Liquid density of biofuel mixtures: 1-Heptanol + heptane system at pressures up to 140 MPa and temperatures from 298.15 K to 393.15 K

• New density data for binary mixtures of 1-heptanol + heptane are reported.
• The pressure and temperature intervals are 0.1–140 MPa and 293.15–393.15 K.
• 954 data points measured at seven compositions were fitted to a Tait-like equation.
• Excess volumes have been calculated from the experimental data.
• The isobaric expansivity and the isothermal compressibility have been derived.

This work reports new experimental density data (954 points) for binary mixtures of 1-heptanol + heptane over the composition range (seven compositions; 0 ⩽ 1-heptanol mole fraction x ⩽ 1), between 298.15 and 393.15 K, and for 23 pressures from 0.1 MPa up to 140 MPa. An Anton Paar vibrating tube densimeter, calibrated with an uncertainty of ±0.7 kg · m−3 was used to perform these measurements. The experimental density data were fitted with a Tait-like equation with low standard deviations. Excess volumes have been calculated from the experimental data. In addition, the isobaric thermal expansivity and the isothermal compressibility have been derived from the Tait-like equation, provided as supplementary material.