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Ammonium Bromide

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Kazunari Ohgaki – 1st expert on this subject based on the ideXlab platform

  • Thermodynamic Properties of Hydrogen + Tetra–Butyl Ammonium Bromide Semi-Clathrate Hydrate
    Journal of Thermodynamics, 2009
    Co-Authors: Shunsuke Hashimoto, Takeshi Sugahara, Takaaki Tsuda, Kyohei Ogata, Yoshiro Inoue, Kazunari Ohgaki

    Abstract:

    Thermodynamic stability and hydrogen occupancy on the hydrogen + tetra- -butyl Ammonium Bromide semi-clathrate hydrate were investigated by means of Raman spectroscopic and phase equilibrium measurements under the three-phase equilibrium condition. The structure of mixed gas hydrates changes from tetragonal to another structure around 95 MPa and 292 K depending on surrounding hydrogen fugacity. The occupied amount of hydrogen in the semi-clathrate hydrate increases significantly associated with the structural transition. Tetra- -butyl Ammonium Bromide semi-clathrate hydrates can absorb hydrogen molecules by a pressure-swing without destroying the hydrogen bonds of hydrate cages at 15 MPa or over.

  • Thermodynamic stability of hydrogen ++ tetra-n-butyl Ammonium Bromide mixed gas hydrate in nonstoichiometric aqueous solutions
    Chemical Engineering Science, 2008
    Co-Authors: Shunsuke Hashimoto, Takeshi Sugahara, Hiroshi Sato, Masato Moritoki, Kazunari Ohgaki

    Abstract:

    Phase equilibrium (pressure–temperature) relations of the hydrogen ++ tetra-n-butyl Ammonium Bromide mixed gas hydrate system have been measured for various concentrations of tetra-n-butyl Ammonium Bromide aqueous solutions. The three-phase equilibrium curves obtained in the present study are shifted to the low-temperature or high-pressure side from that of the stoichiometric tetra-n  -butyl Ammonium Bromide solution. Each three-phase equilibrium curve of hydrogen ++ tetra-n-butyl Ammonium Bromide mixed gas hydrate converges at the atmospheric equilibrium point of the pure tetra-n  -butyl Ammonium Bromide hydrate for the mother aqueous solution of same mole fraction. The hydrate-cage occupancy of hydrogen in the hydrogen ++ tetra-n-butyl Ammonium Bromide mixed gas hydrate is in variable in a range of tetra-n-butyl Ammonium Bromide mole fraction from 0.006 to 0.070 in the aqueous solution. Hydrogen is entrapped only in the small cages of tetra-n-butyl Ammonium Bromide hydrates.

  • thermodynamic stability of hydrogen tetra n butyl Ammonium Bromide mixed gas hydrate in nonstoichiometric aqueous solutions
    Chemical Engineering Science, 2008
    Co-Authors: Shunsuke Hashimoto, Takeshi Sugahara, Hiroshi Sato, Masato Moritoki, Kazunari Ohgaki

    Abstract:

    Phase equilibrium (pressure–temperature) relations of the hydrogen ++ tetra-n-butyl Ammonium Bromide mixed gas hydrate system have been measured for various concentrations of tetra-n-butyl Ammonium Bromide aqueous solutions. The three-phase equilibrium curves obtained in the present study are shifted to the low-temperature or high-pressure side from that of the stoichiometric tetra-n  -butyl Ammonium Bromide solution. Each three-phase equilibrium curve of hydrogen ++ tetra-n-butyl Ammonium Bromide mixed gas hydrate converges at the atmospheric equilibrium point of the pure tetra-n  -butyl Ammonium Bromide hydrate for the mother aqueous solution of same mole fraction. The hydrate-cage occupancy of hydrogen in the hydrogen ++ tetra-n-butyl Ammonium Bromide mixed gas hydrate is in variable in a range of tetra-n-butyl Ammonium Bromide mole fraction from 0.006 to 0.070 in the aqueous solution. Hydrogen is entrapped only in the small cages of tetra-n-butyl Ammonium Bromide hydrates.

Dishun Zhao – 2nd expert on this subject based on the ideXlab platform

  • absorption and oxidation of h2s in caprolactam tetrabutyl Ammonium Bromide ionic liquid
    Energy & Fuels, 2011
    Co-Authors: Erhong Duan, Yongfei Zhong, Xuesong Zhang, Dishun Zhao

    Abstract:

    To explore environmentally benign solvents for absorbing and using H2S, a series of caprolactam tetrabutyl Ammonium Bromide ionic liquids were synthesized, the solubilities of H2S in which were measured at 303.2−363.2 K and atmospheric pressure. The solubility of H2S in the ionic liquid (1:1 mole ratio) was 5.40% at 303.2 K and ambient pressure, decreased sharply as temperature increased, and increased with the increasing mole ratio of caprolactam. The absorption and desorption of H2S were practically reversible in the ionic liquids, which was characterized by nuclear magnetic resonance. Using air, hydrogen sulfide could be oxidized to elemental S in the ionic liquids, which makes it easier to recycle hydrogen sulfide. Caprolactam tetrabutyl Ammonium Bromide ionic liquids would be useful for removing and reusing H2S in pollution control and could be regarded as the most potential absorbent and recoverer of H2S.

  • Absorption and oxidation of H2S in caprolactam tetrabutyl Ammonium Bromide ionic liquid
    Energy and Fuels, 2011
    Co-Authors: Bin Guo, Erhong Duan, Yongfei Zhong, Liang Gao, Xuesong Zhang, Dishun Zhao

    Abstract:

    To explore environmentally benign solvents for absorbing and using H 2 S, a series of caprolactam tetrabutyl Ammonium Bromide ionic liquids were synthesized, the solubilities of H 2 S in which were measured at 303.2-363.2 K and atmospheric pressure. The solubility of H 2 S in the ionic liquid (1:1 mole ratio) was 5.40% at 303.2 K and ambient pressure, decreased sharply as temperature increased, and increased with the increasing mole ratio of caprolactam. The absorption and desorption of H 2 S were practically reversible in the ionic liquids, which was characterized by nuclear magnetic resonance. Using air, hydrogen sulfide could be oxidized to elemental S in the ionic liquids, which makes it easier to recycle hydrogen sulfide. Caprolactam tetrabutyl Ammonium Bromide ionic liquids would be useful for removing and reusing H 2 S in pollution control and could be regarded as the most potential absorbent and recoverer of H 2 S. © 2010 American Chemical Society.

Erhong Duan – 3rd expert on this subject based on the ideXlab platform

  • Anaerobic biodegradability and toxicity of caprolactam-tetrabutyl Ammonium Bromide ionic liquid to methanogenic gas production
    RSC Advances, 2013
    Co-Authors: Erhong Duan, Zaixing Li, Yu Song, Jian Guan, Kun Yang

    Abstract:

    The anaerobic biodegradability and toxicity of caprolactam-tetrabutyl Ammonium Bromide ionic liquid to methanogenic gas production were investigated in this study. Both methane production and chemical oxygen demand removal from liquid wastewater decreased with increasing concentrations of the ionic liquid. The toxicity of caprolactam-tetrabutyl Ammonium Bromide ionic liquid to methanogenic gas production was clear. During the sludge digestion incubation period, domesticated microorganisms acclimated to caprolactam-tetrabutyl Ammonium Bromide ionic liquid and were able to adapt to the ionic liquid solutions. The pH of the control sample was stable for 15 days and then slowly increased. The caprolactam-tetrabutyl Ammonium Bromide ionic liquid takes a longtime to be digested. Therefore, caprolactam-tetrabutyl Ammonium Bromide ionic liquids are biodegradable.

  • absorption and oxidation of h2s in caprolactam tetrabutyl Ammonium Bromide ionic liquid
    Energy & Fuels, 2011
    Co-Authors: Erhong Duan, Yongfei Zhong, Xuesong Zhang, Dishun Zhao

    Abstract:

    To explore environmentally benign solvents for absorbing and using H2S, a series of caprolactam tetrabutyl Ammonium Bromide ionic liquids were synthesized, the solubilities of H2S in which were measured at 303.2−363.2 K and atmospheric pressure. The solubility of H2S in the ionic liquid (1:1 mole ratio) was 5.40% at 303.2 K and ambient pressure, decreased sharply as temperature increased, and increased with the increasing mole ratio of caprolactam. The absorption and desorption of H2S were practically reversible in the ionic liquids, which was characterized by nuclear magnetic resonance. Using air, hydrogen sulfide could be oxidized to elemental S in the ionic liquids, which makes it easier to recycle hydrogen sulfide. Caprolactam tetrabutyl Ammonium Bromide ionic liquids would be useful for removing and reusing H2S in pollution control and could be regarded as the most potential absorbent and recoverer of H2S.

  • Absorption and oxidation of H2S in caprolactam tetrabutyl Ammonium Bromide ionic liquid
    Energy and Fuels, 2011
    Co-Authors: Bin Guo, Erhong Duan, Yongfei Zhong, Liang Gao, Xuesong Zhang, Dishun Zhao

    Abstract:

    To explore environmentally benign solvents for absorbing and using H 2 S, a series of caprolactam tetrabutyl Ammonium Bromide ionic liquids were synthesized, the solubilities of H 2 S in which were measured at 303.2-363.2 K and atmospheric pressure. The solubility of H 2 S in the ionic liquid (1:1 mole ratio) was 5.40% at 303.2 K and ambient pressure, decreased sharply as temperature increased, and increased with the increasing mole ratio of caprolactam. The absorption and desorption of H 2 S were practically reversible in the ionic liquids, which was characterized by nuclear magnetic resonance. Using air, hydrogen sulfide could be oxidized to elemental S in the ionic liquids, which makes it easier to recycle hydrogen sulfide. Caprolactam tetrabutyl Ammonium Bromide ionic liquids would be useful for removing and reusing H 2 S in pollution control and could be regarded as the most potential absorbent and recoverer of H 2 S. © 2010 American Chemical Society.