Observations of CO_2-hydrate decomposition and reformation processes

T. Uchida; T. Ebinuma; H. Narita

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Observations of CO_2-hydrate decomposition and reformation processes

机译：CO_2水合物分解和重整过程的观察

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We observed CO_2 hydrate decomposition and reformation (re-growth) through temperature and pressure changes using a microscope. At pressures above CO_2 vapor-liquid equilibrium P_s, decomposition from increasing temperatures left small liquid CO_2 drops in the solution phase. Conversely, below P_s, decomposition from increasing temperatures was more rapid due to the release of CO_2 gas that mechanically broke the hydrate apart. Similarly, hydrate decomposition by a pressure decrease also released CO_2 gas that broke the hydrate apart. Reformation occurred more readily only by cooling, not by a pressure increase. A barrier to CO_2 nucleation can explain this memory effect by allowing a greater concentration of CO_2 to be left in the aqueous solution after hydrate decomposition.

机译：我们使用显微镜通过温度和压力变化观察了CO_2水合物的分解和重整（重新生长）。在高于CO_2气液平衡P_s的压力下，温度升高引起的分解使少量液态CO_2滴入溶液相。相反，在P_s以下，由于释放的CO_2气体将水合物机械分解，因此温度升高引起的分解更快。类似地，由于压力降低而引起的水合物分解也释放出CO_2气体，使水合物分解。仅通过冷却而不是通过压力增加，更容易发生重整。 CO_2成核的障碍可以通过在水合物分解后在水溶液中保留更高浓度的CO_2来解释这种记忆效应。

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来源
《Journal of Crystal Growth》 |2000年第2期|p.189-200|共12页
作者
T. Uchida; T. Ebinuma; H. Narita;
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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种 eng
中图分类晶体学;
关键词
CO_2 hydrate; decomposition; reformation; memory effect; phase separation rate;

机译：CO_2水合物分解重组记忆效应相分离率;

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Observations of CO_2-hydrate decomposition and reformation processes

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