Abstract

Results are presented from studying the metastable states of Freon-12 gas hydrate via pulsed NMR in the range of thermodynamic parameters limited by the line of ice–hydrate–gas and supercooled water–hydrate–gas equilibrium in the P–T phase diagram. The dependence is found for the lifetime of metastable Freon-12 gas hydrate on a sample’s temperature and degree of hydrate formation. New data on the conditions of the stability and decomposition of the metastable states of the given gas hydrate are obtained using samples with 100% conversion of water to the former. It is found that the crystallization of water formed upon the dissociation of Freon-12 gas hydrate into supercooled water and gas alters the mechanism of dissociation. A scheme for the formation of water/ice upon the dissociation of gas hydrates is proposed to explain the experimental data.

中文翻译：

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亚稳气体水合物的稳定性和分解特性

摘要

结果表明，通过脉冲NMR研究氟里昂12气体水合物的亚稳态，在热力学参数范围内受P – T中的冰水合物–气体和过冷水–水合物–气体平衡线的限制。相图。发现亚稳态氟利昂12气水合物的寿命与样品温度和水合物形成程度有关。使用将水100％转化为前者的水合物样品，获得了有关给定气体水合物的稳定性和亚稳态分解条件的新数据。发现氟利昂12气体水合物分解成过冷的水和气体后形成的水的结晶改变了离解的机理。提出了一种在气体水合物分解时形成水/冰的方案，以解释实验数据。