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Ryo Ohmura - One of the best experts on this subject based on the ideXlab platform.
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phase equilibrium for structure ii clathrate hydrates formed with fluoromethane propan 2 ol 2 methyl 2 propanol or 2 propanone
The Journal of Chemical Thermodynamics, 2012Co-Authors: Masatoshi Imai, Shinnosuke Nitta, Satoshi Takeya, Ryo OhmuraAbstract:Abstract This paper presents phase-equilibrium pressure–temperature data for the clathrate hydrates formed in the three component systems each consisting of a hydrate-forming gas, a water-soluble freezing-point depression material, and water. These systems are {fluoromethane (CH 3 F) + Propan-2-Ol + water}, (fluoromethane + 2-methyl-2-propanol + water), and (fluoromethane + 2-propanone + water). The mole ratio of water and the water-soluble material (papan-2-ol, 2-methyl-2-propanol, or 2-propanone) was 17:1. The temperature range over which the phase-equilibrium measurements were performed extended to 267.6 K on the lower side and 295.8 K on the higher side. The phase-equilibrium pressures in these three systems were found to be lower than that in the binary (fluoromethane + water) system at a given system temperature. The crystallographic structure of the hydrates formed in the systems with 2-methyl-2-propanol and 2-propanone was determined to be structure II based on the powder X-ray diffraction measurements.
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phase equilibrium for clathrate hydrates formed with difluoromethane or krypton each coexisting with propan 2 ol 2 methyl 2 propanol or 2 propanone
Journal of Chemical & Engineering Data, 2007Co-Authors: Shuntaro Imai, Ryo Ohmura, Kumiko Miyake, Yasuhiko H MoriAbstract:This paper presents phase-equilibrium pressure−temperature data for the clathrate hydrates formed in six three-component systems each consisting of a hydrate-forming gas, a water-soluble freezing-point depression material, and water. These systems are difluoromethane + Propan-2-Ol + water, difluoromethane + 2-methyl-2-propanol + water, difluoromethane + 2-propanone + water, krypton + Propan-2-Ol + water, krypton + 2-methyl-2-propanol + water, and krypton + 2-propanone + water. The temperature range over which the phase-equilibrium measurements were performed using each system extended to (268.65 to 266.75) K on the lower side and (284.05 to 293.35) K on the higher side. The phase-equilibrium temperatures in the three difluoromethane-containing systems were found to be lower than that in the binary difluoromethane + water system at the same system pressure above 0.2 MPa at which the equilibrium temperature in the binary system is nearly 275 K. On the contrary, the phase-equilibrium temperatures in the thre...
Mehdi Hasan - One of the best experts on this subject based on the ideXlab platform.
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solubility density and solution thermodynamics of nai in different pure solvents and binary mixtures
Journal of Chemical & Engineering Data, 2012Co-Authors: Ramesh R Pawar, Chandrakant S Aher, Jitendra D Pagar, Sonali L Nikam, Mehdi HasanAbstract:Solubility of NaI in water, methanol, ethanol, Propan-2-Ol, and also in water + methanol, water + ethanol, and water + Propan-2-Ol binary mixtures have been experimentally measured using a gravimetric method at temperatures (298.15.303.15, 308.15, and 313.15) K. The combined NIBS (nearly ideal binary solvent)–Redlic–Kister equation is used to fit experimental solubility data at constant temperature. The densities of the saturated solutions are also reported in pure and binary solvent mixtures at temperatures mentioned above. Thermodynamic functions including ΔHsoln0, ΔGsoln0, and ΔSsoln0 of solution of NaI are obtained from the modified van’t Hoff equation. A comparison of the relative contributions by enthalpy (ζH) and entropy (ζTS) is made which indicated that the main contributor to the positive standard molar Gibbs energy of solution of NaI is the entropy for solution of NaI in water + methanol having xC0 < 0.5 and for all other solutions it is enthalpy.
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densities and viscosities of binary mixtures of toluene with methanol ethanol propan 1 ol butan 1 ol pentan 1 ol and 2 methylpropan 2 ol at 303 15 308 15 313 15 k
Journal of Chemical & Engineering Data, 2000Co-Authors: Pandharinath S Nikam, Bapu S Jagdale, And Arun B Sawant, Mehdi HasanAbstract:Densities and viscosities of the binary mixtures of toluene with methanol, ethanol, propan-1-ol, butan-1-ol, pentan-1-ol, and 2-methylPropan-2-Ol have been measured at 303.15, 308.15, and 313.15 K. From these data, excess molar volumes (VE) and deviations in viscosity (Δη) have been calculated. These results are fitted to Redlich−Kister type polynomial equations to estimate the binary coefficients and standard errors.
Arezoo Omidi - One of the best experts on this subject based on the ideXlab platform.
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excess molar enthalpies of ethane 1 2 diamine plus primary and secondary alkanols c1 c4 and correlation with redlich kister wilson nrtl and uniquac models at t 298 k
The Journal of Chemical Thermodynamics, 2017Co-Authors: Hosseinali Zarei, Foad Bohloor, Arezoo OmidiAbstract:Abstract Excess molar enthalpies, H m E of binary mixtures of ethane-1,2-diamine (EDA) with methanol, ethanol, propan-1-ol, Propan-2-Ol, butan-1-ol and butan-2-ol were calculated from calorimetric data at T = 298 K and atmospheric pressure (81.5 kPa) with a Parr 1455 solution calorimeter. All the binary mixtures showed exothermic behavior over the entire range of compositions. From the experimental results, the excess partial molar enthalpies, H i E and excess partial molar enthalpies at infinite dilution, H i E , ∞ were calculated. Excess molar enthalpies, H m E values increase as the chain length of the alkanol is increased, showing minimum values varying from −4395 (methanol) to −1987 J · mol - 1 (butan-2-ol). The minimum H m E values were observed about 0.4 mol fraction of ethane-1,2-diamine (EDA). The experimental results were discussed in terms of intermolecular interactions, particularly hydrogen-bonding interactions between like and unlike molecules. Finally the experimental results were correlated by the Redlich–Kister equation and the three thermodynamic models (Wilson, NRTL, and UNIQUAC) based on the local composition theory.
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experimental study on the calorimetric data of 2 butoxyethanol with aliphatic alcohols c1 c4 and correlation with the wilson nrtl and uniquac models at t 298 k
The Journal of Chemical Thermodynamics, 2016Co-Authors: Hosseinali Zarei, Arezoo OmidiAbstract:Abstract Excess molar enthalpies, H m E of binary mixtures of 2-butoxyethanol with methanol, ethanol, propan-1-ol, Propan-2-Ol, butan-1-ol and butan-2-ol were calculated from calorimetric data at T = 298 K and ambient pressure (81.5 kPa). Calorimetric measurements were performed with employing a Parr 1455 solution calorimeter in an isolated room. All the binary mixtures showed endothermic behavior except 2-butoxyethanol + methanol mixture which showed exothermic behavior over the entire range of compositions. The experimental data were then used to calculate excess partial molar enthalpies, H i E and excess partial molar enthalpies at infinite dilution, H i E , ∞ . The maximum H m E values were observed about 0.45–0.5 mol fraction of 2-butoxyethanol. H m E increases as the length and the branch chains of the alcohols increase. Finally, the experimental results were correlated by using the Redlich–Kister equation and three thermodynamic models (Wilson, NRTL, and UNIQUAC) based on the local composition theory.
Yasuhiko H Mori - One of the best experts on this subject based on the ideXlab platform.
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phase equilibrium for clathrate hydrates formed with difluoromethane or krypton each coexisting with propan 2 ol 2 methyl 2 propanol or 2 propanone
Journal of Chemical & Engineering Data, 2007Co-Authors: Shuntaro Imai, Ryo Ohmura, Kumiko Miyake, Yasuhiko H MoriAbstract:This paper presents phase-equilibrium pressure−temperature data for the clathrate hydrates formed in six three-component systems each consisting of a hydrate-forming gas, a water-soluble freezing-point depression material, and water. These systems are difluoromethane + Propan-2-Ol + water, difluoromethane + 2-methyl-2-propanol + water, difluoromethane + 2-propanone + water, krypton + Propan-2-Ol + water, krypton + 2-methyl-2-propanol + water, and krypton + 2-propanone + water. The temperature range over which the phase-equilibrium measurements were performed using each system extended to (268.65 to 266.75) K on the lower side and (284.05 to 293.35) K on the higher side. The phase-equilibrium temperatures in the three difluoromethane-containing systems were found to be lower than that in the binary difluoromethane + water system at the same system pressure above 0.2 MPa at which the equilibrium temperature in the binary system is nearly 275 K. On the contrary, the phase-equilibrium temperatures in the thre...
Jagadish G Baragi - One of the best experts on this subject based on the ideXlab platform.
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physico chemical and excess properties of the binary mixtures of methylcyclohexane ethanol propan 1 ol propan 2 ol butan 1 ol 2 methyl 1 propanol or 3 methyl 1 butanol at t 298 15 303 15 and 308 15 k
The Journal of Chemical Thermodynamics, 2006Co-Authors: Mrityunjaya I Aralaguppi, Jagadish G BaragiAbstract:Abstract Physico-chemical properties viz., density, viscosity, and refractive index at temperatures = (298.15, 303.15, and 308.15) K and the speed of sound at T = 298.15 K are measured for the binary mixtures of methylcyclohexane with ethanol, propan1-ol, Propan-2-Ol, butan-1-ol, 2-methyl-1-propanol, and 3-methyl-1-butanol over the entire range of mixture composition. From these data, excess molar volume, deviations in viscosity, molar refraction, speed of sound, and isentropic compressibility have been calculated. These results are fitted to the polynomial equation to derive the coefficients and standard errors. The experimental and calculated quantities are used to study the nature of mixing behaviours between the mixture components.
