In all studies performed, the DES mixtures of the test set were presented in the training. The results were filtered by eliminating pressures and temperatures not seen in the model. The final test proportion for the upper and lower extrapolation were 32.23% and 39.17%, respectively. Figure shows the lower extrapolation results. Even after filtering the data, a low accuracy is achieved at closer molar ratios. The solubilities predicted at higher molar ratios exhibited high errors, which was caused because some pressure values were also excluded from the training set. The lack of pressure information in both extrapolation studies restricted the model learning capability. For the interpolation, a final test size of 13.89% was obtained. The molar ratio range goes from 5 to 10, and the resulting metrics of this model are better compared with those obtained in Figures and. Despite the model high correlation, the molar ratios between 7 and 8 exhibited high error, which are also attributed to pressure values not seen during the training phase. This analysis suggests that pressure is a more critical factor than the molar ratio of the HBD in the DES mixture.