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首页> 外文期刊>Chemistry: A European journal >Crystal growth of clathrate hydrate in gas/liquid/liquid system: Variations in crystal-growth behavior
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Crystal growth of clathrate hydrate in gas/liquid/liquid system: Variations in crystal-growth behavior

机译：气/液/液系统中包合物水合物的晶体生长：晶体生长行为的变化

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This paper reports the visual observations of the formation and growth of structure-II hydrate crystals on a water droplet partially immersed in liquid cyclopentane and exposed to difluoromethane gas. Each of the experiments was performed under prescribed temperature and pressure conditions in the range from 281.7 to 297.0 K and from 0.12 to 1.10 MPa in order to investigate the effect of the driving force for the hydrate crystal growth. The experiments were conducted at 25 different temperature-pressure conditions. It was found that the behavior of the hydrate crystal growth in this three-component system can be classified into three modes, which we called "cover", "expansion" and "line", depending on the temperature and pressure. The descriptions of the three types are summarized as follows. "Cover": Hydrate crystals first formed on the water-droplet surface and then grew to form a polycrystalline layer covering the surface. After complete surface coverage, no more hydrate growth and little change in the shape of the hydrate-covered water droplet were observed. "Expansion": Like "cover", the first crystals were observed on the water-droplet surface. They grew not only along the surface, but also toward the gas phase, and then continued to grow for more than several tens of minutes after complete coverage. "Line": Unlike the other two modes, hydrate crystals first formed at the three-phase interfacial line and grew along this line. The shape of the hydrate crystals eventually became like a doughnut, since the center of the water droplet collapsed when they grew.
机译：本文报道了部分浸入液体环戊烷并暴露于二氟甲烷气体中的水滴上II型水合物晶体的形成和生长的视觉观察结果。为了研究驱动力对水合物晶体生长的影响，在规定的温度和压力条件下进行的每个实验均在281.7至297.0 K和0.12至1.10 MPa的范围内。实验是在25种不同的温度-压力条件下进行的。发现在该三组分体系中水合物晶体生长的行为可以根据温度和压力分为三种模式，我们称其为“覆盖”，“膨胀”和“线”。三种类型的描述总结如下。 “覆盖物”：水合物晶体首先在水滴表面上形成，然后生长以形成覆盖该表面的多晶层。在完全覆盖表面之后，没有观察到更多的水合物生长，并且水合物覆盖的水滴的形状几乎没有变化。 “膨胀”：像“盖”一样，在水滴表面上观察到第一批晶体。它们不仅沿表面生长，而且向气相生长，然后在完全覆盖后继续生长数十分钟。 “线”：与其他两种模式不同，水合物晶体首先在三相界面线处形成并沿该线生长。水合物晶体的形状最终变得像甜甜圈，因为水滴的中心在生长时会坍塌。

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