Thermodynamic properties of biofuels: Heat capacities of binary mixtures containing ethanol and hydrocarbons up to 20 MPa and the pure compounds using a new flow calorimeter

Heat capacities are of great significance in the design of new processes and the improvement of existing ones in R&D in production plants as well as the adaptation of new products, in this case, biofuels to their use in a variety of engines and technical devices. An automated flow calorimeter has been developed for the accurate measurement of isobaric heat capacities for pure compounds and mixtures over the range (250 to 400) K and (0 to 20) MPa. In this paper, isobaric heat capacities for heptane, ethanol and the binary mixtures of ethanol with heptane and toluene are reported.

► Isobaric heat capacities for heptane, ethanol, and the mixtures of ethanol with heptane and toluene are reported. ► They have been measured at 5 pressures over the range (0 to 20) MPa. ► An automated flow calorimeter has been developed for the measurements. ► The experimental data are fitted to Redlich–Kister equations. ► Excess isobaric heat capacities are calculated.