Volumetric properties of aqueous solutions of mono, and diethylethanolamines at temperatures from 5 to 80 °C II

Densities of aqueous solutions of monoethylethanolamine (MEEA) and diethylethanolamine (DEEA) were measured over the whole range of concentrations at temperatures from 5 to 80 °C. Densities of these systems show different behavior at both lower and higher concentration of ethanolamine. This behavior...

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Bibliographic Details
Published in:Thermochimica acta 2002-04, Vol.386 (2), p.119-126
Main Authors: Lebrette, L., Maham, Y., Teng, T.T., Hepler, L.G., Mather, A.E.
Format: Article
Language:English
Subjects:
Binary aqueous systems
Chemical thermodynamics
Chemistry
Density
Diethylethanolamine
Exact sciences and technology
Excess molar enthalpy
Excess molar volume
General and physical chemistry
Mixtures
Monoethylethanolamine
Partial molar volume
Thermodynamic properties
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Summary:Densities of aqueous solutions of monoethylethanolamine (MEEA) and diethylethanolamine (DEEA) were measured over the whole range of concentrations at temperatures from 5 to 80 °C. Densities of these systems show different behavior at both lower and higher concentration of ethanolamine. This behavior was classified into two zones: at x 2=0.12 for (MEEA+water) and at x 2=0.04 for (DEEA+water) mixtures. It is found that in the low concentration zone the effect of alkyl groups could be shown as:  CH 3> C 2 H 5>2( CH 3)>2( C 2 H 5) The excess molar volumes and excess molar enthalpies of (alkylethanolamine+water) mixtures show similar dependence on the size of the alkyl group present in the alkyethanolamines. The excess molar volumes have the most negative value for the (ethylethanolamine+water) system, while the excess molar enthalpies of the (MEEA+water) system have the more negative value.
ISSN:0040-6031
1872-762X
DOI:10.1016/S0040-6031(01)00813-9