Dissociation heat of mixed-gas hydrate composed of methane and ethane

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  • HACHIKUBO Akihiro
    New Energy Resources Research Center, Kitami Institute of Technology
  • KIDA Masato
    Methane Hydrate Research Center, National Institute of Advanced Industrial Science and Technology,
  • SAKAGAMI Hirotoshi
    New Energy Resources Research Center, Kitami Institute of Technology
  • SHOJI Hitoshi
    New Energy Resources Research Center, Kitami Institute of Technology

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Other Title
  • メタン・エタンからなる混合ガスハイドレートの解離熱
  • メタン エタン カラ ナル コンゴウ ガスハイドレート ノ カイリ ネツ

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Abstract

The dissociation heat of gas hydrates is one of the important parameters that control the formation/dissociation speed of the gas hydrate. We investigated the effect of the ethane concentration on the dissociation heat of the mixed-gas (methane and ethane) hydrate. The dissociation heat of the mixed-gas hydrate [kJ mol-1] was within the range between the dissociation heat of pure methane hydrate and that of ethane hydrate, and it increased with the ethane concentration. Only several % of ethane composition was quite effective to increase the dissociation heat. The hydration number, which changed according to the crystal structure (sI/sII hydrates), determined the dissociation heat during the transition from hydrate to gas and water. The dissociation heat of the mixed-gas hydrate [kJ kg-1] was 6-30 % greater than that of pure methane and ethane hydrates during the transition from hydrate to gas and ice, and 3-8% greater during the transition from hydrate to gas and water.

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