气相和水合物的组成会随着时间而变化，这表明除了热力学以外，动力学和传输因子也有贡献。

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