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首页> 外文期刊>Crystal growth & design >Crystal Growth of Structure-H Hydrate with Water-Soluble Large Molecule Guest Compound: 1-Methylpiperidine as a Case Study
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Crystal Growth of Structure-H Hydrate with Water-Soluble Large Molecule Guest Compound: 1-Methylpiperidine as a Case Study

机译：用水溶性大分子访客化合物的结构-H水合物的晶体生长：1-甲基哌啶作为案例研究

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摘要

This paper presents visual observations of formation and growth of structure-H hydrate formed with methane and 1-methylpiperidine (MPD). MPD is one of the water-miscible guest compounds which form structure-H hydrates with a help gas. This guest promotes hydrate formation of the help gas and has an advantage of omitting the dissolution process in water during potential industrial utilization. The observed crystal growth dynamics were categorized into two types depending on the subcooling temperature ΔT _(sub), the difference between the phase equilibrium and experimental temperatures. At ΔT _(sub) = 2.8 K, the gas/liquid interface was covered by an agglomeration of hydrate grains. No remarkable hydrate growth was recognized after coverage of the gas/liquid interface. At ΔT _(sub) ≥ 4.9 K, hydrate crystals continued forming and growing even after the gas/liquid interface was covered by hydrates, which increased the amount of formed hydrate crystals compared to lower ΔT _(sub). The crystal shape changed from polygonal or platelike into pyramidal, and the size of individual crystals increased with the rise of ΔT _(sub), opposite the common trend where crystals become smaller at higher supercooling. Implications of the results of crystal morphology on suitable conditions for industrial utilization of this hydrate for gas capture applications are discussed.
机译：本文对甲烷和1-甲基哌啶（MPD）形成的结构H水合物的形成和生长进行了可视化观察。MPD是一种可与水混溶的客体化合物，它在帮助气体的作用下形成结构H水合物。该客体促进帮助气体的水合物形成，并且在潜在的工业利用过程中省略了在水中的溶解过程。根据过冷温度ΔT_sub（sub），以及相平衡温度和实验温度之间的差异，将观察到的晶体生长动力学分为两种类型。在ΔT_u2;（sub）=2.8K时，气液界面被水合物颗粒的凝聚所覆盖。覆盖气液界面后，未发现明显的水合物增长。在ΔT时（sub）≥ 4.9 K时，即使在气液界面被水合物覆盖后，水合物晶体仍在继续形成和生长，与较低的ΔT（sub）相比，水合物晶体的形成量增加。晶体形状从多边形或板状变为金字塔形，单个晶体的尺寸随着ΔT_u2;（sub）的增加而增加，与晶体在较高过冷度下变小的常见趋势相反。讨论了晶体形态结果对该水合物用于气体捕集应用的合适条件的影响。

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  • 来源
    《Crystal growth & design》 |2021年第2期|共7页
  • 作者

    Riku Matsuura; Saman Alavi; Ryo Ohmura;

  • 作者单位

    Department of Mechanical Engineering Keio University;

    Department of Chemistry and Biomolecular Sciences University of Ottawa;

    Department of Mechanical Engineering Keio University;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 晶体学;
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