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Ryo Ohmura,Hiroaki Hayama,Hotaka Akiba,Yuki Asami 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.6
This study reports a visual observation of the formation and growth of ionic semiclathrate hydrate on the surface of a Tetrabutylammonium bromide (TBAB) aqueous solution and CO2+N2 gas mixture. The composition of CO2+N2 gas mixture was 20 : 80. The experimental temperature range was from 280 K to 290 K, under the pressures of 2.3MPa and 4.7MPa, at wTBAB=0.10 and wTBAB=0.40, where wTBAB denotes the mass fraction of TBAB in the aqueous solution. At wTBAB=0.40, the hydrate crystals were initially observed to grow within the droplet, and followed by lateral growth at the droplet surface; but at wTBAB=0.10, the hydrate crystals grew exclusively in the liquid phase and did not cover the droplet surface. Two types of different crystals with different sizes were clearly observed.
Hironori D. Nagashima,Saman Alavi,Ryo Ohmura 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.54 No.-
To investigate the preservation of CO2 clathrate hydrate in the presence of fructose or glucose and absence of sugars, CO2 hydrate samples were preserved at 238.2 K, 253.2 K and 258.2 K under atmospheric pressure for three weeks. The preservations of CO2 hydrate with those two monosaccharide sugars at both 238.2 K and 253.2 K were lower than that of the pure CO2 hydrate without the sugars. The results indicated that the viscosity of super-cooled or stable sugar aqueous solution and occurrence of super-cooled water in the sample hydrate particles are significant factors in the preservation of CO2 hydrate.
Masamichi Kodera,Kosuke Watanabe,Maxence Lassiège,Saman Alavi,Ryo Ohmura 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-
Interfacial tension is one of the most important physical properties for high-precision simulations todevelop the methods of preventing plugging of pipelines in the oil and natural gas industry. This paperreports experimental data with the pendant drop method for the interfacial tension of adecane + methane + water system at temperatures between 278.2 K to 298.2 K and pressures up to10 MPa. The data show that in this temperature range the interfacial tension in the decane + methane+ water system decreases almost linearly with increasing temperature. The results also show that byincreasing the pressure of methane, the interfacial tension decreases from 53.98 mN m 1 to50.23 mN m 1 at 283.2 K and 52.23 mN m 1 to 49.74 mN m 1 at 288.2 K. The nature of the methanepressure dependence of the interfacial tension changes for pressures above around 2.00 MPa. Theinterfacial tension decreases with the pressure up to 2.00 MPa, but has no pressure dependence above2.00 MPa. It may be inferred that the decane/water interface is saturated with methane at pressuresaround 2.00 MPa and at higher pressure the interfacial tension is no longer affected by the presence ofmethane.