The solubility of CO2 in (hexane + cyclohexane) and (cyclopentane + ethylbenzene) and (toluene + undecane) systems at high pressures

[Display omitted] •Measurements and modeling of CO2 solubility in three binary hydrocarbon mixtures.•The solubility measurements were undertaken in the designed apparatus.•The more ratios of high-carbon hydrocarbon, the lower solubility of CO2 is.•PR and PSRK were using with an AARD% of 2.54%–5.66% and 1.45%–7.66%, respectively. In this work, the solubility of CO2 in three binary hydrocarbon mixtures of different molecular structures, hexane + cyclohexane, cyclopentane + ethylbenzene and toluene + undecane at 313.15 K, 343.15 K, 373.15 K and pressures up to 13.83 MPa were measured. The solubility measurements were undertaken in the designed apparatus. The experimental results show that the solubilities of CO2 in the binary hydrocarbon mixtures are mainly affected by the molecular structure and carbon numbers of hydrocarbon. The more ratios of high-carbon hydrocarbon in the mixtures, the lower solubility of CO2 is. The experimental data were compared with the calculated results of PR and PSRK models. The average absolute relative deviations of bubble pressure were 2.54%–5.66% and 1.45%–7.66%, respectively. Both models gave satisfied results, while the PR was superior to PSRK when the interaction parameters of the relevant systems were provided. PRSK model can calculate the solubility data better near the critical region.