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Enhancing oil recovery by injecting CO 2 into the reservoirs is a widely employed technique in the oil industry. The density of solutions is a key property to affect the performance and design of CO 2 -enhanced oil projects. A comprehensive review is presented on the available density data and correlations of the equation of state (EOS) for CO 2 −alkane binary and ternary solutions in this paper. A sufficient set of data is available for CO 2 −alkane binary solutions, especially for CO 2 −decane solutions; however, for the rest of the CO 2 −alkane binary solutions, data of density are limited to a certain range of pressure and temperature at the phaseequilibrium and compressed-liquid states. The data have been used for EOS validations and the development of EOS correlations. Furthermore, data on CO 2 −alkane ternary solutions are limited. The temperatures and pressures in the seven available data sets reach 373.2 K and 19 MPa, respectively, which are limiting the development of EOS correlations. No density data are available for CO 2 −heptadecane/nonadecane binary solutions. From the validations of four selected EOS correlations, viz., Soave−Redlich− Kwong (SRK), Peng−Robinson (PR), Benedict−Webb−Rubin−Starling (BWRS), and perturbed-chain statistical associating fluid theory (PC-SAFT) EOSs, the SRK EOS is recommended for predicting the density of CO 2 −heptane/decane/tetradecane binary solutions. The rank of the correlations is SRK EOS, PC-SAFT EOS, PR EOS, and BWRS EOS.

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