A group contribution method to predict the thermal conductivity λ(T,P) of ionic liquids

•The proposed GCM was applied as a function of the temperature.•The proposed GCM was applied as a function of the pressure.•The molecules were decomposed in the cation and anion parts.

A group contribution method to predict the thermal conductivity of ionic liquids as a function of the temperature and pressure, is present. Thermal conductivity measures the ability of a material to conduct heat. Experimental thermal conductivity data of 41 ionic liquids (400 experimental data points) were used to obtain the proposed group contribution method for ranges of 273–390 K for the temperature, 100–20,000 kPa for the pressure, and 0.1–0.22 W m−1 K−1 for the thermal conductivity. The correlative and extrapolative capability of the proposed model was examined using a testing data set not used during the correlation step. Thus, the total data set was divided in a correlation set with 300 experimental data points, and a validation set with 100 experimental data points. Results show that the proposed group contribution method to predict the thermal conductivity of ionic liquids as a function of the temperature and pressure present a good accuracy with lower deviations such as AARD less than 1.90% and R2 of 0.9879 for the correlation set, and AARD less than 2.33% with R2 of 0.9754 for the prediction set.