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Thermodynamics of Viscous Flow of tert-Butanol with Butylamines: UNIFAC–VISCO, Grunberg–Nissan and McAllister Three Body Interaction Models for Viscosity Prediction and Quantum Chemical (DFT) Calculations


Thermodynamic activation parameters, enthalpies (ΔH ), entropies (ΔS ) and Gibbs energies (ΔG ) for viscous flow of the systems tert-butanol (TB)+n-butylamine (NBA), TB+di-n-butylamine (DBA) and TB+tri-n-butylamine (TBA) have been calculated from measured density and viscosity data at temperatures ranging from 303.l5 to 323.15 K over the composition range 0 ≤ x 2 ≤ 1, where x 2 is the mole fraction of TB. For all systems, the corresponding excess properties ΔH ‡E, ΔS ‡E and ΔG ‡E have been determined, which are negative in the whole range of composition. The observed negative excess activation properties have been accounted for in terms of dispersive forces and H-bonding. The derived properties are well represented by fourth degree polynomial equations whereas the excess properties could be fitted to third degree Redlich–Kister polynomial equations. Furthermore, the viscosities have been predicted by using the UNIFAC–VISCO model, Grunberg–Nissan model and McAllister three-body interaction model. The UNIFAC–VISCO model and Grunberg–Nissan model do not show good agreement with the experimental data, whereas the McAllister three-body interaction model shows excellent agreement for all three systems, with small average absolute percent deviations (AAD% = 0.6–2.3). The DFT-B3LYP method with the 6-311 G (d, p) basis set has been employed for the optimization of the geometry and calculation of the total energies of the pure compounds and their binary complexes.

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The authors gratefully acknowledge the financial grant from the Ministry of Science, Information and Communication Technology, Government of the People’s Republic of Bangladesh, for the project “Physical Properties and Molecular Interactions in Liquid Systems” and the Department of Chemistry, University of Chittagong, Bangladesh. Additionally, we acknowledge the support from the University of Malaya through UMRG Grant No. RG375-15AFR.

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Correspondence to Faisal I. Chowdhury or A. K. Arof.

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Chowdhury, F.I., Khandaker, M.U., Zabed, H. et al. Thermodynamics of Viscous Flow of tert-Butanol with Butylamines: UNIFAC–VISCO, Grunberg–Nissan and McAllister Three Body Interaction Models for Viscosity Prediction and Quantum Chemical (DFT) Calculations. J Solution Chem 46, 1104–1120 (2017).

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  • Thermodynamic activation parameter
  • UNIFAC–VISCO model
  • Grunberg–Nissan model
  • McAllister three-body interaction model
  • Density functional theory (DFT)