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Structure and stability of ethane hydrate crystal

机译：乙烷水合物晶体的结构和稳定性

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The three-phase coexistence curve of the ethane hydrate + saturated water + saturated Liquid ethane was investigated in the temperature range from 290 to 324 K and pressure range from 20 to 479 Mfa. The equilibrium curve increases monotonically on a T-p diagram at these experimental conditions. The Raman spectra of the C-C symmetric stretching vibration mode of the C2H6 molecule split into two peaks, while a single peak is detected in the liquid ethane and aqueous phase. The split of the Raman peak reveals that the C2H6 molecules are entrapped in both the S- and M-cages of hydrate lattice, although the ethane hydrate has been believed as a typical gas hydrate which consists of filled M-cage and empty S-cage. The C-C vibration peak of ethane in the S-cage is very weak in a low pressure region and gradually increases in the high pressure region, that is, the degree of occupancy is considerably high at high pressures. The C-C vibration energy in the M-cage is almost independent of pressure while those in the aqueous solution and in the S-cage increase with pressure. The O-O vibration energy of the ethane hydrate lattice shows very weak pressure dependence while those of methane and CO2 hydrates are increased clearly with pressure. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 9]
机译：在290至324 K的温度范围和20至479 Mfa的压力范围内研究了乙烷水合物+饱和水+饱和液体乙烷的三相共存曲线。在这些实验条件下，平衡曲线在T-p图上单调增加。 C2H6分子的C-C对称拉伸振动模式的拉曼光谱分为两个峰，而在液相乙烷和水相中检测到一个峰。拉曼峰的分裂表明，C2H6分子同时存在于水合物晶格的S和M笼中，尽管乙烷水合物被认为是由填充的M笼和空的S笼组成的典型气体水合物。 S型保持架中乙烷的C-C振动峰在低压区域非常弱，而在高压区域逐渐增大，也就是说，在高压下的占用度非常高。 M-笼中的C-C振动能量几乎与压力无关，而水溶液和S-笼中的C-C振动能量随压力而增加。乙烷水合物晶格的O-O振动能量显示出非常弱的压力依赖性，而甲烷和CO2水合物的O-O振动能量随压力而明显增加。 （C）2000 Elsevier Science B.V.保留所有权利。 [参考：9]

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