Thermodynamic properties of (a propyl ester+ann-alkane). XII. Excess molar enthalpies and excess molar volumes for {x()u()+(1−x)()v} withu=(1to 3), andv=(1to 7)

Thermodynamic properties of (a pentyl ester + an-alkane). XIV. The Hand Vfor (an ester + an-alkane)

“…Both versions of the UNIFAC model yield calculated H E m values which are much higher than the experimental values for (pentyl esters + pentane), with the differences increasing with the ester chain length, as can be clearly seen in figure 4(a) for (pentyl ethanoate + pentane) and in figure 4(b) (pentyl pentanoate + pentane). In nearly all the cases the DISQUAC (5,17) model yields calculated values which are quite similar to the results of the versions of the UNIFAC model, (3,15) of the experimental values will provide clues for adapting the theoretical explanation of the behaviour of the mixtures to fit the experimental findings more closely. (6) using the parameter values obtained in an earlier study.…”

Thermodynamic properties of (a butyl ester + an -alkane). XIII. and for {}, where= 1 to 3 and= 1 to 7

“…Confining our analysis to the 21 mixtures considered here, the results for which are given in tables 2 and 3, written empirically as 3 }, where u = 1 to 3 and v = 1 to 7, it can be seen that an increase in the acid ester chain, that is, an increase in u, brings about a slight decrease in the permanent dipole moment associated with the carboxylate group, for example 6.4 · 10 −30 C · m for u = 1 and 6.0 · 10 −30 C · m for u = 2, resulting in a decrease in the dipole-dipole interactions in both component A and in mixture C, though the effect is more pronounced in the latter because of the greater distance between the permanent (8) , Desphande and Prabhu. (9) H E m and V E m of (a butyl ester + n-alkane) 1031 (10) , Awwad et al ( dipoles associated with the -COO-groups.…”

“…A recent series of studies (1)(2)(3) dealing with binary systems of (an alkyl ester + an n-alkane) have shown that the results of modeling of the mixtures using the UNIFAC, (4,5) DISQUAC, (6) and Nitta et al (7) group-contribution models become less accurate with increasing length of the aliphatic chain R 1 or R 2 in esters of the type R 1 COOR 2 and a To whom correspondence should be addressed (E-mail: jortega@cicei.ulpgc.es). also with increasing molar mass of the n-alkane.…”

Multiproperty Correlation of Experimental Data of the Binaries Propyl Ethanoate + Alkanes (Pentane to Decane). New Experimental Information for Vapor–Liquid Equilibrium and Mixing Properties

“…In this line, studies on methyl 1 and ethyl 2,3 ethanoates have been published, and in this work the properties of mixtures of propyl ethanoate with six alkanes, from pentane to decane, are presented. Specifically 4,5 at two of the indicated temperatures, 298 K and 318 K; isobaric VLE data of propyl ethanoate + (C 7 ,C 9 ) have also been published previously. 6 All of these data will help to verify the behavior and gain a greater understanding of these solutions.…”