(Vapour+liquid) equilibrium in (N,N-dimethylacetamide+methanol+water) at the temperature 313.15 K

(Vapour+liquid) equilibrium in (N,N-dimethylacetamide+ethanol+water) at the temperature 313.15K

“…Inspection of figure 1 suggests dependence between the size of the amide molecule and value of the dimensionless excess Gibbs free energy of mixing, Q. In the previous paper [1], we find roughly linear relation between Q and molar volume of amide, V mol , for (amide + water) and (amide + methanol) mixtures. A similar relation for (amide + ethanol) mixtures can be observed in figure 2.…”

“…Including our previously obtained results (see reference [1] and references given therein), the following two conclusions can be derived. First, we find (table 5) dependence between the term describing ternary interactions, G E ter , and the molar volume of amide, V mol , observed for all the ternary TABLE 4 Parameters C i of equation (1), K i of equation (3), their standard deviations, dC i , dK i , and standard deviations in pressure, dp and dp/p for investigated mixtures (N,N-Dimethylacetamide + ethanol) at T = 313.15 K, N = 4, nobs = 17 C 1 = À0.757164 C 2 = 0.125506 C 3 = 0.011432 C 4 = 0.015174 dC 1 = 0.003773 dC 2 = 0.004693 dC 3 = 0.007349 dC 4 = 0.008731 dp = 0.010 kPa dp/p = 0.23 (N,N-Dimethylacetamide + ethanol + water) at T = 313.15 K Values predicted immediately from binary data (equation (2) only, without extra ternary term) dp = 0.355 kPa dp/p = 5.01…”

“…It should be noted here, as it can be seen in table 1, a large discrepancy between the vapour pressure of pure N,N-dimethylacetamide reported from various sources is observed, which is unexpected. This discrepancy has been discussed in details in the previous work [1].…”

“…The (DMA + water) and (ethanol + water) binary systems at T = 313.15 K were described previously, in references [1,5], n, and therefore these data are not reported here. Binary results for (DMA + ethanol) at T = 313.15 K (table 2) were correlated using the familiar Redlich-Kister equation [13] …”

“…References to the previous results, describing the thermodynamic properties of other amides are given in our previous paper [1].…”