Heats of mixing of normal alcohols at 25.deg.

Abstract

Heats of mixing of 10 binary normal alcohol systems were measured at 25°C. in an isothermal dilution calorimeter. The results are correlated with previously published data for 11 other similar systems.E RESULTS of calorimetric measurements of the excess enthalpies at 25°C. for the 10 binary normal alcohol systems formed from methanol (MeOH), ethanol (EtOH), propanol (PrOH), hexanol (HxOH), and decanol (DeOH) are reported. The work is an extension of a previous investigation in which binary normal alcohol systems formed by mixing a component from the above set with either butanol (BuOH) or octanol (OcOH) were examined (3). EXPERIMENTALThe heats of mixing were measured in an isothermally jacketed continuous dilution calorimeter similar in design to that of Savini, Winterhalter, Kovach, and Van Ness

Protonic Ammonium Nitrate Ionic Liquids and Their Mixtures: Insights into Their Thermophysical Behavior

“…This result contrasts with a smaller increase for the system {[N 0 2 2 2 ] x [N 0 0 0 2 ] (1‑ x ) }­[NO 3 ] atoms in the cation of the ionic liquid, these results prove that there are some structural features that are playing an important rôle in the distinct behaviors of the studied systems. It has been demonstrated that excess properties are prone to increase with the difference of the aliphatic chain length between two components . More recently, such a trend was also confirmed for the excess molar volume in binary mixtures of ionic liquids. , Moreover, the excess volumes in binary mixtures of ionic liquids are usually below 1 cm 3 mol –1 .…”

“…It has been demonstrated that excess properties are prone to increase with the difference of the aliphatic chain length between two components. 23 More recently, such a trend However, more intriguingly, this increment is much smaller when increasing the number of ethyl groups within the cation for more highly substituted systems. Thus, for [N 0 2 2 2 ][NO 3 ] and [N 2 2 2 2 ][NO 3 ], the steric hindrance at the central nitrogen atom significantly increases with the addition of the fourth ethyl group.…”

Dielectric Relaxation Time and Relaxation Time Distribution of Alcohol−Water Mixtures

“…Although alcohol is the most popular material employed to study the hydrogen-bonding molecular liquids, it has been investigated systematically only for a few different alcohols. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] In the present work, dielectric measurements of the mixtures of water and alcohol with 22 aliphatic alcohols were carried out in order to clarify the universal rules in dielectric relaxation time and the shape of the dielectric loss of alcohol-water mixtures.…”

110th Anniversary: A Case Study on Developing Accurate and Reliable Excess Gibbs Energy Correlations for Industrial Application

“…The standard deviation for the enthalpy of mixing (σ HE ) is typically assumed to be 2% of the highest absolute value of the enthalpy of mixing. 40 Kurihara, Nakamichi, Kojima; 41 Arce, Martinez-Ageitos, Rodil, Soto; 42 Alvarez et al 43 Pflug, Pope, Benson 44 methanol + propanol Patlasov et al; 45 Gultekin 46 Pflug, Pope, Benson; 44 Khurma, Fenby 47 methanol + isopropanol Ballard, Van Winkle; 48 Ochi, Kojima 49 Verhoeye, Deschepper; 50 Wisniak, Tamir; 51 Geltekin; 46 Lencka, Persson 52 Taylor, Bertrand; 53 Nan, Hou, Yu 54 methanol + butanol Kay, Donham; 55 60 Ochi, Kojima; 62 Pavlicek et al 63 Pflug, Pope, Benson 44 ethanol + isopropanol Ballard, Van Winkle; 64 Kojima et al, 65 Zielkiewicz; 66 Li et al 67 Nagata et al 68 ethanol + butanol Brunjes, Bogart; 69 Hellwig, Van Winkle; 70 Kharin et al 71 Pope et al 59…”

“…On the basis of the comparisons with the activity coefficients of methanol with the other lower alcohols considered here, we concluded that the Kur-1993 41 data are most accurate and the Arc-1998 42 data are sufficiently accurate. The methanol + ethanol correlation was developed based upon the Kur-1993 41 and Arc-1998 42 VLE data, and the Pflug, Pope, and Benson 44 enthalpy of mixing data.…”