Clathrate hydrate crystal growth in liquid water saturated with a guest substance: Observations in a methane + water system

Ryo Ohmura, Sadatoshi Matsuda, Tsutomu Uchida, Takao Ebinuma, Hideo Narita

研究成果: Article査読

100 被引用数 (Scopus)

抄録

This paper reports on a visual study of formation and growth of clathrate hydrate crystals in liquid water saturated (prior to hydrate formation) and in contact with methane gas under the pressure of 6-10 MPa at a temperature of 273.5 K. Irrespective of the pressure set in the experimental system, in most of the experimental runs we observed that a hydrate film first formed to intervene between methane gas and liquid water, and then hydrate crystals grew in liquid water from the hydrate film. Distinct variations in the morphology of hydrate crystals grown in liquid water were observed depending on the pressure. At pressures of 6-8 MPa, hydrate crystals with skeletal, columnar morphology were observed. At the pressure of 10 MPa, the skeletal, columnar crystals were replaced by dendritic crystals. The dependency of the morphology on the degree of driving force for mass-transfer-controlled hydrate-crystal growth is discussed, comparing the present observations with those reported in the literature. Another category of hydrate formation and growth was observed in some experimental runs. The hydrate crystals first formed at the inner surface of the test cell in contact with liquid water instead of the methane-water interface. These crystals floated up to the methane-water interface, where they became a polycrystalline hydrate film, and continued to grow in liquid water.

本文言語English
ページ(範囲)953-957
ページ数5
ジャーナルCrystal Growth and Design
5
3
DOI
出版ステータスPublished - 2005 5月
外部発表はい

ASJC Scopus subject areas

  • 化学一般
  • 材料科学一般
  • 凝縮系物理学

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