Density and Viscosity Measurements of Binary Alkanol Mixtures from (293.15 to 333.15) K at Atmospheric Pressure F. Kermanpour,* H. Z. Niakan, and T. Sharifi Department of Chemistry, BuAli Sina University, Hamadan 65178-38695, Iran ABSTRACT: Density and viscosity of binary mixtures of {x 1 isobutanol + x 2 1-propanol}, {x 1 isobutanol + x 2 2-propanol}, and {x 1 3-amino-1-propanol + x 2 1-propanol} were measured over the entire composition range and from temperatures (293.15 to 333.15) K at ambient pressure. The excess molar volumes and viscosity deviations were calculated and correlated by the Redlich-Kister and McAllister equations, respectively. The excess molar volumes are negative over the entire mole fraction range for all of the mixtures and become more negative with increasing temperature. The viscosity deviations of the binary mixtures are negative in the entire composition range and decrease with increasing temperature. ■ INTRODUCTION Alkanols are important compounds in both industry and science. Because the physiochemical properties of alkanols are mainly affected by hydroxyl group, 1 then these properties can be used as input data for evaluating theoretical models related to study the hydrophobic interactions. 2,3 Alkanols can also be used in the synthesis of many other organic compounds. Some industrial applications of alkanols consist of perfumes, cosmetics, paint, varnish, drugs, fuel, explosives, fats, waxes, resin, plastics, rubber, and detergents. 4 Amines, alkanols, and their binary mixtures have found applications as solvent in chemistry and technology. 5 The nature of interactions between amines and alcohols are hydrogen bonding. Hydrogen bonding systems have important roles in chemical, physical, and biological processes and drug synthesis. 1,6 Aminoalcohols are an important class of organic compounds which are used as chiral auxiliaries and ligands. 7-9 One member of these materials is 3-amino-1-propanol which is used as an ice crystallization inhibitor 10 and for remov- ing acidic components carbon dioxide or hydrogen sulfide from gas streams of industrial origin or from polluted atmosphere. 11-13 Mixtures containing oxygenated compounds such as alkanols are also important materials in the oil industry because of their application in enhancing octane number in gasoline as additives and pollution reducing properties. Binary mixtures of alkanols are interesting due to their self-association between like molecules and capability of forming intermolecular hydrogen bonds created between unlike molecules upon mixing. So, the treatment of this class of mixtures could be helpful in examination of theoretical models. In this work, the excess molar volume, V m E , and viscosity deviation, Δη, of some binary alkanol mixtures were presented. We have measu- red densities and viscosities of the binary mixtures {isobutanol + 1-propanol}, {isobutanol + 2-propanol}, and {3-amino-1-propanol + 1-propanol} along with their pure components in the temperature range of (293.15 to 333.15) K. The data were measured over the entire composition range at ambient pressure. For the studied systems, we found no data in the literature. The obtained excess molar volumes and viscosity deviations were correlated by Redlich-Kister 14 and McAllister 15 equations, respectively. They were also discussed via hydrogen bond interactions between component molecules and packing effects, which origins from the structural factors. ■ EXPERIMENTAL SECTION Chemicals. Isobutanol and 3-amino-1-propanol were supplied by Merck Company with purities higher than 99 %, while 1-propanol was prepared by the same Company with purity higher than 99.8 %. 2-Propanol was purchesed by BDH with purity higher than 99.5 %. All the purities are in mass fraction. The materials were degassed just before experiment and have been used without further purification. The densities and viscosities of pure components along with the literature data 16-31 are listed in Table 1. Density Measurements. An Anton-Paar DMA 4500 model vibrating tube densimeter, was used for measuring the densities of pure compounds and binary mixtures. The accuracy in the determining density was estimated to be ± 5·10 -5 g·cm -3 . The temperature in the cell was regulated to ± 0.01 K with solid state thermostat. The apparatus was calibrated once a day with dry air and double- distilled freshly degassed water. 32 Air tight stopper bottles were used for the preparation of the mixtures. The mass of dry bottle was first determined. The less volatile component of the mixture was introduced in the bottle, and the total mass was recorded. Received: August 6, 2012 Accepted: March 23, 2013 Published: April 5, 2013 Article pubs.acs.org/jced © 2013 American Chemical Society 1086 dx.doi.org/10.1021/je3011634 | J. Chem. Eng. Data 2013, 58, 1086-1091