(222c) Densities, Speed of Sound and Derived Properties of the Binary Systems (Furfuryl Alcohol + Ethanol), (Furfuryl Alcohol + Toluene), Or (Ethanol + 1, 3-Propanediol) Binary Mixtures At Several Temperatures and Atmospheric Pressure

With the steadily increasing energy consumption contributing to the depletion of fossil resources, the insecurity of energy supply and global warming, renewable energy resources emitting less CO₂ become popular alternatives to substitute fossil fuels, especially in the transportation sector which is responsible for a large part of the global CO₂ emissions.

Among many energy alternatives, biofuels, hydrogen, natural gas and syngas may likely emerge as the four strategically important sustainable fuel sources in the foreseeable future. Within these four, biofuels are the most environment friendly energy source. Hence, biofuels are being explored to replace fossil fuels. They are favorable choice of fuel consumption due to their renewability, biodegradability and generating acceptable quality exhaust gases. Biofuels are referred to liquid, gas and solid fuels predominantly produced from biomass. A variety of fuels can be produced from biomass such as ethanol, methanol, biodiesel, Fischer-Tropsch diesel, hydrogen and methane.

The present work is a continuation of a research program concerning the investigation of the thermodynamic properties of binary mixtures containing solvents derived from biomass.

In this paper, we report the experimental densities and speed of sound for three binary mixtures: (furfuryl alcohol + ethanol), (furfuryl alcohol + toluene), or (ethanol + 1,3-propanediol) measured with an Anton Paar DSA 5000 M vibrating U-tube densimeter and sound analyzer with a certified precision of ±1.10^-6 g.cm^-3 and ±0.1 m.s^-1, respectively. The measurements have been performed for different compositions including the pure compounds at seven temperatures from (283.15 K to 343.15 K) and atmospheric pressure. Excess molar volumes and deviations in isentropic compressibility for the binary systems at the above-mentioned temperatures were calculated. These results were fitted to the Redlich−Kister equation to determine the fitting parameters and the root-mean-square deviations.