The
compressed liquid densities of binary mixtures of 1-butanol
and diethylene glycol dimethyl ether (diglyme) have been measured
over the temperature range from (283 to 363) K and at pressures up
to 100 MPa covering the whole mole fraction of x
1‑butanol = (0, 0.3116, 0.5469, 0.7308, 0.8787, 1).
The measurements
were carried out using a high-pressure vibrating-tube densimeter with
the combined expanded uncertainty (k = 2) of 0.6
kg·m–3. The experimental data were correlated
using the modified Tait equation with an absolute average percentage
deviation lower than 0.015% for each composition of the mixtures.