Partial molar volumes of organic solutes in water. XVII: 3-Pentanone(aq) and 2,4-pentanedione(aq) at T=(298 to 573)K and at pressures up to 30MPa

Partial molar volumes of organic solutes in water. XVIII: Selected polyethers(aq) and 3,6-dioxa-1-heptanol(aq) at T= (298 to 573) K and at pressures up to 30 MPa

“…Isothermal compressibility decreases with increasing hydrophilic character of the solute molecule; isothermal compressibility of all diethers is nearly identical even at high temperatures while Values evaluated for pressure close to saturation pressure of water and 30 MPa are plotted for each solute. , 2,5-dioxahexane; , 3,5-dioxaheptane; h, 3,6-dioxaoctane; n, 2,5,8-trioxanonane; m, 3,6-dioxa-1-heptanol; ·, 3-pentanone [6]; +, 2,4-pentanedione [6]. Full line represents the average dependence observed for alcohols [23].…”

“…pressures close to saturation pressure of water and p = 30 MPa. Values for two ketones [6] are plotted in the figure, as well. The dependence follows closely the curve observed for monohydric and polyhydric aliphatic alcohols [23] (full line in the figure).…”

“…A study of aliphatic hydroxy derivatives has been completed: data for all monohydric alcohols derived from alkanes from methane through butane [1,2], selected polyhydric alcohols derived from ethane and propane [3], n-butane [4], and n-pentane, 2,2-dimethylpropane, and nhexane [5] have been published. Recently, new data for two ketones [6] derived from n-pentane (3-pentanone, 2,4-pentanedione) have been published. This paper extends the previous study of aliphatic oxygenated derivatives with solutes containing two or three ether-type oxygen atoms (-O-) in a molecule.…”

Partial molar volumes of organic solutes in water. XXIII. Cyclic ketones at T= (298 to 573) K and pressures up to 30 MPa

“…While the contribution of the methylene group is close to that obtained for cyclic ethers [4], covolume and contribution of the carbonyl group differs significantly from those obtained for cyclic ethers [4] (covolume) and for linear ketones (carbonyl group). The contribution of the carbonyl group in linear ketones shown in figure 3a was obtained from a group contribution procedure using experimental data for pentane-3-one and pentane-2,4-dione [13], several linear ethers [14], and aliphatic alcohols (list of sources is presented in reference [15]). Figure 3b and c shows derivatives of contributions with respect to temperature and pressure: plots of standard molar isobaric expansion E 0 p;m ¼ ð@V 0 m =@TÞ p (figure 3b) and standard molar isothermal compression K 0 T;m ¼ Àð@V 0 m =@pÞ T (figure 3c) at low pressures as functions of temperature.…”

“…Hydroxyl groups of the enol form would result in increased hydrophilic character and thus in lower standard molar volume. [4], dotted line is the contribution of carbonyl group obtained for linear ketones (see reference [13] and the text) FIGURE 4. Plots of (a) contributions in equation (7), (b) standard partial molar isobaric expansion, and (c) standard molar isothermal compression of contributions in equation (7) calculated from the fits using equation (3) at low pressures against temperature.…”