Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/52097
Title: Thermodynamic study of (alkyl esters + α,ω-alkyl dihalides) VI. Hm E and Vm E for 20 binary mixtures {xCu-1H2u-1CO 2(CH2)3CH3 + (1 - x)α,ω-BrCH2(CH2)v -2CH2Br} to 6
Authors: Navas, A.
Ortega, J. 
de la Nuez, I.
Keywords: Unifac Model
Parameter
Issue Date: 2009
Publisher: 0021-9614
Journal: Journal of Chemical Thermodynamics 
Abstract: This work shows the experimental values obtained for HmE and VmE at the temperature of 298.15 K and atmospheric pressure, for a set of 20 binary mixtures comprised of the first four butyl esters (methanoate to butanoate) with five α,ω-dibromoalkanes (1,2-dibromoethane to 1,6-dibromohexane). The HmE are endothermic for mixtures with butyl methanoate, while for the other esters the HmE adopt a sigmoidal shape. The VmE are positive for mixtures with low molecular weight dibromoalkanes, becoming negative with contractive effects in the final mixture, as the dihalide chain increases. The results indicate that the mixtures present specific interactions, with simultaneous expansion/contraction and exothermic/endothermic effects, and an explanation is given for the different types of interaction taking place. Experimental data are correlated with a polynomial equation used in previous works with satisfactory results. Modelling of the experimental results of the mixtures is carried out on the HmE values, giving rise to an adequate definition of the different interactions taking place. Two versions of the UNIFAC method were used, and for Dang and Tassios' version different possibilities were considered for the interaction parameters of the ester (G)/dibromide (G′). The best estimations were obtained when the pair of interaction parameters, type aG / G′, depended on the number of carbon atoms in the compounds constituting the mixture. © 2009 Elsevier Ltd. All rights reserved.
URI: http://hdl.handle.net/10553/52097
ISSN: 0021-9614
DOI: 10.1016/j.jct.2009.05.006
Source: Journal Of Chemical Thermodynamics[ISSN 0021-9614],v. 41 (11), p. 1222-1231
Appears in Collections:Artículos
Show full item record

SCOPUSTM   
Citations

3
checked on Oct 6, 2024

WEB OF SCIENCETM
Citations

3
checked on Oct 6, 2024

Page view(s)

74
checked on Aug 31, 2024

Google ScholarTM

Check

Altmetric


Share



Export metadata



Items in accedaCRIS are protected by copyright, with all rights reserved, unless otherwise indicated.