D.P is data points. T and P were temperature and pressure, respectively.
This model was compared with some other corresponding methods from
literatures and the results were listed in Table 2. Based on GCM,
Barati-Harooni et al.51 constructed a model to predict
the density of ILs at variable temperature with AARD of 0.98 %.
Lazzús52 and Chen et al.16 have made
a good prediction for the density of ILs, in which the AARD value
is about 0.73 % and 0.49 %. For the QSPR model of
Lazzús53, a moderate prediction result is obtained
(AARD =2 %). Obviously, the statistical results of these models
are good. Although the AARD (0.48 %) andR 2 (0.9966) of this work are slightly worse
than those of prior studies,54 the amount of ILs
datasets in this paper is the larger. At the same time, a large number
of ILs datasets with different structures are used for modeling in our
work, and the satisfactory prediction results further confirm the
robustness and reliability of the ρ (T, P ) model.