scholarly journals Density, Viscosity, and Excess Properties of Ternary Aqueous Mixtures of MDEA + MEA, DMEA + MEA, and DEEA + MEA

Fluids ◽  
2020 ◽  
Vol 5 (1) ◽  
pp. 27
Author(s):  
Sumudu S. Karunarathne ◽  
Dag A. Eimer ◽  
Klaus J. Jens ◽  
Lars E. Øi
Keyword(s):  
Excess Entropy ◽  
Excess Free Energy ◽  
Liquid Mixtures ◽  
Excess Properties ◽  
Primary Amines ◽  
Tertiary Amines ◽  
Aqueous Mixtures ◽  
Free Energy Of Activation ◽  
Entropy Of Activation ◽  
Rate Processes

This study presents the measured densities and viscosities of three ternary aqueous mixtures of tertiary and primary amines. The tertiary amines of n-methyldiethanolamine (MDEA), dimethylethanolamine (DMEA), diethylethanolamine (DEEA), and the primary amine monoethanolamine (MEA) at different concentrations (mass%) were mixed to prepare the liquid mixtures. The excess molar volume VE of the mixtures was analyzed using measured densities to acquire a better understanding of the molecular packing and intermolecular interactions in the mixtures. The excess free energy of activation ∆GE* and excess entropy of activation ∆SE* for viscous flow were determined from the measured viscosities by implementing the theory of rate processes of Eyring. Correlations based on the Redlich–Kister type polynomial were adopted to correlate the excess properties VE and ∆GE* as a function of the amine mole fraction and temperature. The results showed that the correlations were able to represent the measured data with satisfactory accuracies for engineering calculations.

scholarly journals On the reduced Redlich-Kister excess properties for 1,2-dimethoxyethane with propylene carbonate binary mixtures at temperatures (from 298.15 to 318.15) K.

2017 ◽  
Vol 6 (2) ◽  
pp. 33-41 ◽  
Author(s):  
Hanen Salhi ◽  
Shaik Babu ◽  
Nada Al-Eidan ◽  
Nejib H. Mekni ◽  
Noura Omar Al-Otaibi ◽  
...  
Keyword(s):  
Propylene Carbonate ◽  
Specific Interaction ◽  
Activation Parameters ◽  
Liquid Mixtures ◽  
Excess Properties ◽  
Effect Of Temperature ◽  
Present System ◽  
Molar Gibbs Free Energy ◽  
Free Energy Of Activation ◽  
Different Temperatures

Values of excess properties in 1,2-dimethoxyethane + propylene carbonate binary liquid mixtures at different temperatures from experimental density and viscosity values presented in earlier work, were used to test the applicability of the correlative reduced Redlich-Kister functions and the Belda equation, and to reveal eventual specific interaction hidden by the classical treatment of direct excess Redlich-Kister functions. Their correlation ability at different temperatures, and the use of different numbers of parameters, is discussed for the case of limited experimental data. The relative Redlich-Kister functions are important to reduce the effect of temperature and, consequently, to reveal the effects of different types of interactions. Values of limiting excess partial molar volume at infinite dilution deduced from different methods were discussed. Also, the activation parameters and partial molar Gibbs free energy of activation of viscous flow against compositions were investigated. Correlation between the two Arrhenius parameters of viscosity shows the existence of main different behaviors separated by a stabilized structure in a short range of mole fraction in 1,2-dimethoxyethane (0.45 to 0.83). In this context, the correlation Belda equation has also been applied to the present system for thermodynamic properties in order to reveal eventual solute-solvent interaction at high dilution.

scholarly journals Studies on excess molar volumes and viscosity deviations of binary mixtures of household kerosene and premium motor spirit at 303K

2021 ◽  
Vol 12 (2) ◽  
pp. 616-620
Author(s):  
Anderson U. Ezeibe ◽  
Emmanuel C. Nleonu ◽  
Kelechi G. Ubaka ◽  
Nadia Arrousse ◽  
Brandy O. Nleonu
Keyword(s):  
Molar Volume ◽  
Mole Fraction ◽  
Excess Free Energy ◽  
Excess Molar Volumes ◽  
Liquid Mixtures ◽  
Free Energies ◽  
Viscosity Deviation ◽  
Viscosity Deviations ◽  
Free Energy Of Activation ◽  
Severe Penalty

Density and viscosity of binary liquid mixtures of household kerosene (HHK) and premium motor spirit (PMS) were determined over the entire range of mole fraction at 303K. Excess molar volume (VE), molar volume (Vm), Excess Viscosity (ηE), Viscosity deviations (Δη) and excess Gibbs free energies of activation of viscous flow (ΔGE) were calculated. The results obtained shows that excess free energy of activation were all positive over the entire mole fraction. The viscosity deviation shows both negative and positive values. The positive VE obtained in this study shows increase in volume in the binary mixture. This work will help in effective monitoring, detection of adulterated kerosene and subsequent enforcement of severe penalty on such adulteration.

Excess properties for binary liquid mixtures of propionic acid with aniline derivatives

1991 ◽  
Vol 69 (3) ◽  
pp. 369-372 ◽  
Author(s):  
Begoña Garcia ◽  
Rafael Alcalde ◽  
José M. Leal
Keyword(s):  
Propionic Acid ◽  
Dipole Moments ◽  
Specific Interaction ◽  
Liquid Mixtures ◽  
Excess Properties ◽  
Free Energies ◽  
Empirical Parameter ◽  
Excess Viscosities ◽  
Different Temperatures ◽  
Mole Volume

Excess viscosities, excess volumes, and excess free energies of activation for flow of the binary mixtures containing propionic acid with aniline, o-toluidine, o-anisidine, and o-chloroaniline were determined at five different temperatures from density and viscosity measurements. Based on the Regular Solutions Theory, the empirical parameter θ was calculated; this parameter is related to the viscosity, and also denotes the extent of the non-ideality of the system. The results obtained suggest the existence of acid–base interactions, as well as the formation of 1:2 complexes for the three first mixtures, and 2:1 complexes for o-chloro-aniline + propionic acid. The extent of the specific interaction decreases with an increase in the strength of the base, and increases with an increase in the dipole moments. The equatioin [Formula: see text] is proposed for predicting the mole volume of the mixtures, V, at any composition, Xi, as a function of the mole volumes of the pure components, Vi. Key words: binary mixture, excess properties, predicting mole volumes, propionic acid.

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