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Deqing Liang - One of the best experts on this subject based on the ideXlab platform.
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investigation of kinetics of Tetrabutylammonium Chloride tbac ch4 semiclathrate hydrate formation
RSC Advances, 2017Co-Authors: Lingli Shi, Deqing LiangAbstract:For potential application in advanced gas storage at moderate temperatures, a systematic study on Tetrabutylammonium Chloride (TBAC) + CH4 semiclathrate hydrate formation kinetics was conducted using isobaric kinetics measurements to evaluate the effects of pressure (6.0, 3.0 MPa), temperature (278 K, subcooling degree of 6 K), and salt concentration (0.10, 0.20, 0.30, 0.34, 0.45 mass fraction). The results revealed that the systems showed shorter induction time, higher normalized gas consumption and higher rapid growth rate under a higher supersaturation environment, represented by higher pressure or lower temperature. Besides, the effect of salt concentration was complicated. With the increase of salt concentration, the total gas consumption was almost the same while the normalized gas consumption decreased greatly, indicating that the amount of CH4 trapped in the hydrate unit greatly decreased and the system with low salt concentration was a good choice for advanced gas storage. In addition, a Raman device was employed to reveal the structural properties. The spectra showed that the (TBAC + CH4) semiclathrate hydrates were formed with hexagonal structure or tetragonal structure under different salt concentrations, which were different from the structures of pure TBAC hydrate. It was assumed that at low salt concentrations the addition of CH4 induced the formation of hexagonal structure since it had three 512 cages per TBAC which was higher than that of the tetragonal structure.
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Dissociation Temperatures of Mixed Semiclathrate Hydrates Formed with Tetrabutylammonium Bromide Plus Tetrabutylammonium Chloride
Journal of Chemical & Engineering Data, 2016Co-Authors: Lingli Shi, Xiaodong Shen, Deqing LiangAbstract:Dissociation temperatures of mixed Tetrabutylammonium bromide (TBAB) + Tetrabutylammonium Chloride (TBAC) semiclathrate hydrates were determined by using the DSC technique. The system was measured in five groups with a fixed total mole fraction (x = 0.0100, 0.0200, and 0.0337), TBAB mole fraction (xTBAB = 0.0370) or TBAC mole fraction (xTBAC = 0.0337). The obtained results demonstrated that at a given x, the dissociation temperatures of mixed (TBAB + TBAC) semiclathrate hydrates were all higher than that of pure TBAB hydrate, and the maximum dissociation temperature appeared at xTBAB/x = 0.25 instead of xTBAB/x = 0 or 1 (corresponding to pure TBAC or TBAB hydrate). In addition, for systems with fixed xTBAB or xTBAC, TBAC gained the control of forming TBAC semiclathrate hydrate preferentially.
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Phase Equilibrium Data of the Double Tetrabutylammonium Chloride Plus Carbon Dioxide or Nitrogen Semiclathrate Hydrate
Journal of Chemical & Engineering Data, 2014Co-Authors: Lingli Shi, Deqing LiangAbstract:In this paper, phase equilibrium data of the double Tetrabutylammonium Chloride (TBACl: C16H36ClN) semiclathrate hydrate with a guest gas (CO2 or N2) at four different TBACl concentrations (0.06, 0.15, 0.34, and 0.44 mass fraction) were experimentally measured by employing an isochoric pressure-search method in the temperature range of (282.9 to 293.2) K and at pressures up to 13.57 MPa, respectively. The results demonstrated that double TBACl + CO2 (or N2) semiclathrate hydrates had an obvious advantage in thermal stability compared to pure CO2 (or N2) hydrates. And the strongest stabilization effect was observed with the application of TBACl at 0.34 mass fraction, corresponding to TBACl·30H2O. In addition, the results were compared with the corresponding data reported in open literature. The comparisons showed that some literature data seemed to be not reliable.
Lingli Shi - One of the best experts on this subject based on the ideXlab platform.
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investigation of kinetics of Tetrabutylammonium Chloride tbac ch4 semiclathrate hydrate formation
RSC Advances, 2017Co-Authors: Lingli Shi, Deqing LiangAbstract:For potential application in advanced gas storage at moderate temperatures, a systematic study on Tetrabutylammonium Chloride (TBAC) + CH4 semiclathrate hydrate formation kinetics was conducted using isobaric kinetics measurements to evaluate the effects of pressure (6.0, 3.0 MPa), temperature (278 K, subcooling degree of 6 K), and salt concentration (0.10, 0.20, 0.30, 0.34, 0.45 mass fraction). The results revealed that the systems showed shorter induction time, higher normalized gas consumption and higher rapid growth rate under a higher supersaturation environment, represented by higher pressure or lower temperature. Besides, the effect of salt concentration was complicated. With the increase of salt concentration, the total gas consumption was almost the same while the normalized gas consumption decreased greatly, indicating that the amount of CH4 trapped in the hydrate unit greatly decreased and the system with low salt concentration was a good choice for advanced gas storage. In addition, a Raman device was employed to reveal the structural properties. The spectra showed that the (TBAC + CH4) semiclathrate hydrates were formed with hexagonal structure or tetragonal structure under different salt concentrations, which were different from the structures of pure TBAC hydrate. It was assumed that at low salt concentrations the addition of CH4 induced the formation of hexagonal structure since it had three 512 cages per TBAC which was higher than that of the tetragonal structure.
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Dissociation Temperatures of Mixed Semiclathrate Hydrates Formed with Tetrabutylammonium Bromide Plus Tetrabutylammonium Chloride
Journal of Chemical & Engineering Data, 2016Co-Authors: Lingli Shi, Xiaodong Shen, Deqing LiangAbstract:Dissociation temperatures of mixed Tetrabutylammonium bromide (TBAB) + Tetrabutylammonium Chloride (TBAC) semiclathrate hydrates were determined by using the DSC technique. The system was measured in five groups with a fixed total mole fraction (x = 0.0100, 0.0200, and 0.0337), TBAB mole fraction (xTBAB = 0.0370) or TBAC mole fraction (xTBAC = 0.0337). The obtained results demonstrated that at a given x, the dissociation temperatures of mixed (TBAB + TBAC) semiclathrate hydrates were all higher than that of pure TBAB hydrate, and the maximum dissociation temperature appeared at xTBAB/x = 0.25 instead of xTBAB/x = 0 or 1 (corresponding to pure TBAC or TBAB hydrate). In addition, for systems with fixed xTBAB or xTBAC, TBAC gained the control of forming TBAC semiclathrate hydrate preferentially.
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Phase Equilibrium Data of the Double Tetrabutylammonium Chloride Plus Carbon Dioxide or Nitrogen Semiclathrate Hydrate
Journal of Chemical & Engineering Data, 2014Co-Authors: Lingli Shi, Deqing LiangAbstract:In this paper, phase equilibrium data of the double Tetrabutylammonium Chloride (TBACl: C16H36ClN) semiclathrate hydrate with a guest gas (CO2 or N2) at four different TBACl concentrations (0.06, 0.15, 0.34, and 0.44 mass fraction) were experimentally measured by employing an isochoric pressure-search method in the temperature range of (282.9 to 293.2) K and at pressures up to 13.57 MPa, respectively. The results demonstrated that double TBACl + CO2 (or N2) semiclathrate hydrates had an obvious advantage in thermal stability compared to pure CO2 (or N2) hydrates. And the strongest stabilization effect was observed with the application of TBACl at 0.34 mass fraction, corresponding to TBACl·30H2O. In addition, the results were compared with the corresponding data reported in open literature. The comparisons showed that some literature data seemed to be not reliable.
Kenzo Tabuchi - One of the best experts on this subject based on the ideXlab platform.
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phase transfer photopolymerization of methyl methacrylate with Tetrabutylammonium Chloride kscn ccl4 in an aqueous organic two phase system
Polymer Journal, 1991Co-Authors: Shozo Shimada, Kenzo Tabuchi, Masahiro TsunookaAbstract:Phase-Transfer Polymerization of Methyl Methacrylate with Tetrabutylammonium Chloride–Na 2 S 2 O 4 -CCl 4 in an Aqueous-Organic Two-Phase System
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Phase-Transfer Polymerization of Methyl Methacrylate with Tetrabutylammonium Chloride–Na_2S_2O_4-CCl_4 in an Aqueous-Organic Two-Phase System
Polymer Journal, 1991Co-Authors: Shozo Shimada, Yasuhiko Obata, Katsuhiko Nakagawa, Kenzo TabuchiAbstract:The phase-transfer polymerization of methyl methacrylate with Tetrabutylammonium Chloride (TBACl)–Na_2S_2O_4-CCl_4 initiator system was investigated in an aqueous-organic two-phase system. The initial rate of polymerization ( R _p) was found to be proportional to the fed quantity of TBACl and square root of the fed quantity of Na_2S_2O_4 and CCl_4. A cyclic phase-transfer initiation mechanism has been proposed to account for the experimental data.
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Phase-transfer polymerization of methyl methacrylate wity Tetrabutylammonium Chloride-Na2S2O4-CCl4 in an aqueous-organic two-phase system
Polymer Journal, 1991Co-Authors: Shozo Shimada, Yasuhiko Obata, Katsuhiko Nakagawa, Kenzo TabuchiAbstract:The initial rate of polymerization was found to be proportional to the fed quantity of Tetrabutylammonium Chloride and square root of the fed quantity of Na 2 S 2 O 4 and CCl 4 . A cyclic phase transfer initiation mechanism was proposed to account for the experimental data.
Shozo Shimada - One of the best experts on this subject based on the ideXlab platform.
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phase transfer photopolymerization of methyl methacrylate with Tetrabutylammonium Chloride kscn ccl4 in an aqueous organic two phase system
Polymer Journal, 1991Co-Authors: Shozo Shimada, Kenzo Tabuchi, Masahiro TsunookaAbstract:Phase-Transfer Polymerization of Methyl Methacrylate with Tetrabutylammonium Chloride–Na 2 S 2 O 4 -CCl 4 in an Aqueous-Organic Two-Phase System
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Phase-Transfer Polymerization of Methyl Methacrylate with Tetrabutylammonium Chloride–Na_2S_2O_4-CCl_4 in an Aqueous-Organic Two-Phase System
Polymer Journal, 1991Co-Authors: Shozo Shimada, Yasuhiko Obata, Katsuhiko Nakagawa, Kenzo TabuchiAbstract:The phase-transfer polymerization of methyl methacrylate with Tetrabutylammonium Chloride (TBACl)–Na_2S_2O_4-CCl_4 initiator system was investigated in an aqueous-organic two-phase system. The initial rate of polymerization ( R _p) was found to be proportional to the fed quantity of TBACl and square root of the fed quantity of Na_2S_2O_4 and CCl_4. A cyclic phase-transfer initiation mechanism has been proposed to account for the experimental data.
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Phase-transfer polymerization of methyl methacrylate wity Tetrabutylammonium Chloride-Na2S2O4-CCl4 in an aqueous-organic two-phase system
Polymer Journal, 1991Co-Authors: Shozo Shimada, Yasuhiko Obata, Katsuhiko Nakagawa, Kenzo TabuchiAbstract:The initial rate of polymerization was found to be proportional to the fed quantity of Tetrabutylammonium Chloride and square root of the fed quantity of Na 2 S 2 O 4 and CCl 4 . A cyclic phase transfer initiation mechanism was proposed to account for the experimental data.
Ryo Ohmura - One of the best experts on this subject based on the ideXlab platform.
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Thermal conductivity measurements of semiclathrate hydrates and aqueous solutions of Tetrabutylammonium bromide (TBAB) and Tetrabutylammonium Chloride (TBAC) by the transient hot-wire using parylene-coated probe
Fluid Phase Equilibria, 2016Co-Authors: Kyosuke Fujiura, Ryo Ohmura, Yu Nakamoto, Yoshihiro Taguchi, Yuji NagasakaAbstract:The thermal conductivity of semiclathrate hydrates and aqueous solutions of Tetrabutylammonium bromide (TBAB) and Tetrabutylammonium Chloride (TBAC) was measured for the first time in the temperature range from 223 to 303 K under atmospheric pressure. A transient hot-wire apparatus using a parylene-coated probe was employed for the measurements with an uncertainty of ±0.7%. The experimental results indicate that the thermal conductivity of two semiclathrate hydrates are smaller than those of two clathrate hydrates—about 80% of the THF hydrate and 60% of the CH4 hydrate—and are about a factor of 5.5 lower than that of ice Ih at temperatures near the melting point. In addition, the temperature coefficient of the thermal conductivity of semiclathrate hydrate show a weak negative, and the thermal conductivity is more sensitive to the molar mass of a guest molecule.
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phase equilibrium of ionic semiclathrate hydrates formed with Tetrabutylammonium bromide and Tetrabutylammonium Chloride
Fluid Phase Equilibria, 2013Co-Authors: Kai Sato, Hiroki Tokutomi, Ryo OhmuraAbstract:This paper reports the accurate phase equilibrium measurements of two ionic semiclathrate hydrates with Tetrabutylammonium bromide (TBAB) and Tetrabutylammonium Chloride (TBAC). These ionic semiclathrate hydrates are suggested as cool energy storage media for air-conditioning system since their dissociation heats of phase transitions are as large as 200–500 kJ/kg and they form at 278–293 K under atmospheric pressure. Tetrabutylammonium bromide and Tetrabutylammonium Chloride form ionic semiclathrate hydrates and there are several previous reports of the equilibrium temperatures of these hydrates in the literature. However, there is inconsistency in the literature data of equilibrium temperatures. Also, there are no clear notifications of experimental procedures and uncertainty of measurements in some of the previous reports. Therefore, we have performed accurate measurements of the phase equilibrium of Tetrabutylammonium bromide and Tetrabutylammonium Chloride hydrates and the comparison with the literature data is also made in this paper. The highest equilibrium temperature for Tetrabutylammonium bromide system was 285.9 K at 0.35 < wTBAB < 0.37, where wTBAB denotes the mass fraction of Tetrabutylammonium bromide (or the mole fraction of Tetrabutylammonium bromide, 0.029 < xTBAB < 0.032), under atmospheric pressure. That for Tetrabutylammonium Chloride system was 288.2 K at wTBAC = 0.35, where wTBAC is the mass fraction of Tetrabutylammonium Chloride (or the mole fraction of Tetrabutylammonium Chloride, xTBAC = 0.034), under atmospheric pressure.