Please use this identifier to cite or link to this item:
Title: Thermodynamic study of (alkyl esters plus alpha,omega-alkyl dihalides) IV: H-m(E) and V-m(E) for 25 binary mixtures - {xC(u-1)H(2u-1)CO(2)CH(3) + (1-x)alpha,omega-BrCH2(CH2)(v-2)CH2Br}, where u=1 to 5, alpha=1 and v = omega=2 to 6
Authors: Ortega, J. 
Navas, A.
Plácido, J.
Keywords: Excess-Enthalpies
Issue Date: 2007
Publisher: 0021-9614
Journal: Journal of Chemical Thermodynamics 
Abstract: Excess molar enthalpies HmE and excess molar volumes VmE have been determined experimentally at atmospheric pressure and at a temperature of 298.15 K, for a set of 25 binary mixtures composed of the first five methyl esters (methanoate to pentanoate) with five 1,ω-dibromoalkanes (1,2-dibromoethane to 1,6-dibromohexane). Most of the mixtures present positive net mixing effects, endothermic with dilatation, with the exception of those that contain butanoates and pentanoates with the shorter α,ω-dibromoalkanes, which present negative HmE values and, by contrast, negative VmE values when ω ≥ 5, but in both cases at high methyl ester compositions. The experimental data are correlated with a suitable polynomial equation, used previously by our group. Two known versions of the UNIFAC group contribution model are used, the original version by Dang and Tassios and the more recent version of Gmehling et al. The estimations are unacceptable in both cases, so the parameters corresponding to carboxylate/bromine interaction are recalculated for the former version, differentiating the interaction type according to ester acid chain. There is a marked improvement for the methanoate and ethanoate mixtures, although the estimations are not acceptable for the other esters. The second version of UNIFAC, by Gmehling et al., requires other data not available in the literature. © 2006 Elsevier Ltd. All rights reserved.
ISSN: 0021-9614
DOI: 10.1016/j.jct.2006.05.004
Source: Journal Of Chemical Thermodynamics[ISSN 0021-9614],v. 39 (1), p. 128-141
Appears in Collections:Artículos
Show full item record


checked on May 19, 2024


checked on Feb 25, 2024

Page view(s)

checked on Apr 27, 2024

Google ScholarTM




Export metadata

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