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Bijan Das - One of the best experts on this subject based on the ideXlab platform.
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viscosities of tetrabutylammonium Bromide Sodium tetraphenylborate and Sodium Bromide in 2 ethoxyethanol water mixed solvent media at 308 15 313 15 318 15 and 323 15 k
Journal of Molecular Liquids, 2008Co-Authors: Purushottam Haldar, Bijan DasAbstract:Abstract The viscosities of the solutions of tetrabutylammonium Bromide (Bu4NBr), Sodium tetraphenylborate (NaBPh4), Sodium Bromide (NaBr) in 2-ethoxyethanol + water mixed solvent media containing 0.25, 0.50 and 0.75 mass fractions of 2-ethoxyethanol (w1) have been reported at 308.15, 313.15, 318.15, and 323.15 K. The viscosity data have been analyzed by the Jones–Dole equation for the associated electrolytes to evaluate the viscosity B-coefficients of the electrolytes. These data have also been analyzed by the transition-state treatment to obtain contribution of the solutes to the free energy of activation for viscous flow of the solution. The viscosity of the solvent is found to be greatly modified by the presence of the tetrabutylammonium, tetraaphenylborate and Bromide ions; Sodium ion, on the other hand, is not such efficient in modifying the viscosity of the media investigated. Moreover, these ions behave neither as structure-breaker nor as structure-maker and the formation of the transition-state is made less favorable in their presence in aqueous 2-ethoxyethanol solutions.
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electrical conductances of Sodium Bromide and Sodium tetraphenylborate in 2 ethoxyethanol water mixtures at 308 15 313 15 318 15 and 323 15 k
Journal of Molecular Liquids, 2007Co-Authors: Purushottam Haldar, Bijan DasAbstract:Abstract The electrical conductances of the solutions of Sodium Bromide (NaBr) and Sodium tetraphenylborate (NaBPh 4 ) in 2-ethoxyethanol + water mixed solvent media containing 0.25, 0.50 and 0.75 mass fractions of 2-ethoxyethanol ( w 1 ) have been reported at 308.15, 313.15, 318.15, and 323.15 K. The conductance data have been analyzed by the 1978 Fuoss conductance–concentration equation in terms of the limiting molar conductance ( Λ 0 ), the association constant ( K A ) and the association diameter ( R ). Of the two electrolytes investigated here, Sodium Bromide exists essentially in the form of free ions in aqueous 2-ethoxyethanol solutions over the entire temperature range investigated. However, slight ionic association was observed for Sodium tetraphenylborate—the extent of which increases with increasing amount of 2-ethoxyethanol in the present mixed solvent media. The solvations of the Bromide ion and of the Sodium ion were found to be gradually weakened as the 2-ethoxyethanol content of the medium increases. Furthermore, the limiting molar conductivity values of the two electrolytes increase as the temperature increases in all 2-ethoxyethanol + water mixtures which have been described by polynomial equations.
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electrical conductances of tetrabutylammonium Bromide Sodium tetraphenylborate and Sodium Bromide in ethylene glycol 1 water 2 mixtures at 298 15 303 15 308 15 and 318 15 k
Journal of Chemical & Engineering Data, 2004Co-Authors: Ramesh Sharma, Chanchal Das, Amritendu Chatterjee, Bijan DasAbstract:The electrical conductances of the solutions of tetrabutylammonium Bromide (Bu4NBr), Sodium tetraphenylborate (NaBPh4), and Sodium Bromide (NaBr) in methanol (1) + water (2) mixed solvent media containing 0.10, 0.20, and 0.30 volume fractions of methanol have been reported at (298.15, 308.15, and 318.15) K. The conductance data have been analyzed by the 1978 Fuoss conductance−concentration equation in terms of the limiting molar conductance (Λ0), the association constant (KA), and the association diameter (R). The ionic contributions to the limiting molar conductance have been estimated using tetrabutylammonium tetraphenylborate (Bu4NBPh4) as the “reference electrolyte”. All of these three electrolytes are found to exist as free ions in the present solvent mixtures within the temperature range (298.15 to 318.15) K. Besides the relative permittivity and the viscosity of the media, specific interactions of the ions with the solvent media have been found to play a profound influence on their mobilities. Alth...
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electrical conductances of tetrabutylammonium Bromide Sodium tetraphenylborate and Sodium Bromide in 2 ethoxyethanol in the temperature range 35 50 c
Zeitschrift für Physikalische Chemie, 2004Co-Authors: Purushottam Haldar, Bijan DasAbstract:The electrical conductances of the solutions of tetrabutylammonium Bromide (Bu 4 NBr), Sodium tetraphenylborate (NaPh 4 B) and Sodium Bromide (NaBr) in 2-ethoxyethanol have been reported at 35, 40, 45 and 50°C. The conductance data have been analyzed by the 1978 Fuoss conductance-concentration equation in terms of the limiting molar conductance (Λ 0 ), the association constant (K Λ ) and the association diameter (R). The ionic contributions to the limiting molar conductances (Λ 0 ) have been estimated using the "reference electrolyte" tetrabutylammonium tetraphenylborate (Bu 4 NPh 4 B). Appreciable ionic association was observed for all of these electrolytes which were found to exist in the form of solvent-separated ion-pairs in 2-ethoxyethanol. The tetrabutylammonium and tetraphenylborate ions are found to remain scarcely solvated whereas the Sodium and Bromide ions undergo substantial solvation in 2-ethoxyethanol medium in the temperature range investigated here.
Adam Bald - One of the best experts on this subject based on the ideXlab platform.
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conductance studies of nacl kcl nabr kbr bu4nbr and nabph4 in water 2 methoxyethanol mixtures at 298 15 k
Journal of Molecular Liquids, 2013Co-Authors: Adam Bald, Zdzislaw Kinart, Anna Wypychstasiewicz, Renato TomasAbstract:Abstract The electrical conductance of the solutions of Sodium chloride (NaCl), potassium chloride (KCl), Sodium Bromide (NaBr), potassium Bromide (KBr), tetrabutylammonium Bromide (Bu 4 NBr) and Sodium tetraphenylborate (NaBPh 4 ) in water + 2-methoxyethanol binary mixtures at T = 298.15 K has been reported. The experimental data of conductance have been analyzed on the base of low concentration chemical model (lcCM). The individual ionic conductivities of Na + , K + , Bu 4 N + , Cl − , Br − and BPh 4 − ions have been determined using the Fuoss–Hirsch assumption. The dependencies of the values of limiting molar conductance ( Λ 0 ), limiting ionic conductance of the individual anions ( λ o ± ) and Walden products ( Λ 0 ⋅ η and λ o ± ⋅ η ) as a function of composition of water + 2-methoxyethanol binary mixtures have been discussed.
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conductance studies of nacl kcl nabr nai nabph4 bu4ni and naclo4 in water 2 butoxyethanol mixtures at t 298 15 k
Journal of Chemical & Engineering Data, 2010Co-Authors: Agnieszka Borun, Anna Florczak, Adam BaldAbstract:The electrical conductances of solutions of Sodium chloride (NaCl), potassium chloride (KCl), Sodium Bromide (NaBr), Sodium iodide (NaI), Sodium tetraphenylborate (NaBPh4), tetrabutylammonium iodide (Bu4NI), and Sodium perchlorate (NaClO4) in water (1) + 2-butoxyethanol (2) mixtures containing (0.01, 0.025, 0.05, 0.075, 0.10, 0.15, and 0.20) mole fractions of 2-butoxyethanol have been measured at T = 298.15 K. The conductance data have been analyzed by the Fuoss−Justice equation. The individual limiting ionic conductivities of Na+, K+, Bu4N+, BPh4−, I−, Cl−, Br−, and ClO4− ions have been determined using the Fuoss−Hirsch assumption. The dependencies of the limiting molar conductances, Λo, and Walden products, Λoη, versus mixed solvent composition have been discussed.
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conductance studies of nacl kcl nabr nai nabph4 and bu4ni in water 2 ethoxyethanol mixtures at 298 15 k
Journal of Chemical & Engineering Data, 2010Co-Authors: Agnieszka Borun, Anna Florczak, Adam BaldAbstract:The electrical conductances of solutions of Sodium chloride (NaCl), potassium chloride (KCl), Sodium Bromide (NaBr), Sodium iodide (NaI), Sodium tetraphenylborate (NaBPh4), and tetrabutylammonium iodide (Bu4NI) in water (1) + 2-ethoxyethanol (2) mixtures containing (0.01, 0.025, 0.05, 0.075, 0.10, 0.15, and 0.20) mol fractions of 2-ethoxyethanol have been measured at 298.15 K. The conductance data have been analyzed by the Fuoss−Justice equation. The individual limiting ionic conductivities of Na+, K+, Bu4N+, BPh4−, I−, Cl−, and Br− ions have been determined using the Fuoss−Hirsch assumption. The dependencies of the limiting molar conductances, Λo, and Walden products, Λoη, versus mixed solvent composition have been discussed.
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conductance studies of nacl kcl nabr nai nabph4 bu4ni and naclo4 in water 2 methoxyethanol mixtures at 298 15 k
Journal of Molecular Liquids, 2009Co-Authors: Agnieszka Borun, Anna Florczak, Adam BaldAbstract:Abstract The electrical conductances of the solutions of Sodium chloride (NaCl), potassium chloride (KCl), Sodium Bromide (NaBr), Sodium iodide (NaI), Sodium tetraphenylborate (NaBPh 4 ), tetrabutylammonium iodide (Bu 4 NI) and Sodium perchlorate (NaClO 4 ) in water (1) + 2-methoxyethanol (2) mixtures containing 0.01, 0.025, 0.05, 0.075, 0.10, 0.15 and 0.20 mol fractions of 2-methoxyethanol have been reported at 298.15 K. The conductance data have been analyzed by the Fuoss–Justice equation. The individual limiting ionic conductivities of Na + , K + , Bu 4 N + , BPh 4 − , I − , Cl − , and Br − ions have been determined using the Fuoss–Hirsch assumption. The dependencies of the limiting molar conductances, Λ o , and Walden products, Λ o η , versus mixed solvent composition have been discussed.
Yanxi Wei - One of the best experts on this subject based on the ideXlab platform.
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comparative study on the treatment of simulated brominated butyl rubber wastewater by using bipolar membrane electrodialysis bmed and conventional electrodialysis ed
Separation and Purification Technology, 2013Co-Authors: Yanxi Wei, Yaoming Wang, Xu ZhangAbstract:Abstract A large amount of wastewater containing Sodium Bromide (NaBr) is generated during the production of brominated butyl rubber. In our previous job, bipolar membrane electrodialysis (BMED) was used to regenerate hydrobromic acid (HBr) and Sodium hydroxide (NaOH) from a simulated NaBr wastewater. To give a comparison with previously presented research paper, a desalinization of Sodium Bromide by using ED was also performed. The effects of operation parameters, such as current density, Sodium Bromide concentration, and initial acid and base concentrations in the concentrate, on desalinization were analyzed. In comparison, BMED has higher desalinization ratio and current efficiency, and much lower voltage drop and energy consumption. The process cost is estimated to be 0.82 $/kg NaBr for BMED and 1.01 $/kg NaBr for ED. Notably, BMED can also regenerate NaOH and HBr. Therefore, BMED will be more economically attractive and environmental benignity due to the regeneration of useful resource and prevention of secondary pollution.
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treatment of simulated brominated butyl rubber wastewater by bipolar membrane electrodialysis
Separation and Purification Technology, 2011Co-Authors: Yanxi Wei, Yaoming Wang, Xu ZhangAbstract:Abstract A large amount of wastewaters containing Sodium Bromide (NaBr) is usually generated during the production of brominated butyl rubber; it can cause contamination of the environment. In this study, a method was reported to regenerate hydrobromic acid (HBr) and Sodium hydroxide (NaOH) from a simulated NaBr wastewater by bipolar membrane electrodialysis (BMED). Sodium hydroxide may be recycled in the neutralization washing process of preparing the brominated butyl rubber. The effects of operation parameters, such as Sodium Bromide concentration, current density, and initial acid and base concentrations, on regeneration were analyzed, on the basis of proper energy consumption and current efficiency. The results indicated that a low energy consumption and a high current efficiency were achieved when the concentration of Sodium Bromide was in the range of 11,000–16,000 mg/L with both the initial concentration of the acid and base at about 0.10 mol/L. Additionally, it was also demonstrated that a high current density applied to the BMED stack usually resulted in both higher energy consumption and current efficiency. Finally, a discharged NaBr concentration of 133.9 mg/L, which was far below the discharge standard of water pollutants for industry, could be obtained from the initial concentration of 16,000 mg/L after the operation of BMED process for 3.5 h. Therefore, this process cannot only achieve the elimination of environmental pollution, but also the recycling of resources.
Purushottam Haldar - One of the best experts on this subject based on the ideXlab platform.
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viscosities of tetrabutylammonium Bromide Sodium tetraphenylborate and Sodium Bromide in 2 ethoxyethanol water mixed solvent media at 308 15 313 15 318 15 and 323 15 k
Journal of Molecular Liquids, 2008Co-Authors: Purushottam Haldar, Bijan DasAbstract:Abstract The viscosities of the solutions of tetrabutylammonium Bromide (Bu4NBr), Sodium tetraphenylborate (NaBPh4), Sodium Bromide (NaBr) in 2-ethoxyethanol + water mixed solvent media containing 0.25, 0.50 and 0.75 mass fractions of 2-ethoxyethanol (w1) have been reported at 308.15, 313.15, 318.15, and 323.15 K. The viscosity data have been analyzed by the Jones–Dole equation for the associated electrolytes to evaluate the viscosity B-coefficients of the electrolytes. These data have also been analyzed by the transition-state treatment to obtain contribution of the solutes to the free energy of activation for viscous flow of the solution. The viscosity of the solvent is found to be greatly modified by the presence of the tetrabutylammonium, tetraaphenylborate and Bromide ions; Sodium ion, on the other hand, is not such efficient in modifying the viscosity of the media investigated. Moreover, these ions behave neither as structure-breaker nor as structure-maker and the formation of the transition-state is made less favorable in their presence in aqueous 2-ethoxyethanol solutions.
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electrical conductances of Sodium Bromide and Sodium tetraphenylborate in 2 ethoxyethanol water mixtures at 308 15 313 15 318 15 and 323 15 k
Journal of Molecular Liquids, 2007Co-Authors: Purushottam Haldar, Bijan DasAbstract:Abstract The electrical conductances of the solutions of Sodium Bromide (NaBr) and Sodium tetraphenylborate (NaBPh 4 ) in 2-ethoxyethanol + water mixed solvent media containing 0.25, 0.50 and 0.75 mass fractions of 2-ethoxyethanol ( w 1 ) have been reported at 308.15, 313.15, 318.15, and 323.15 K. The conductance data have been analyzed by the 1978 Fuoss conductance–concentration equation in terms of the limiting molar conductance ( Λ 0 ), the association constant ( K A ) and the association diameter ( R ). Of the two electrolytes investigated here, Sodium Bromide exists essentially in the form of free ions in aqueous 2-ethoxyethanol solutions over the entire temperature range investigated. However, slight ionic association was observed for Sodium tetraphenylborate—the extent of which increases with increasing amount of 2-ethoxyethanol in the present mixed solvent media. The solvations of the Bromide ion and of the Sodium ion were found to be gradually weakened as the 2-ethoxyethanol content of the medium increases. Furthermore, the limiting molar conductivity values of the two electrolytes increase as the temperature increases in all 2-ethoxyethanol + water mixtures which have been described by polynomial equations.
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electrical conductances of tetrabutylammonium Bromide Sodium tetraphenylborate and Sodium Bromide in 2 ethoxyethanol in the temperature range 35 50 c
Zeitschrift für Physikalische Chemie, 2004Co-Authors: Purushottam Haldar, Bijan DasAbstract:The electrical conductances of the solutions of tetrabutylammonium Bromide (Bu 4 NBr), Sodium tetraphenylborate (NaPh 4 B) and Sodium Bromide (NaBr) in 2-ethoxyethanol have been reported at 35, 40, 45 and 50°C. The conductance data have been analyzed by the 1978 Fuoss conductance-concentration equation in terms of the limiting molar conductance (Λ 0 ), the association constant (K Λ ) and the association diameter (R). The ionic contributions to the limiting molar conductances (Λ 0 ) have been estimated using the "reference electrolyte" tetrabutylammonium tetraphenylborate (Bu 4 NPh 4 B). Appreciable ionic association was observed for all of these electrolytes which were found to exist in the form of solvent-separated ion-pairs in 2-ethoxyethanol. The tetrabutylammonium and tetraphenylborate ions are found to remain scarcely solvated whereas the Sodium and Bromide ions undergo substantial solvation in 2-ethoxyethanol medium in the temperature range investigated here.
Agnieszka Borun - One of the best experts on this subject based on the ideXlab platform.
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conductance studies of nacl kcl nabr nai nabph4 bu4ni and naclo4 in water 2 butoxyethanol mixtures at t 298 15 k
Journal of Chemical & Engineering Data, 2010Co-Authors: Agnieszka Borun, Anna Florczak, Adam BaldAbstract:The electrical conductances of solutions of Sodium chloride (NaCl), potassium chloride (KCl), Sodium Bromide (NaBr), Sodium iodide (NaI), Sodium tetraphenylborate (NaBPh4), tetrabutylammonium iodide (Bu4NI), and Sodium perchlorate (NaClO4) in water (1) + 2-butoxyethanol (2) mixtures containing (0.01, 0.025, 0.05, 0.075, 0.10, 0.15, and 0.20) mole fractions of 2-butoxyethanol have been measured at T = 298.15 K. The conductance data have been analyzed by the Fuoss−Justice equation. The individual limiting ionic conductivities of Na+, K+, Bu4N+, BPh4−, I−, Cl−, Br−, and ClO4− ions have been determined using the Fuoss−Hirsch assumption. The dependencies of the limiting molar conductances, Λo, and Walden products, Λoη, versus mixed solvent composition have been discussed.
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conductance studies of nacl kcl nabr nai nabph4 and bu4ni in water 2 ethoxyethanol mixtures at 298 15 k
Journal of Chemical & Engineering Data, 2010Co-Authors: Agnieszka Borun, Anna Florczak, Adam BaldAbstract:The electrical conductances of solutions of Sodium chloride (NaCl), potassium chloride (KCl), Sodium Bromide (NaBr), Sodium iodide (NaI), Sodium tetraphenylborate (NaBPh4), and tetrabutylammonium iodide (Bu4NI) in water (1) + 2-ethoxyethanol (2) mixtures containing (0.01, 0.025, 0.05, 0.075, 0.10, 0.15, and 0.20) mol fractions of 2-ethoxyethanol have been measured at 298.15 K. The conductance data have been analyzed by the Fuoss−Justice equation. The individual limiting ionic conductivities of Na+, K+, Bu4N+, BPh4−, I−, Cl−, and Br− ions have been determined using the Fuoss−Hirsch assumption. The dependencies of the limiting molar conductances, Λo, and Walden products, Λoη, versus mixed solvent composition have been discussed.
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conductance studies of nacl kcl nabr nai nabph4 bu4ni and naclo4 in water 2 methoxyethanol mixtures at 298 15 k
Journal of Molecular Liquids, 2009Co-Authors: Agnieszka Borun, Anna Florczak, Adam BaldAbstract:Abstract The electrical conductances of the solutions of Sodium chloride (NaCl), potassium chloride (KCl), Sodium Bromide (NaBr), Sodium iodide (NaI), Sodium tetraphenylborate (NaBPh 4 ), tetrabutylammonium iodide (Bu 4 NI) and Sodium perchlorate (NaClO 4 ) in water (1) + 2-methoxyethanol (2) mixtures containing 0.01, 0.025, 0.05, 0.075, 0.10, 0.15 and 0.20 mol fractions of 2-methoxyethanol have been reported at 298.15 K. The conductance data have been analyzed by the Fuoss–Justice equation. The individual limiting ionic conductivities of Na + , K + , Bu 4 N + , BPh 4 − , I − , Cl − , and Br − ions have been determined using the Fuoss–Hirsch assumption. The dependencies of the limiting molar conductances, Λ o , and Walden products, Λ o η , versus mixed solvent composition have been discussed.