Thermodynamic properties and gas capacities of ionic clathrate hydrates for industrial application

2016 Fiscal Year Final Research Report

• Project/Area Number: 26820069
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Thermal engineering
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Muromachi Sanehiro 国立研究開発法人産業技術総合研究所, 創エネルギー研究部門, 研究員 (50711785)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: イオン性クラスレートハイドレート / 相平衡 / 蓄熱 / ガス分離 / 結晶構造 / 高圧

Outline of Final Research Achievements

Ionic clathrate hydrates (ICHs) are crystalline compounds which can form at around room temperature. They also incorporate small gases under their gas pressure. Based on these properties, industrial applications for air conditioning and gas separation are suggested. To form ICHs, ionic guest substances are necessary. There is potential to control the functional properties by designing the ionic guests. In this study, ICHs were formed by the tetra-n-butylammonium cation with various organic acid anions, and their properties were characterized.
New ICHs were formed with hydroxycarboxylic anions. ICHs with the carboxylic anions were also formed under a gas pressure to incorporate it. Their formation conditions with CH4 or CO2 gas were measured, and the hydrate phases were identified by X-ray diffraction. Gas separation experiments were also implemented with a CH4 + CO2 mixed gas. From the results, knowledge for controlling the functional properties of ICHs was obtained.

Free Research Field

熱工学