Activity coefficient at infinite dilution measurements for organic solutes (polar and non-polar) in fatty compounds – Part II: C18 fatty acids
In this work, activity coefficients at infinite dilution (c113) have been measured for 21 solutes (subscript 1) (alkanes, cycloalkanes, alkenes, aromatic compounds, alcohols, esters, ketones, and halogenated hydro carbons), in four solvents (subscript 3), namely one saturated fatty acid and three un...
Na minha lista:
| Principais autores: | , , , , , |
|---|---|
| Formato: | article |
| Idioma: | English |
| Publicado em: |
Elsevier
|
| Assuntos: | |
| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/44979 |
| Tags: |
Adicionar Tag
Sem tags, seja o primeiro a adicionar uma tag!
|
| Resumo: | In this work, activity coefficients at infinite dilution (c113) have been measured for 21 solutes (subscript 1) (alkanes, cycloalkanes, alkenes, aromatic compounds, alcohols, esters, ketones, and halogenated hydro carbons), in four solvents (subscript 3), namely one saturated fatty acid and three unsaturated fatty acids:
stearic (octadecanoic) acid – C18:0, oleic (cis-9-octadecenoic) acid – C18:1 9c, linoleic (cis,cis-9,12- octadecadienoic) acid – C18:2 9c12c, and linolenic (cis,cis,cis-9,12,15-octadecatrienoic) acid – C18:3
9c12c15c, by gas–liquid chromatography. The measurements were carried out at temperatures from
(303.13 to 368.19) K and the partial molar excess Gibbs free energy (DGE;11 ), enthalpy (DHE;11 ), and
entropy (DSE;11 ), at infinite dilution were calculated from experimental c113 values obtained over the tem-
perature range. The uncertainties in determination of c113 and DHE;11 are 4% and 20%, respectively. The results for stearic acid obtained in this study have been compared to those available in the Dortmund Data Bank (DDB). The real behaviour of fatty systems could be better understood through the results obtained in this work |
|---|