Volumetric properties of (water + diethanolamine) systems

1995 ◽  
Vol 73 (9) ◽  
pp. 1514-1519 ◽  
Author(s):  
Yadollah Maham ◽  
Tjoon T. Teng ◽  
Alan E. Mather ◽  
Loren G. Hepler
Keyword(s):  
Thermal Expansion ◽  
Aqueous Solutions ◽  
Molecular Interactions ◽  
Full Range ◽  
Excess Molar Volumes ◽  
Partial Molar Volumes ◽  
Volumetric Properties ◽  
Molar Volumes ◽  
Organic Systems

Densities of completely miscible (water + methyldiethanolamine) and (water + ethyldiethanolamine) systems have been measured over the full range of compositions at temperatures from 25 to 80 °C. Results of these measurements have been used in calculating excess molar volumes and partial molar volumes of each component. We have also identified different measures of the thermal expansion of these systems and have calculated some of these derivative quantities. The partial molar volumes and their derivatives with respect to temperature provide a basis for extending our understanding of molecular interactions in these (water + organic) systems. Keywords: diethanolamines, excess molar volumes, partial molar volumes, expansivities, aqueous solutions.

scholarly journals Volumetric Properties of Aqueous Solutions of Ethylene Glycols in the Temperature Range of 293.15–318.15 K

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Omer El-Amin Ahmed Adam ◽  
Ammar Hani Al-Dujaili ◽  
Akl M. Awwad
Keyword(s):  
Thermal Expansion ◽  
Aqueous Solutions ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Infinite Dilution ◽  
Partial Molar Volumes ◽  
Volumetric Properties ◽  
Molar Volumes ◽  
Ethylene Glycols ◽  
Increasing Temperature

Densities of aqueous solutions of Ethylene glycol (EG), diethylene glycol (DEG), and triethylene glycol (TEG) were measured at temperatures from 293.15 to 318.15 K and molalities ranging from 0.0488 to 0.5288 mol·kg−1. Volumes of all investigated solutions at a definite temperature were linearly dependent on the solute molality; from this dependence the partial molar volumes at infinite dilution were determined for all solutes. It was found that the partial molar volumes at infinite dilution V-2,0 were concentration independent and slightly increase with increasing temperature. The partial molar volumes at infinite dilution V-2,0 or the limiting apparent molar volumes of ethylene glycols were fitted to a linear equation with the number of oxyethylene groups (n) in the solute molecule. From this equation a constant contribution of the terminal (OH) and the (CH2CH2O) groups to the volumetric properties was obtained. The thermal expansion coefficient (α1,2) for all investigated solutions was calculated at temperatures from 293.15 to 318.15 K. The thermal expansion coefficients for all solutes increase with increasing temperature and molality. Values of (α1,2) were higher than the value of the thermal expansion coefficient of the pure water.

scholarly journals VOLUMETRIC PROPERTIES OF ACRYLONITRILE+ETHANOL MIXTURE OVER TEMPERATURE RANGE FROM (293.15 TO 323.15) K AT AMBIENT PRESSURE

2020 ◽  
Vol 63 (2) ◽  
pp. 32-37
Author(s):  
Heghine H. Ghazoyan
Keyword(s):  
Hydrogen Bonding ◽  
Binary Mixture ◽  
Binary Mixtures ◽  
Ambient Pressure ◽  
Full Range ◽  
Excess Molar Volumes ◽  
Partial Molar Volumes ◽  
The Self ◽  
Volumetric Properties ◽  
Molar Volumes

Densities of binary mixture of acrylonitrile in ethanol have been measured over the full range of compositions at temperatures from 293.15K to 323.15 K at the ambient pressure (87.9 kPa). The volumetric properties such as excess molar volumes, apparent molar volumes, partial molar volumes, excess partial molar volumes, standard partial molar volumes for binary mixture were calculated. Excess molar volumes were described by the Redlich–Kister polynomial equation. The Redlich–Kister coefficients and the standard deviations were calculated as well. The excess molar volumes exhibit mainly negative deviations from the ideal behavior over the whole range of composition for acrylonitrile+ethanol binary mixtures at low temperatures and become less negative with increasing temperature from 293.15 to 323.15 K. The results are interpreted on the basis of strong interaction between group of acrylonitrile and OH group of ethanol by hydrogen bonding. However, the sigmoid shape of plots of excess molar volumes versus molar fraction of ethanol from positive to negative values indicates to the varying interactions depending upon the composition of binary mixtures. Moreover, it is also attributed to the self-associating effect of ethanol therefore the self-associates of acrylonitrile by dipole-dipole interactions and the self-associates of ethanol by hydrogen bonding between same molecules at low concentrations predominate too.

Volumetric Properties of aqueous solutions of Arabinose, Xylose and Galactose in presence / absence of Sodium Cyclamate

2021 ◽  
Vol 25 (7) ◽  
pp. 56-63
Author(s):  
Sanjeevan J. Kharat ◽  
Manisha D. Patil
Keyword(s):  
Aqueous Solutions ◽  
Partial Molar Volumes ◽  
Taste Quality ◽  
Volumetric Properties ◽  
Artificial Sweetener ◽  
Molar Volumes ◽  
Pharmaceutical Industries ◽  
Sodium Cyclamate ◽  
Specific Volumes

Sugars can affect our blood glucose (sugar), weight and blood fats. Synthetic sugars (artificial sweetener) provide little or no calories or carbohydrate or do not increase blood sugar. In food and pharmaceutical industries, blends of sweeteners are commonly used to design the food products and pharmaceutical doses, the information regarding type and extent of sweetener-sweetener and sweetener -water interactions and taste quality of the solution required. The aqueous solutions of arabinose, xylose and galactose with and without cyclamate are studied. Densities of solutions of arabinose, xylose and galactose in presence of 0.05, 0.15 and 0.3 m sodium cyclamate have been measured at 298.15K. Partial molar volumes, apparent specific volumes, partial molar volumes of transfer and doublet and triplet interaction parameters have been calculated. The information obtained from these parameters has been used to understand type and extent of sweetener-sweetener and sweetener -water interactions and taste quality of the solution.

scholarly journals Derived thermodynamic properties of alcohol + cyclohexylamine mixtures

2010 ◽  
Vol 75 (2) ◽  
pp. 283-293 ◽  
Author(s):  
Ivona Radovic ◽  
Mirjana Kijevcanin ◽  
Aleksandar Tasic ◽  
Bojan Djordjevic ◽  
Slobodan Serbanovic
Keyword(s):  
Thermal Expansion ◽  
Infinite Dilution ◽  
Binary Systems ◽  
Excess Molar Volumes ◽  
Partial Molar Volumes ◽  
Hydroxyl Group ◽  
Molar Volumes ◽  
Thermal Expansion Coefficients ◽  
Expansion Coefficients ◽  
Partial Excess Molar Volumes

Thermal expansion coefficients, ?, excess thermal expansion coefficients, ?E, isothermal coefficients of pressure excess molar enthalpy, (?HE/?p)T,x, partial molar volumes, V?i, partial molar volumes at infinite dilution, V?i?, partial excess molar volumes, V?Ei, and partial excess molar volumes at infinite dilution, V?Ei?, were calculated using experimental densities and excess molar volumes, VE, data. All calculations are performed for the binary systems of cyclohexylamine with 1-propanol or 1-butanol or 2-butanol or 2-methyl-2-propanol. The Redlich-Kister polynomial and the reduced excess molar volume approach were used in the evaluation of these properties. In addition, the aim of this investigation was to provide a set of various volumetric data in order to asses the influence of temperature, chain length and position of hydroxyl group in the alcohol molecule on the molecular interactions in the examined binary mixtures.

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